Relevant bibliographies by topics / Ferrite

Academic literature on the topic 'Ferrite'

Author: Grafiati
Published: 4 June 2021
Last updated: 29 July 2024

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Journal articles on the topic "Ferrite"

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Wang, Wen Jie, Qing Jie Jiao, Chong Guang Zang, and Xiang Dong Zhu. "Study on the Absorption Properties of Spinel Type Ferrite Composite Coatings in the Low Frequency." Advanced Materials Research 415-417 (December 2011): 30–34. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.30.

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In the present study magneto-polymer composite coatings are fabricated using nano Zn ferrite, Mn ferrite, Ni ferrite, Zn-Mn ferrite and Zn-Ni ferrite by spraying method. The complex permeabilities, Complex permittivities and microwave absorbing properties within the low frequency of these composites were characterized and investigated. The results showed that the magnetism of the mixed spinel ferrites ( Mn ferrite, Zn-Ni ferrite, Zn-Mn ferrite) are strong but the dielectric properties are weaker, while the magnetism of the normal spinel ferrites (Zn ferrite) is the weakest but provide with a big storage capability of electric energy. The absorbing characteristics of the spinel ferrites are better at 300 kHz-1.5GHz, with minimum absorption of 12.5 dB and the maximum absorption at 480MHz, 1050 MHz and 1400 MHz. The microwave absorbing property of the mixed spinel ferrite Zn-Mn ferrite is best having the RL value being -42.5 dB at 1400GHz.
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Lee, Sang Bae, Se Ho Lee, D. H. Kim, Doug Youn Lee, Yong Keun Lee, Kyoung Nam Kim, and Kwang Mahn Kim. "In Vitro Cytotoxicity of Alginate-Encapsulating Ferrite Particles Using WST-1." Key Engineering Materials 284-286 (April 2005): 815–18. http://dx.doi.org/10.4028/www.scientific.net/kem.284-286.815.

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The purpose of this study was to evaluate the cytotoxicity of alginate-encapsulting ferrite particles in vitro. Various ferrite particles such as Ba-ferrite, Sr-ferrite, Co-ferrite, Co/Ni-ferrite were prepared by sol-gel process. Ferrite particles were encapsulated via calcium alginate process with different alginate contents ranged from 10 to 100 wt%. Mouse-fibroblastic NCTC L-929 cells were cultured in RPMI-1640 medium with 10% fetal bovine serum. The alginate-encapsulating ferrites were extracted in 5 ml of distilled water under pH 6.5 at 121°C for 1 h in accordance with ISO 10993-12. In vitro cytotoxicity was evaluated by WST-1. The results of this study indicated that the alginate-encapsulting ferrite particles affected cell viability by increasing alginate contents. Especially, alginate-encapsulating process were enhanced cell viability of ferrites such as Sr-ferrite, Co/Ni-ferrite, and Ba-Ferrite when alginate content was 10 wt%.
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Jimbo, Shotaro, and Shoichi Nambu. "Three-Dimensional Observation of Upper Bainite in the Initial Stage of Transformation in 0.4 wt%C TRIP Steel." Metals 13, no. 2 (February 10, 2023): 355. http://dx.doi.org/10.3390/met13020355.

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Three-dimensional microstructures of bainitic ferrites and prior austenite grains (PAGs) were observed in the initial stage of upper bainite transformation by using a serial sectioning technique and orientation analysis by electron back scattering diffraction (EBSD). The formation site of the bainitic ferrites was quantitatively evaluated by three-dimensional observation. It was revealed that the bainitic ferrites mainly form at the planes rather than the edges of prior austenite grain boundaries (PAGBs) and form on both sides of the PAGB plane. The effect of the orientation of the PAGs on the formation of the bainitic ferrites was also investigated. The bainitic ferrite has a small misorientation with the bainitic ferrite in the adjacent PAG across the PAGB. It is suggested that the reason for the formation of bainitic ferrite at the planes rather than edges of PAGBs is because it is difficult for bainitic ferrite to have a small misorientation with the bainitic ferrites in adjacent PAGs at edges.
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Soloman, M. A., Philip Kurian, and M. R. Anantharaman. "Dielectric and Mechanical Properties of Rubber Ferrite Composites Containing Barium Ferrite." Progress in Rubber, Plastics and Recycling Technology 18, no. 4 (November 2002): 269–82. http://dx.doi.org/10.1177/147776060201800404.

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The incorporation of various types of ferrites in rubber matrixes leads to the development of rubber ferrite composites (RFC). These RFC have a large number of applications as flexible magnets, high-tech sensors, for telecommunication and radiowave absorbers. Both natural and synthetic rubber has the potential of being value added by the incorporation of ferrites. Applications like microwave absorbers warrant that these composites have an appropriate dielectric strength with the required magnetic property. This can be achieved by synthesizing composites based on natural rubber and ferrites. In this paper we report the synthesis of RFC containing barium ferrite according to a specific recipe and its evaluation of dielectric and mechanical properties.
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Han, Fei, Haicheng Yu, Jeffrey Dessau, and Xianghai Chen. "Novel formation of Ferrite in Ingot of 0Cr17Ni4Cu4Nb Stainless Steel." ChemEngineering 2, no. 3 (September 10, 2018): 44. http://dx.doi.org/10.3390/chemengineering2030044.

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The ferrite body is the origin of crack and corrosion initiation of steels. Distribution and density of ferrite in seven steel ingots were examined by light optical microscopy and computational modeling, in the study, to explore the correlation of ferrite formation to chemical composition and the mushy zone temperature in ingot forming. The central segregation phenomenon in ferrite distribution was observed in all the examined steel specimens, except 0Cr17Ni4Cu4Nb stainless steel. No significant difference was found in the distribution and density of ferrite among zones of the surface, ½ radius, and core in neither the risers nor tails of 0Cr17Ni4Cu4Nb ingots. Additionally, fewer ferrites were found in 0Cr17Ni4Cu4Nb compared to other examined steels. The difference of ferrite formation in 0Cr17Ni4Cu4Nb elicited a debate on the traditional models explicating ferrite formation. Considering the compelling advantages in mechanical strength, plasticity, and corrosion resistance, further investigation on the unusual ferrite formation in 0Cr17Ni4Cu4Nb would help understand the mechanism to improve steel quality. In summary, we observed that ferrite formation in steel was correlated with the mushy zone temperature. The advantages of 0Crl7Ni4Cu4Nb in corrosion resistance and mechanical stability could be the result of fewer ferrites being formed and distributed in a scattered manner in the microstructure of the steel.
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Gao, Fen, Dong Lin Zhao, and Zeng Min Shen. "Preparation and Microwave Absorbing Properties of Cu-Doped Ni-Zn Spinel Ferrites." Advanced Materials Research 105-106 (April 2010): 293–96. http://dx.doi.org/10.4028/www.scientific.net/amr.105-106.293.

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Ni-Zn spinel ferrite and Cu-doped spinel ferrite were prepared by a conventional ceramic processing method. Microwave absorption, complex permittivity and permeability of the (Ni0.5Zn0.5)Fe2O4 and (Ni0.4Cu0.2Zn0.4)Fe2O4 spinel ferrites within the frequency range of 0.5-18 GHz were investigated. The reflection loss calculation results show that the Ni-Zn spinel ferrite and Cu-doped Ni-Zn spinel ferrite are good electromagnetic wave absorbers in the microwave range. The single layer (Ni0.4Cu0.2Zn0.4)Fe2O4 spinel ferrite absorber with a thickness of 9.2 mm achieved a reflection loss below -10 dB (90% absorption) at 0.5-2.3 GHz, and the minimum value is -35.63 dB at 1.1 GHz. When the first layer and second layer are (Ni0.5Zn0.5)Fe2O4 and (Ni0.4Cu0.2Zn0.4)Fe2O4 spinel ferrites respectively, the laminated absorbers with double spinel ferrite layers with a thickness of 3 mm achieved a reflection loss below -10 dB at 9.9-12.3 GHz, and the minimum value is -35.3 dB at 11.7 GHz.
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Torquato, Mattheus, Magno de Assis Verly Heringer, Eliel Gomes da Silva Neto, Emilson Ribeiro Viana Junior, and Ronaldo Sergio de Biasi. "Influence of cerium doping on the magnetic properties of a nanometric cobalt-zinc mixed ferrite." OBSERVATÓRIO DE LA ECONOMÍA LATINOAMERICANA 22, no. 7 (July 9, 2024): e5723. http://dx.doi.org/10.55905/oelv22n7-109.

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This study investigates the influence of cerium doping on the magnetic properties of nanometric-sized particles of a cobalt-zinc mixed ferrite with stoichiometric formula Co0.6Zn0.4Fe2O4. The effect of cerium doping was studied by producing a ferrite with the stoichiometric formula Co0.6Zn0.4Fe1.95Ce0.05O4 and comparing its magnetic properties with those of undoped cobalt-zinc ferrite and other ferrites. The samples were synthesized by sol-gel combustion and characterized by X-ray diffraction (XRD), vibrating-sample magnetometry (VSM) and ferromagnetic resonance (FMR). The XRD results confirm the synthesis of ferrite, the VSM results show that the saturation magnetization decreases with cerium doping and the FMR results show that the magnetocrystalline anisotropy decreases with cerium doping. Comparison with other ferrites suggests that doping with 5% cerium does not significantly decrease the microwave absorption of cobalt-zinc ferrite while protecting healthy cells in hyperthermy.
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de Campos, Marcos Flavio, and Daniel Rodrigues. "High Technology Applications of Barium and Strontium Ferrite Magnets." Materials Science Forum 881 (November 2016): 134–39. http://dx.doi.org/10.4028/www.scientific.net/msf.881.134.

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Ceramic magnets as barium ferrite or strontium ferrite have many applications in high technology. One of the reasons is the low cost when compared to competitor materials, as Alnico, MnBi, MnAl or NdFeB. In this study, the advantages and disadvantages of Ba and Sr ferrite magnets are discussed. One clear advantage is that ferrites are already oxides, and do not present the corrosion problems typical of NdFeB and other metallic alloys. As ferrites are oxides, the processing is much easier and cheaper. For example sintering can be done at air, and milling under wet condition. One of the main conclusions is the excellent ratio cost/benefit of ferrites, giving advantage in many applications. Special attention is given for application of ferrites in high efficiency motors.
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Thomas, Tina, Marius van Dijk, Marc Dreissigacker, Stefan Hoffmann, Hans Walter, Karl-Friedrich Becker, and Martin Schneider-Ramelow. "Ferrites in Transfer-Molded Power SiPs: Challenges in Packaging." Journal of Microelectronics and Electronic Packaging 17, no. 2 (April 1, 2020): 35–44. http://dx.doi.org/10.4071/imaps.1064487.

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Abstract Transfer-molding process is enjoying growing interest when aiming for novel high-power density system-in-packages (power SiPs), where not only transistors and diodes but also drivers, passives, coils, and transformers are supposed to be integrated in one package. Encapsulating modules in a transfer-molding process induces higher mechanical load onto module components compared with conventional silicone potting. Previous investigations have shown that integration of delicate components as ferrite cores into molded packages is not as trivial as integration of conventional surface-mount devices or power semiconductors; the brittle ferrites tend to fracture during the encapsulation process, resulting in higher ferrite core loss. The current study aims to identify main root causes for ferrite core cracking during manufacturing of molded power SiPs. The test vehicle is a symmetrical printed circuit board–based package with three pairs of E-shaped ferrite cores. The epoxy molding compound deployed here is characterized to enable filling simulations. Because technical datasheets of ferrites typically lack specifications of mechanical properties, ferrite materials are analyzed in more detail. Filling simulations and thermomechanical simulations are performed to gain insight into process-induced stress, which may induce cracks in the ferrites. In addition, different ferrite designs are evaluated regarding core losses and mechanical stability and, thus, their tendency to fracture.
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Habib, Shaimaa A., Samia A. Saafan, Talaat M. Meaz, Moustafa A. Darwish, Di Zhou, Mayeen U. Khandaker, Mohammad A. Islam, et al. "Structural, Magnetic, and AC Measurements of Nanoferrites/Graphene Composites." Nanomaterials 12, no. 6 (March 11, 2022): 931. http://dx.doi.org/10.3390/nano12060931.

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As a contribution to the graphene-based nanoferrite composites, this article is intended to present Mn, Co, and Co-Mn nanoferrites for the preparation and investigation of such samples. Nanoparticles of Co ferrite, Mn ferrite, and Co-Mn ferrite were chemically synthesized by the coprecipitation method. The composites of ferrite/graphene were made by incorporating weight ratios of 25% graphene to 75% ferrite. Various structural and characterizing investigations of ferrite samples and ferrite/graphene composites were performed, including XRD, EDX, SEM, VSM hysteresis loops, AC conductivity, and dielectric behavior. The investigations ensured the formation of the intended nanoferrite powders, each having a single-phase crystal structure with no undesired phases or elements. All samples exhibit a soft magnetic behavior. They show a semiconducting behavior of AC electrical conductivity as well. This was proved by the temperature dependence of the AC’s electrical conductivity. Whereas the dielectric function and loss tangent show an expected, well-explained behavior, the ferrite/graphene composite samples have lower saturation magnetization values, lower AC conductivity, and dielectric constant values than the pure ferrites but still have the same behavior trends as those of the pure ferrites. The values obtained may represent steps on developing new materials for expected applications, such as manufacturing supercapacitors and/or improved battery electrodes.
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Dissertations / Theses on the topic "Ferrite"

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Morin, Victor. "Elaboration de composites multiférroïque et caractérisation de l'effet magnétoélectrique." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLN030/document.

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L'effet magnétoélectrique (ME) est la modification de la polarisation électrique par l'application d'un champ magnétique (effet ME direct), ou bien la modification de l'aimantation magnétique par l'action d'un champ électrique (effet ME inverse).L'utilisation de matériaux composites permet de reproduire de manière extrinsèque cet effet. Le couplage mécanique entre des matériaux magnétostrictifs et piézoélectriques fournit un effet ME extrinsèque plus important à température ambiante que celui fournit intrinsèquement. Nous avons dégagé (théoriquement et expérimentalement) différentes caractéristiques de matériaux nécessaires à l'obtention d'un effet ME important et justifé l'utilisation de ferrite et de PZT dans les composites ME. Nous expliquons dans cette thèse, les méthodes de fabrications des différentes géométries de composites étudiées (empilement de couches ou bien inclusions d'une phase dans l'autre). En particulier, l'utilisation du frittage non conventionnel par Spark Plasma Sintering, pour améliorer le couplage mécanique y est abordée. En nous focalisant sur la géométrie en multicouche, nous avons montré l'importance de facteurs tels que le champ démagnétisant ou encore la symétrie de la structure. Nous présentons un prototype de capteur de courant utilisable en génie électrique. Nous en avons montré sa bonne linéarité et sensibilité, mais aussi ses défauts en terme de bande passante
The magnetoelctric (ME) response consists in the modification of the electric polarization by an applied magnetic field (direct effect) or the modification of the magnetic polarization by an applied electric field (inverse effect). Intrinsic multiferroics are rather uncommon and the effect is often weak at room temperature. An alternative route to achieve ME effect, consists in using magnetostrictive and piezoelectric materials and coupling the two phases by mechanical stress. We draw (theoretically and experimentally) some material characteristics to achieve an importantME effect, which justify the use of ferrite and PZT. We describe the production process of the two studied connectivity schemes (stack of layers or inclusion of a phase in another). We focus on the sintering by Spark Plasma Sintering as a potential improvement of the mecanical bonding. We devoted a part of our work on multilayer composite and showed the importance of some factors such as the demagnetizing effect or the symmetry of the structure. We introduce a current sensor prototype suitable for electrical engineering application. We showed its good linearity and sensitivity but also some effects of its bandwidth
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Janasi, Suzilene Real [UNESP]. "Ferrita de bário: preparação de fases dopadas com cobalto, titânio e estanho." Universidade Estadual Paulista (UNESP), 1997. http://hdl.handle.net/11449/102592.

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Made available in DSpace on 2014-06-11T19:32:11Z (GMT). No. of bitstreams: 0 Previous issue date: 1997Bitstream added on 2014-06-13T20:27:17Z : No. of bitstreams: 1 janasi_sr_dr_araiq.pdf: 2566763 bytes, checksum: e10173459cbf62287b0478669d7c6ed0 (MD5)
A substituição parcial de íons Fe3+ por pares de íons (Co2+-Ti4+ ou Co2+-Sn4+) na ferrita de bário hexagonal (BaFe12O19) leva a uma substancial diminuição no campo coercitivo (Hc) com uma pequena mudança na magnetização de saturação (Ms), permitindo seu uso em gravação magnética e magneto-óptica de alta densidade. Os diferentes métodos de preparação de ferritas de bário resultam em produtos com propriedades distintas. Neste trabalho, preparou-se BaFe12-2xCoxTixO19 e BaFe12-2xCoxSnxO19 (0,25 £ x £ 1) por coprecipitação, utilizando cloretos dos metais precursores e solução de KOH/K2CO3 como precipitante. Após a secagem, o produto obtido foi calcinado a 950oC por 3h, lavado e seco. Os difratogramas de raios X indicaram a formação da ferrita de bário. As micrografias eletrônicas de varredura mostraram que os pós obtidos apresentam-se na forma de plaquetas hexagonais de 1 a 2mm. As curvas de magnetização das ferritas de bário dopadas mostraram que o campo coercitivo e a remanência diminuem em função do aumento da razão de substituição x. A curva de magnetização da amostra dopada com Co-Ti, com x = 1 é característica de uma ferrita mole, com Hc = 13,5 kA.m-1 (0,17 kOe), Ms = 46,1 emu.g-1 e Mr = 11,0 emu.g-1. Para a amostra dopada com Co-Sn a diminuição de Mr não é significante. Estes resultados mostraram que as propriedades magnéticas das ferritas de bário dopadas obtidas por coprecipitação foram melhoradas, em relação aos dados da literatura para ferrita de bário pura ou dopada.
The partial substitution of Fe3+ ions with pairs of ions (Co2+-Ti4+ or Co2+-Sn4+) in hexagonal barium ferrite (BaFe12O19) leads to a substantial reduction on coercivity (Hc) with only a low change in saturation magnetization (Ms), allowing its use in high density magnetic and magneto-optical recording. Different preparative methods result in barium ferrites with distinguished properties. In this work, BaFe12-2xCoxTixO19 and BaFe12-2xCoxSnxO19 (0.25 £ x £ 1) were prepared by the coprecipitation method using chloride salt precursors and KOH/K2CO3 solution. After drying, the powder was calcinated at 950oC by 3 h, washed and dried. The X ray diffraction patterns indicated the barium ferrite phase formation. The scanning electron micrographs showed that the particles are hexagonal platelike with diameter size ranging from 1 to 2 mm. The magnetization curves of substituted barium ferrites showed that the values of Hc and Mr decrease with the increase of the substitution ratio x. The magnetization curve profile for Co-Ti substituted sample with x =1 is characteristic of a soft ferrite with Hc = 13.5kA.m-1 (0.17 kOe), Ms = 46.1 emu.g-1 and Mr = 11.0 emu.g-1. These results indicated that the magnetic properties of substituted barium ferrites obtained by coprecipitation were improved when compared with the literature data for pure and substituted barium ferrite.
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Mahhouti, Zakaria. "Synthesis and characterization of functional monodispersed cobalt ferrite nanoparticles." Electronic Thesis or Diss., Amiens, 2019. http://www.theses.fr/2019AMIE0010.

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Dans le présent travail, les nanoparticules monodispersées à base de ferrite de cobalt ont été explorées pour leurs propriétés magnétiques et leur effet magnétostrictif, ainsi que pour une utilisation en tant que ferrofluide. Les nanoparticules ont été dispersées avec succès dans un solvant organique. La chimie de surface de la nanoparticule magnétique s'avère cruciale pour obtenir une dispersion haute densité homogène et bien séparée dans l'hexane. De plus, l'acide oléique a été utilisé pour modifier la surface des nanoparticules de ferrite de cobalt et permettre d'obtenir une bonne dispersion. Les nanoparticules obtenues sont caractérisées par XRD, spectroscopie Raman, TGA, FT-IR, DLS, SEM et la caractérisation magnétique. En utilisant l'analyse STEM, nous avons constaté que la taille et la forme des nanoparticules pouvaient être contrôlées en faisant varier certains paramètres tels que la température de synthèse, la quantité et la nature des réactifs. En outre, des membranes anodiques poreuses à pores très ordonnés ont été fabriquées avec succès avec une anodisation en plusieurs étapes. Des nanorods de ferrite de cobalt ont été produites par la transformation des nanoparticules de CoFe2O4 à l'aide d'une membrane d’alumine poreuses. L'insertion des nanoparticules de CoF2O4 dans les pores des membranes a été étudiée par le microscope électronique à balayage, et il a été possible de suivre le comportement des nanoparticules de CoFe2O4 dans les pores lors de l'insertion ainsi que lors de la transformation
In the present work, monodisperse cobalt ferrite nanoparticle systems have been explored in regard to their magnetic properties and magnetostrictive effect, as well as for use as a ferrofluid. Nanoparticles have been successfully dispersed in an organic solvent. The surface chemistry of the magnetic nanoparticle proves critical to obtaining a homogeneous and well separated high density dispersion in Hexane. In addition, Oleic acid was used to alter the surface of cobalt ferrite nanoparticles and successfully achieve good dispersion. The obtained nanoparticles are characterized using XRD, Raman spectroscopy, TGA, FT-IR, DLS, SEM, and magnetic investigations. Using STEM analysis, we found that the size and shape of nanoparticles could be controlled by varying certain parameters such as the synthesis temperature, the quantity, and nature of reagents. Furthermore, porous anodic membranes with highly ordered pores were successfully fabricated with multi-steps anodizing. Cobalt ferrite nanorods were produced by a transformation of CoFe2O4 nanoparticles using anodic alumina membrane. The insertion of CoF2O4 nanoparticles into the pores of the AAO membranes was studied with a scanning electron microscope, and it was possible to follow the behavior of CoFe2O4 nanoparticles in the pores during the insertion step as well as the transformation step
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Dunn, Daniel S., Matthew S. Telep, and Eugene P. Augustin. "Variable Polarization Ferrite Antenna." International Foundation for Telemetering, 1994. http://hdl.handle.net/10150/611640.

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International Telemetering Conference Proceedings / October 17-20, 1994 / Town & Country Hotel and Conference Center, San Diego, California
This paper describes a ferrite antenna that can produce any polarization on the Poincaré sphere over the frequency range of 9.0 to 11.4 GHz by utilizing Faraday rotation and a quarter-wavelength phase shifter. All possible polarizations of the electromagnetic wave are achievable with this antenna which includes linear, circular and elliptical polarizations. Any tilt angle of elliptical polarization and any orientation of the linear polarization can be achieved as well. The polarization of the ferrite antenna can be electronically switched to a different polarization instantly without the use of moving parts. An automatic data acquisition system was designed and built to fully analyze the antenna' s characteristics.
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Ajroudi, LIlia. "Ferrites de cobalt nanostructurés ; élaboration, caractérisation, propriétés catalytiques, électriques et magnétiques." Thesis, Toulon, 2011. http://www.theses.fr/2011TOUL0017/document.

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Ce travail est consacré à l’élaboration et l’étude des propriétés catalytiques, électriques et magnétiques denanomatériaux à base de ferrite de cobalt. Les nanopoudres de ferrite de cobalt (CoxFe3-xO4 , x=0.6,1,1.2,1.8 ) ont étéélaborées par une nouvelle méthode chimique solvo-thermale. Les nanopoudres obtenues sont très bien cristallisées ontdes tailles de particules qui varient avec le taux de cobalt entre 4 et 7 nm et sont très homogènes en composition. Lesnanopoudres de ferrites de cobalt sont monophasées, de structure spinelle avec un paramètre de maille qui varie enfonction du taux de cobalt. Les nanopoudres de ferrites de cobalt ne s’oxydent pas sous air et en température .Lesnanopoudres de composition proches de x=1 sont stables jusqu’à 900°C, alors que pour de plus forts écarts à lastoechiométrie, des transformations de phase ont lieu au delà de 550°C.Les mesures catalytiques ont mis en évidence l’oxydation de CH4 en CO2 après passage sur le catalyseur pour tous leséchantillons. L’efficacité catalytique est maximale et l’énergie d’activation est la plus faible pour l’échantillon x=1.8 ;ceci est lié à la plus grande surface spécifique, et au plus fort taux de sites actifs pour cette composition.Les ferrites de cobalt élaborées présentent une conduction de type électronique avec un comportement semi conducteurjusqu’à 500-600°C et un comportement métallique au-delà. Les variations de conductivité d’une composition à l’autres’expliquent par les variations du nombre de paires [Co2+,Fe3+].Les nanoparticules ont un comportement superparamagnétique quelle que soit la composition. Ce comportement estdû principalement à un effet de taille et de forme, et à une distribution cationique différente entre les deux types desites tétraédriques et octaédriques de la structure spinelle. Ces ferrites présentent une aimantation à saturation prochede celle de l’état massif, du fait de la grande qualité cristalline attribuée à la méthode d’élaboration mise au point
This work is devoted to the synthesis and the study of the physical properties of cobalt ferrite nanomaterials. Thecobalt ferrite nanopowders (CoxFe3-xO4 , x=0.6,1,1.2,1.8 ) were synthesized by a new solvo thermal chemical route.The nanopowders are highly crystallized, very homogeneous in size and chemical composition. The nanopowderssizes are ranged from 4 nm for high cobalt content to 7 nm for low cobalt content. They are single phased, with thespinel structure, and a cell parameter varying with the cobalt content. The cobalt ferrites do not oxidize, when heatedunder air. For compositions near x=1, the cobalt ferrites are stable when heated under air up to 900°C, as for the othercompositions, phase transformations occur above 550°C.The catalytic measurements have shown the oxidation of CH4 into CO2 in presence of the catalyst for all thecompositions. Cobalt ferrite with composition x=1.8, presents the lowest activation energy and the best catalyticefficiency; this can be related to the great specific surface and the high rate of active sites for this composition.Concerning the conduction properties, the cobalt ferrites exhibit a semiconductor character up to 500-600 ° C and ametallic one above. Changes in conductivity from a composition to another are explained by changes in the number ofpairs [Co2+, Fe3+].A superparamagnetic behaviour was evidenced whatever the composition. This is due for one part to a size and shapeeffect and for the other part to different cationic distribution between tetrahedral and octahedral sites. These ferriteshave a saturation magnetization close to that of the massive state, because of the high crystallinity of the nanopowders,attributed to the synthesis method developed in this work
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Janasi, Suzilene Real. "Ferrita de bário : preparação de fases dopadas com cobalto, titânio e estanho /." Araraquara : [s.n.], 1997. http://hdl.handle.net/11449/102592.

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Banca: Élson Longo
Banca: Carlos de Oliveira Paiva Santos
Resumo: A substituição parcial de íons Fe3+ por pares de íons (Co2+-Ti4+ ou Co2+-Sn4+) na ferrita de bário hexagonal (BaFe12O19) leva a uma substancial diminuição no campo coercitivo (Hc) com uma pequena mudança na magnetização de saturação (Ms), permitindo seu uso em gravação magnética e magneto-óptica de alta densidade. Os diferentes métodos de preparação de ferritas de bário resultam em produtos com propriedades distintas. Neste trabalho, preparou-se BaFe12-2xCoxTixO19 e BaFe12-2xCoxSnxO19 (0,25 £ x £ 1) por coprecipitação, utilizando cloretos dos metais precursores e solução de KOH/K2CO3 como precipitante. Após a secagem, o produto obtido foi calcinado a 950oC por 3h, lavado e seco. Os difratogramas de raios X indicaram a formação da ferrita de bário. As micrografias eletrônicas de varredura mostraram que os pós obtidos apresentam-se na forma de plaquetas hexagonais de 1 a 2mm. As curvas de magnetização das ferritas de bário dopadas mostraram que o campo coercitivo e a remanência diminuem em função do aumento da razão de substituição x. A curva de magnetização da amostra dopada com Co-Ti, com x = 1 é característica de uma ferrita mole, com Hc = 13,5 kA.m-1 (0,17 kOe), Ms = 46,1 emu.g-1 e Mr = 11,0 emu.g-1. Para a amostra dopada com Co-Sn a diminuição de Mr não é significante. Estes resultados mostraram que as propriedades magnéticas das ferritas de bário dopadas obtidas por coprecipitação foram melhoradas, em relação aos dados da literatura para ferrita de bário pura ou dopada.
Abstract: The partial substitution of Fe3+ ions with pairs of ions (Co2+-Ti4+ or Co2+-Sn4+) in hexagonal barium ferrite (BaFe12O19) leads to a substantial reduction on coercivity (Hc) with only a low change in saturation magnetization (Ms), allowing its use in high density magnetic and magneto-optical recording. Different preparative methods result in barium ferrites with distinguished properties. In this work, BaFe12-2xCoxTixO19 and BaFe12-2xCoxSnxO19 (0.25 £ x £ 1) were prepared by the coprecipitation method using chloride salt precursors and KOH/K2CO3 solution. After drying, the powder was calcinated at 950oC by 3 h, washed and dried. The X ray diffraction patterns indicated the barium ferrite phase formation. The scanning electron micrographs showed that the particles are hexagonal platelike with diameter size ranging from 1 to 2 mm. The magnetization curves of substituted barium ferrites showed that the values of Hc and Mr decrease with the increase of the substitution ratio x. The magnetization curve profile for Co-Ti substituted sample with x =1 is characteristic of a soft ferrite with Hc = 13.5kA.m-1 (0.17 kOe), Ms = 46.1 emu.g-1 and Mr = 11.0 emu.g-1. These results indicated that the magnetic properties of substituted barium ferrites obtained by coprecipitation were improved when compared with the literature data for pure and substituted barium ferrite.
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Souza, NatÃlia Dantas Gomes de. "Obtaining magnetic nanobiocompÃsitos consisting of galactomannan, glycerol and nickel ferrite and zinc." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=11766.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior
FundaÃÃo de Amparo à Pesquisa do Estado do CearÃ
Nos Ãltimos anos, um grande interesse na associaÃÃo de materiais magnÃticos e biolÃgicos tem sido relatado na literatura. A obtenÃÃo de novos compÃsitos constituÃdos de galactomanana (GM), nanopartÃculas magnÃticas (MNPs) de NiZn e glicerol (GL) foram produzidos em diferentes proporÃÃes com finalidade de potencializar as caracterÃsticas individuais de cada material para futuras aplicaÃÃes. Sendo assim, as propriedades estruturais, magnÃticas e dielÃtricas dos nanobiocompÃsitos foram investigadas por DifraÃÃo de Raios-X (DRX), Espectroscopia de AbsorÃÃo na RegiÃo de Infravermelho (FTIR), AnÃlise TÃrmica (TG), Calorimetria ExploratÃria Diferencial (DSC), Microscopia EletrÃnica de Varredura (MEV), Microscopia EletrÃnica de TransmissÃo (TEM), Medidas MagnÃticas e Medidas DielÃtricas. A estrutura de espinÃlio da ferrita de NiZn foi confirmada por DRX e TEM e a amostra GMGL apesar de ser um material amorfo apresentou em seus nanobiocompÃsitos picos caracteristicos da fase de NiZn. As bandas caracterÃsticas para as amostras foram confirmadas por FTIR. Estas por sua vez seguiram um perfil de degradaÃÃo de acordo com as quantidades de NiZn incorporados, confirmados nos termogramas de DSC. A caracterizaÃÃo por MEV foi importante para avaliaÃÃo da morfologia. Os resultados das medidas dielÃtricas apresentaram baixas perdas dielÃtricas e das medidas magnÃticas mostraram comportamento magnÃtico para todos os nanobiocompÃsitos. Portanto, os resultados da caracterizaÃÃo dos nanobiocompÃsitos foram satisfatÃrios para possÃveis aplicaÃÃes como biomaterias, dispositivos eletrÃnicos ou em Ãreas afins.
In recent years, a great interest in the association of magnetic and biological materials has been reported in the literature. New composite consisting of galactomannan (GM), magnetic nanoparticles (NPs) of NiZn and glycerol (GL) were produced in different proportions with the purpose of enhancing the individual characteristics of each material for future applications. Thus, the structural, magnetic and dielectric properties of nanobiocomposites were investigated by Absorption Spectroscopy in the Region of Infrared (FTIR), X-Ray Diffraction (XRD), Thermal Analysis (TG), Differential Scanning Calorimetry (DSC), Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Magnetic Measurements and Dielectric Measurements. The structure of spinel NiZn ferrite was confirmed by XRD and TEM. Sample GMGL despite being an amorphous material presented in their nanobiocomposites characteristic peaks of phase NiZn. The characteristic bands in the samples were confirmed by FTIR. These in turn followed a degradation profile in accordance with the amounts of NiZn incorporated, which was confirmed in the DSC thermograms. The characterization by SEM was important to assess the morphology. The results of dielectric measurements showed low dielectric loss and magnetic measurements showed magnetic behavior for all nanobiocomposites. Therefore, the results of the characterization of nanobiocomposites were satisfactory for potential applications as biomaterials, electronic devices or related areas.
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Brachwitz, Kerstin. "Defekt-induzierte Leitungsmechanismen und magnetische Eigenschaften spinellartiger Ferrite." Doctoral thesis, Universitätsbibliothek Leipzig, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-141251.

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Im Rahmen dieser Arbeit wurde der Einfluss von Defekten auf die Eigenschaften von Ferrit-Dünnfilmen untersucht. Die Dünnfilme wurden mit Hilfe von gepulster Laserabscheidung bei verschiedenen Züchtungsparametern hergestellt. Durch Variation der Substrattemperatur und des Sauerstoffpartialdrucks wurden Dünnfilme verschiedener kristalliner Qualität gezüchtet. Diese wurden hinsichtlich ihrer chemischen Komposition mit Hilfe von energie-dispersiver Röntgenspektroskopie und Röntgenphotoelektronenspektroskopie untersucht. Durch Korrelation der Ergebnisse mit Messungen zum zirkularen magnetischen Röntgendichroismus, konnte eine partielle Inversion der Spinellstruktur nachgewiesen werden. Der Grad der Inversion ist höher für geringe Abscheidetemperaturen. Für diese defektreichen Dünnfilme zeigen Röntgenbeugungsuntersuchungen eine geringere kristalline Ordnung der Dünnfilme. Die strukturellen Defekte haben einen maßgeblichen Einfluss auf die elektrischen und magnetischen Eigenschaften der Ferrit-Dünnfilme. So zeigen die Ferrit-Dünnfilme für geringe Züchtungstemperaturen eine erhöhte elektrische Leitfähigkeit, während Dünnfilme, die bei hohen Substrattemperaturen gezüchtet wurden, isolierend sind. Die Temperaturabhängigkeit der elektrischen Leitfähigkeit kann auf thermisch aktivierte Hopping-Leitung oder die Leitung zwischen Clustern, die in einer Matrix eingebettet sind, zurückgeführt werden. Die magnetischen Eigenschaften von Zinkferrit-Dünnfilmen werden maßgeblich durch Defekte in der Spinellstruktur bestimmt, da es nominell in der normalen Spinellstruktur kristallisiert und daher antiferromagnetisch ist. Die partielle Inversion der Eisen- und Zinkionen führt zu Ferrimagnetismus in den Zinkferrit-Dünnfilmen, der mit Hilfe von SQUID-Messungen in dieser Arbeit eingehend untersucht wurde. Durch Korrelation der Ergebnisse der verschiedenen Untersuchungsmethoden konnten Rückschlüsse auf die dominierenden Defekte in den Ferrit-Dünnfilmen geschlossen werden. So sind zum einen Defekte auf atomarer Skala, wie Antisite-Defekte und divalenten Fe-Ionen für die erhöhte elektrische Leitfähigkeit und die größere Magnetisierung der defektreichen Dünnfilme verantwortlich. Zum anderen können ausgedehnte Defekte, im Speziellen Cluster, die in einer amorphen Matrix eingebettet sind, nicht ausgeschlossen werden.
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Queck, Cham Kiong. "Planar ferrite coupled line circulators." Thesis, University of Manchester, 2003. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488295.

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Kirouane, Souad. "Conception et réalisation d'un isolateur coplanaire en bande X pour des applications télécoms." Thesis, Saint-Etienne, 2010. http://www.theses.fr/2010STET4002.

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La minimisation des circuits et la montée en fréquence constituent deux enjeux importants des systèmes de communication du futur. Cela nécessite un haut degré d'intégration, des performances plus élevées à coût réduit. Ce travail a pour objectif la conception et la réalisation de nouveaux isolateurs réalisés sur ligne coplanaire asymétrique à base de deux types de matériaux ferrite : hexaferrite de baryum (BaM) et grenat d’yttrium et de fer (YIG). La première étude, présentée sur une structure coplanaire à couche de BaM, a été effectuée pour montrer la faisabilité d’un isolateur à déplacement de champ dans la bande 40-50 GHz. La seconde a utilisé le YIG saturé pour des applications autour de 10 GHz. La nouvelle structure d’isolateur utilise le phénomène physique de déplacement de champ lorsqu’elle est polarisée par un champmagnétique continu. Elle est constituée d’une ligne coplanaire asymétrique gravée sur une couche ou un substrat magnétique et d’un demi-plan de masse arrière. Plusieurs séries de prototypes ont été fabriquées puis caractérisées à partir d’un banc de mesure hyperfréquence composé d’un testeur sous pointes à trois accès et d’un analyseur vectoriel de réseaux. Les résultats expérimentaux sont très encourageants car nous obtenons des pertes d’insertion faibles, dans le meilleur des cas inférieures à 1 dB et une isolation de plus de 16 dB
The minimization of circuits and the increasing frequency are two important issues of future communication systems. That requires a high degree of integration, higher performance at reduced cost. This work aims to design and implementation of new isolators on coplanar line based on two types of ferrite materials: barium hexaferrite (BaM) and garnet and yttrium iron (YIG). The first study presented on a planar layer of BaM leads to the feasibility of the isolator of field displacement in the 40-50 GHz band. The second one concerns the use of saturated YIG for applications around 10 GHz. The magnetic field displacement phenomenon appears when the magnetic substrate is polarized by a D.C. magnetic field. The new isolator structure is made from an asymmetric coplanar line put on a layer or magnetic substrate with a half ground plane placed under this substrate. Several sets of prototypes are fabricated and characterized from a measurement bench which is composed by a microwave prober and a vector network analyzer. The experimental results are very promising because low insertion loss (less than 1 dB) and isolation (over 16 dB) have been obtained
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Books on the topic "Ferrite"

1

B, Viswanathan, and Murthy V. R. K, eds. Ferrite materials: Science and technology. Berlin: Springer, 1990.

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Mhmed, F. A. Ferrite grain coarsening. Manchester: UMIST, 1997.

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Goldman, Alex. Modern ferrite technology. New York: Van Nostrand Reinhold, 1990.

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Miyoshi, Kazuhisa. Effect of crystallographical and geometrical changes of a ferrite head on magnetic signals during the sliding process with magnetic tape. [Washington, DC]: National Aeronautics and Space Administration, 1986.

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Jadhav, Vijaykumar V., Rajaram S. Mane, and Pritamkumar V. Shinde. Bismuth-Ferrite-Based Electrochemical Supercapacitors. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-16718-9.

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Teoh, C. S. Ferrite-coupled planar microwave devices. Manchester: UMIST, 1996.

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Basabe, Jacqueline. Gel-processing of strontium ferrite. Manchester: University of Manchester, 1993.

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Helszajn, J. Ferrite phase shifters and control devices. Maidenhead: McGraw-Hill, 1988.

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Helszajn, J. Ferrite phase shifters and control devices. London: McGraw-Hill, 1989.

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1955-, Mantese Joseph Vito, Baker-Jarvis James, and National Institute of Standards and Technology (U.S.), eds. Effective medium theory for ferrite-loaded materials. Boulder, Colo: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1994.

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Book chapters on the topic "Ferrite"

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Weik, Martin H. "ferrite." In Computer Science and Communications Dictionary, 579. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_6878.

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Gooch, Jan W. "Ferrite." In Encyclopedic Dictionary of Polymers, 299. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_4844.

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Owyang, Gilbert H. "Ferrite Devices." In Foundations for Microwave Circuits, 398–497. New York, NY: Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4613-8893-7_8.

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Gooch, Jan W. "Barium Ferrite." In Encyclopedic Dictionary of Polymers, 66. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_1063.

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Weik, Martin H. "ferrite switch." In Computer Science and Communications Dictionary, 579. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_6879.

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Goldman, Alex. "Ferrite Processing." In Handbook of Modern Ferromagnetic Materials, 305–60. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4917-8_14.

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Gooch, Jan W. "Ferrite Yellow." In Encyclopedic Dictionary of Polymers, 299. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_4845.

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Gooch, Jan W. "Hard Ferrite." In Encyclopedic Dictionary of Polymers, 357. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_5790.

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Bhadeshia, Harshad K. D. H. "Widmanstätten ferrite." In Theory of Transformations in Steels, 349–80. Boca Raton : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9781003056782-7.

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Salunkhe, Ashwini B., Maithili V. Londhe, and Vishwajeet M. Khot. "Ferrite- and Non-ferrite-Based Superparamagnetic Materials." In Superparamagnetic Materials for Cancer Medicine, 57–72. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-37287-2_3.

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Conference papers on the topic "Ferrite"

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Gokon, Nobuyuki, Takayuki Mizuno, Shingo Takahashi, and Tatsuya Kodama. "A Two-Step Water Splitting With Ferrite Particles and Its New Reactor Concept Using an Internally Circulating Fludized-Bed." In ASME 2006 International Solar Energy Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/isec2006-99063.

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A thermochemical two-step water splitting cycle using a redox system of iron-based oxides or ferrites is one of the promising processes for converting and storing solar energy into a fuel in sunbelt regions. The ZrO2-supported ferrite (or the ferrite/ZrO2) powders exhibit superior performances on activity and repeatability of the cyclic reactions when compared to conventional unsupported ferrites. In the first step at 1400°C under an inert atmosphere, ferrite on ZrO2 support is thermally decomposed to the reduced phase of wustite that is oxidized back to ferrite on ZrO2 with steam in a separate second step at 1000°C. In this paper, a number of ZrO2-supporetd ferrites, Mn-, Mg-, Co-, Ni- and Co-Mn-ferrites, are examined on activity. The NiFe2O4/ZrO2 powder was found to have a greatest activity between them. This paper also describes a new concept of a windowed solar chemical reactor using an internally circulating fluidized bed of ferrite/ZrO2 particles. In this concept, concentrated solar radiation passes downwards through the transparent window and directly heats the internally circulating fluidized bed. The exploratory experimental studies on this reactor concept are carried out in a laboratory scale for the thermal decomposition of NiFe2O4/ZrO2 particle bed as part of two-step water splitting cycle.
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Sahoo, Subasa C., Baidyanath Sahu, Murtaza Bohra, N. Venkataramani, Shiva Prasad, and R. Krishnan. "Exchange coupled Co-ferrite/Zn-ferrite bilayer." In SOLID STATE PHYSICS: PROCEEDINGS OF THE 57TH DAE SOLID STATE PHYSICS SYMPOSIUM 2012. AIP, 2013. http://dx.doi.org/10.1063/1.4791247.

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Пашков, A. Pashkov, Костишин, V. Kostishin, Исаев, I. Isaev, Читанов, et al. "Obtaining anisotropic hexagonal ferrites for substrates microstrip microwave devices of mm-range of radiation thermal sintering." In XXIV International Conference. Москва: Infra-m, 2016. http://dx.doi.org/10.12737/23265.

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We obtain polycrystalline hexagonal ferrite substrate of subminiature devices microstrip ferrite decoupling short-wave part of the centimeter and millimeter wavelength radiation and thermal sintering. A feature of the manufacture of anisotropic hexagonal ferrite technology radiation-thermal sintering is pressing in a strong magnetic field applied in the direction of compression, which allows target particles and to obtain a material with a high degree of texture, and the use of various compounds and dopants in the manufacturing process, allows you to control electromagnetic and magnetic hexagonal ferrites.
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Yoshiaki, Toda, Yamabe-Mitarai Yoko, Kaseya Akihiko, and Umezawa Osamu. "Improvement in Creep and Steam Oxidation Resistance of Precipitation Strengthened Ferritic Steels." In AM-EPRI 2019, edited by J. Shingledecker and M. Takeyama. ASM International, 2019. http://dx.doi.org/10.31399/asm.cp.am-epri-2019p0096.

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Abstract To save fossil fuel resources and to reduce CO2 emissions, considerable effort has been directed toward researching and developing heat-resistant materials that can help in improving the energy efficiency of thermal power plants by increasing their operational temperature and pressure conditions. Instead of conventional 9-12Cr ferritic heat-resistant steels with a tempered martensitic microstructure, we developed “Precipitation Strengthened 15Cr Ferritic Steel” based on a new material design concept: a solid-solution treated ferrite matrix strengthened by precipitates. Creep tests for 15Cr-1Mo-6W-3Co-V-Nb steels with ferrite matrix strengthened by a mainly Laves phase (Fe2W) showed that the creep strengths of 15Cr ferritic steel at temperatures ranging from 923 K to 1023 K were twice as high as those of conventional 9Cr ferric heat-resistant steel. 15Cr steels have higher steam oxidation resistance than that of conventional steel in the same temperature range as the creep tests. Thus, the new material design concept of heat-resistant steel pro- vides improved creep strength and steam oxidation resistance. We are attempting to determine the optimum compositions, especially that of carbon, in order to improve the high-temperature creep strength.
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Kim, Jong Won, Kyu Sung Sim, Hyun Myung Son, and Kwang Deog Jung. "Thermochemical Hydrogen Production Using Ni-Ferrite and CH4." In ASME 2003 International Solar Energy Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/isec2003-44084.

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Hydrogen production by a 2-step water-splitting thermochemical cycle using metal oxides (ferrites) redox pairs and CH4 have been studied in this experiment. Reactions were performed in a two-step redox cycle in which the ferrites were reacted with CH4 at 700°C–800°C to produce CO, H2, and various reduced phases (reduction step); these were then reoxidized with water vapor to generate H2 in water-splitting step (oxidation step) at 600°C–700°C. The reduced forms of Ni-Fe2O3, Ni-FeO and Ni-Fe alloy from XRD, showed respectively different reactivity for H2 formation from H2O. These were oxidized to the ferrite phase to produce H2 in the water-splitting step at 600°C–700°C. In reduction reaction at 800°C, carbon deposition arise on surface of Ni-ferrite due to CH4 decomposition. This reduced phase containing carbon, which reacts with H2O at 600°C, produce H2, CO, and CO2. The amount of H2 evolved using reduced phase containing carbon was much than that of other phase.
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Kumar, Rajinder, Hitanshu Kumar, Ragini Raj Singh, and P. B. Barman. "Structural analysis of emerging ferrite: Doped nickel zinc ferrite." In ADVANCED MATERIALS AND RADIATION PHYSICS (AMRP-2015): 4th National Conference on Advanced Materials and Radiation Physics. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4929219.

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Sen, Rajarshi, and Sarang Pendharker. "Nonreciprocal Ferrite-Dielectric-Ferrite Waveguide with Unidirectional Power Flow." In 2023 Asia-Pacific Microwave Conference (APMC). IEEE, 2023. http://dx.doi.org/10.1109/apmc57107.2023.10496274.

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Pavlikov, A. Y., S. V. Saikova, D. I. Nemkova, and D. V. Karpov. "THE STUDIES OF STRUCTURAL AND MAGNETIC PROPERTIES OF COPPER FERRITE NANOPARTICLES." In XVI INTERNATIONAL CONFERENCE "METALLURGY OF NON-FERROUS, RARE AND NOBLE METALS" named after corresponding member of the RAS Gennady Leonidovich PASHKOVA. Krasnoyarsk Science and Technology City Hall, 2023. http://dx.doi.org/10.47813/sfu.mnfrpm.2023.318-327.

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Due to their high electrical resistivity and excellent magnetic properties, spinel ferrites are excellent candidates for modern technological applications. Copper ferrite nanoparticles (NPs) are used in biomedicine (drug delivery, magnetic resonance imaging, magnetic cell separation, and DNA extraction). They also have various technological applications such as energy storage devices, magnetic storage media, and spintronic and electromagnetic devices).
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Kodama, Tatsuya, Nobuki Imaizumi, Nobuyuki Gokon, Tsuyoshi Hatamachi, Daiki Aoyagi, and Ken Kondo. "Comparison Studies of Reactivity on Nickel-Ferrite and Cerium-Oxide Redox Materials for Two-Step Thermochemical Water Splitting Below 1400°C." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54277.

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A two-step thermochemical water splitting cycle using a redox system of non-volatile metal oxide is one of the promising processes for converting concentrated solar high-temperature heat into clean hydrogen in sun-belt regions. In the 1st step of the cycle or the thermal reduction step, metal oxide is thermally reduced to release oxygen molecules in an inert gas atmosphere at a higher temperature above 1400°C. In the second step or the water-decomposition step at a lower temperature, the thermally-reduced metal oxide reacts with steam to produce hydrogen. As the reactive redox metal oxide materials to be capable of working below 1400°C, nickel-doped iron oxides or Ni-ferrites supported on zirconia, and non-stoichiometric cerium oxides are the promising working materials. In the present work, a series of the nickel-ferrite redox materials of monoclinic-zirconia-supported, cubic-YSZ(yttrium-stabilized zirconia)-supported, and non-supported Ni-ferries and non-stoichiometric cerium oxide were compared on reactivity for two-step thermochemical water splitting cycle. The monoclinic-zirconia-supported Ni-ferrite produced the most quantity of hydrogen in the repeated cycles when the thermal reduction step was performed for 30 min at 1400°C and the water decomposition step for 60 min at 1000°C.
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Antipova, Y. V., D. V. Karpov, and S. V. Saikova. "STUDY OF PHYSICOCHEMICAL PROPERTIES OF TRANSITION METAL FERRITE (Cu, Mn) NANOPARTICLES OBTAINED BY THERMAL DECOMPOSITION OF OXALATE PRECURSORS." In XVI INTERNATIONAL CONFERENCE "METALLURGY OF NON-FERROUS, RARE AND NOBLE METALS" named after corresponding member of the RAS Gennady Leonidovich PASHKOVA. Krasnoyarsk Science and Technology City Hall, 2023. http://dx.doi.org/10.47813/sfu.mnfrpm.2023.437-446.

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In recent years, much attention has been paid to the study of the properties of magnetic nanomaterials based on ferrites of transition metals. Scientists’ interest in ferrite-based nanoparticles is due to the possibility of their wide application in biomedicine (drug delivery, cancer treatment, as contrasts for magnetic resonance imaging), the creation of magnetic recording devices, the space industry. Ferrites are widely used in the chemical industry, as catalysts.
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Reports on the topic "Ferrite"

1

Hahn H., A. Blednykh, L. Hammons, D. Kayran, and J. Rose. Ferrite Lined Pillbox Cavity. Office of Scientific and Technical Information (OSTI), February 2007. http://dx.doi.org/10.2172/1061860.

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Frey W., Y. Y. Lee, and W. van Asselt. Beam Heating of Ferrite Magnets. Office of Scientific and Technical Information (OSTI), April 1989. http://dx.doi.org/10.2172/1131583.

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ZHAO, Y. A STUDY OF FERRITE CAVITY. Office of Scientific and Technical Information (OSTI), April 2002. http://dx.doi.org/10.2172/794230.

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4

Breitzmann, S. C., S. Y. Lee, and K. Y. Ng. Impedance calculation for ferrite inserts. Office of Scientific and Technical Information (OSTI), January 2005. http://dx.doi.org/10.2172/15020213.

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How, Hoton. Development of Novel Ferrite Antennas. Fort Belvoir, VA: Defense Technical Information Center, March 1993. http://dx.doi.org/10.21236/ada261690.

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Gangwal, S., S. Harkins, J. Stogner, and M. Woods. Multicycle testing of zinc ferrite. Office of Scientific and Technical Information (OSTI), October 1988. http://dx.doi.org/10.2172/6241967.

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Boyd, T. E., M. Y. Price, and R. L. Kochen. Ferrite treatment of actinide waste solutions: chemical interferences in actinide removal by ferrite treatment. Office of Scientific and Technical Information (OSTI), January 1985. http://dx.doi.org/10.2172/6190348.

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Ruud, Clayton O., Pradeep Ramuhalli, Ryan M. Meyer, Aaron A. Diaz, and Michael T. Anderson. CASS Ferrite and Grain Structure Relationship. Office of Scientific and Technical Information (OSTI), July 2016. http://dx.doi.org/10.2172/1328845.

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Coleman, Phillip D., Mark Dudley, and Paul Primm. Ferrite Solutions for Electromagnetic Shock Lines. Office of Scientific and Technical Information (OSTI), September 2014. http://dx.doi.org/10.2172/1172779.

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Yoshii, M., M. Meth, and R. Spitz. THE CAPACITANCE OF FERRITE LOADED CAVITIES. Office of Scientific and Technical Information (OSTI), April 1997. http://dx.doi.org/10.2172/1151369.

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