Relevant bibliographies by topics / SrFe12O19

Academic literature on the topic 'SrFe12O19'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 January 2023

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Journal articles on the topic "SrFe12O19"

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Idayanti, Novrita, Dedi, and Azwar Manaf. "Physical and Magnetic Characterization of Hard/Soft SrFe12O19/CoFe2O4 Nanocomposite Magnets Made by Mechanical Alloying and Ultrasonic Irradiation." Journal of Nano Research 69 (August 30, 2021): 53–66. http://dx.doi.org/10.4028/www.scientific.net/jnanor.69.53.

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In this study, the particle sizes of SrFe12O19 in hard/soft SrFe12O19/CoFe2O4 nanocomposite magnets made using mechanical alloying and ultrasonic irradiation were investigated. SrFe12O19/CoFe2O4 nanocomposites were combined in a ratio of 75:25, with each magnetic material being prepared separately. SrFe12O19 powder was prepared from Fe2O3 and SrCO3 powder by mechanical alloying and ultrasonic irradiation for different times, 0, 3, 6, 9, and 12 h. Varying the ultrasonic time during the preparation of the SrFe12O19 samples resulted in differences in morphological characteristics, crystal structure, particle size, crystal size, microstrain, density, porosity, and magnetic properties. The longer the ultrasonic time, the crystal size and particle size decreases, the density increases, and the porosity reduction which affects the magnetic properties. SrFe12O19 after 12 h ultrasonic process reach Ms value = 61.29 emu/g. CoFe2O4 powder was produced from Fe2O3 and CoCO3 powder by mechanical alloying with a 10 h milling time. Furthermore, each SrFe12O19 sample was composited with CoFe2O4 powder by ultrasonic irradiation for 1 h and these composite samples also showed different characteristics, where there is an increase in Mr and Ms compared to the single SrFe12O19. The morphology, crystal structure, particle size, and magnetic properties of the samples were measured using scanning electron microscopy, X-ray diffraction, particle size analysis, and PERMAGRAPH. The crystal size and microstrain were calculated using a Williamson–Hall plot, and density and porosity were determined using Archimedes’ law.
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Li, Qiao Ling, Cun Rui Zhang, and Yun Ye. "Preparation and Properties Analysis of Polyaniline/Nano-SrFe12O19 Composites with Different Morphologies." Advanced Materials Research 79-82 (August 2009): 1607–10. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1607.

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Polyaniline/nano-SrFe12O19 composites were prepared by in situ polymerization method for the first time. Rod-like and flower-like morphologies composites were synthesized in the phase of an emulsion polymerization system. It was found that the morphology of obtained PANI/nano-SrFe12O19 composites depended on the content of SrFe12O19 of the reaction system. A possible mechanism for the formation of the different morphologic composites had been proposed. The magnetic properties of the PANI/nano- SrFe12O19 composites were inspected by VSM. The possible mechanism for magnetic variation had been proposed in the paper.
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Laayati, Mouhsine, Ayoub Abdelkader Mekkaoui, Lahcen Fkhar, Mustapha Ait Ali, Hafid Anane, Lahoucine Bahsis, Larbi El Firdoussi, and Soufiane El Houssame. "Synergistic effect of GO/SrFe12O19 as magnetic hybrid nanocatalyst for regioselective ring-opening of epoxides with amines under eco-friendly conditions." RSC Advances 12, no. 18 (2022): 11139–54. http://dx.doi.org/10.1039/d2ra00984f.

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Highly efficient magnetically separable hybrid GO/SrFe12O19 nanocomposite was synthesized, as catalyst for epoxide ring-opening, via dispersing M-type strontium hexaferrite (SrFe12O19) on graphene oxide (GO) sheets.
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Liu, Jian An, Mei Mei Zhang, Yan Fei Zhang, and Shu Jiang Liu. "Synthesis and Characterization of Nano-Hexaferrites SrFe12O19 by Aqueous Solution Method." Advanced Materials Research 306-307 (August 2011): 404–9. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.404.

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Nano-hexaferrite SrFe12O19 has been prepared using the aqueous solution method. The structure and magnetic properties of SrFe12O19 have systematically been investigated by X-ray diffraction (XRD), Thermo gravimetric (TG), Fourier transform infrared spectroscopy (FTIR), Transmission Electron Microscopy (TEM), as well as Vibrating Sample Magnetometer (VSM). The XRD and TEM results showed that the samples are composed of SrFe12O19 nano-particles which are on average 70×50nm in dimensions when treated at 1200°C for 2 hours. The magnetic properties indicated that the saturation magnetization and the intrinsic coercivity were 48 Am2/kg and 506KA/m, respectively. The aqueous solution method is generally applicable to produce the nano-hexaferrite SrFe12O19 and is proved to be a promising method for fast synthesis of nanometer materials using nitrate.
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Karahroudi, Zahra Hajian, Kambiz Hedayati, and Mojtaba Goodarzi. "Green synthesis and characterization of hexaferrite strontium-perovskite strontium photocatalyst nanocomposites." Main Group Metal Chemistry 43, no. 1 (April 29, 2020): 26–42. http://dx.doi.org/10.1515/mgmc-2020-0004.

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AbstractThis study presents a preparation of SrFe12O19– SrTiO3 nanocomposite synthesis via the green auto-combustion method. At first, SrFe12O19 nanoparticles were synthesized as a core and then, SrTiO3 nanoparticles were prepared as a shell for it to manufacture SrFe12O19–SrTiO3 nanocomposite. A novel sol-gel auto-combustion green synthesis method has been used with lemon juice as a capping agent. The prepared SrFe12O19–SrTiO3 nanocomposites were characterized by using several techniques to characterize their structural, morphological and magnetic properties. The crystal structures of the nanocomposite were investigated via X-ray diffraction (XRD). The morphology of SrFe12O19– SrTiO3 nanocomposite was studied by using a scanning electron microscope (SEM). The elemental composition of the materials was analyzed by an energy-dispersive X-ray (EDX). Magnetic properties and hysteresis loop of nanopowder were characterized via vibrating sample magnetometer (VSM) in the room temperature. Fourier transform infrared spectroscopy (FTIR) spectra of the samples showed the molecular bands of nanoparticles. Also, the photocatalytic behavior of nanocomposites has been checked by the degradation of azo dyes under irradiation of ultraviolet light.
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Sun, Wei-Feng, and Peng-Bo Sun. "Electrical Insulation and Radar-Wave Absorption Performances of Nanoferrite/Liquid-Silicone-Rubber Composites." International Journal of Molecular Sciences 23, no. 18 (September 9, 2022): 10424. http://dx.doi.org/10.3390/ijms231810424.

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Novel radar-wave absorption nanocomposites are developed by filling the nanoscaled ferrites of strontium ferroxide (SrFe12O19) and carbonyl iron (CIP) individually into the highly flexible liquid silicone rubber (LSR) considered as dielectric matrix. Nanofiller dispersivities in SrFe12O19/LSR and CIP/LSR nanocomposites are characterized by scanning electronic microscopy, and the mechanical properties, electric conductivity, and DC dielectric-breakdown strength are tested to evaluate electrical insulation performances. Radar-wave absorption performances of SrFe12O19/LSR and CIP/LSR nanocomposites are investigated by measuring electromagnetic response characteristics and radar-wave reflectivity, indicating the high radar-wave absorption is dominantly derived from magnetic losses. Compared with pure LSR, the SrFe12O19/LSR and CIP/LSR nanocomposites represent acceptable reductions in mechanical tensile and dielectric-breakdown strengths, while rendering a substantial nonlinearity of electric conductivity under high electric fields. SrFe12O19/LSR nanocomposites provide high radar-wave absorption in the frequency band of 11~18 GHz, achieving a minimum reflection loss of −33 dB at 11 GHz with an effective absorption bandwidth of 10 GHz. In comparison, CIP/LSR nanocomposites realize a minimum reflection loss of −22 dB at 7 GHz and a remarkably larger effective absorption bandwidth of 3.9 GHz in the lower frequency range of 2~8 GHz. Radar-wave transmissions through SrFe12O19/LSR and CIP/LSR nanocomposites in single- and double-layered structures are analyzed with CST electromagnetic-field simulation software to calculate radar reflectivity for various absorbing-layer thicknesses. Dual-layer absorbing structures are modeled by specifying SrFe12O19/LSR and CIP/LSR nanocomposites, respectively, as match and loss layers, which are predicted to acquire a significant improvement in radar-wave absorption when the thicknesses of match and loss layers approach 1.75 mm and 0.25 mm, respectively.
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Zhang, Ze Yang, Xiang Xuan Liu, and You Peng Wu. "Synthesis, Characterization, and Microwave Absorption Properties of SrFe12O19 Ferrites and FeNi3 Nanoplatelets Composites." Advanced Materials Research 148-149 (October 2010): 893–96. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.893.

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M-typical SrFe12O19 ferrites and FeNi3 nanoplatelets were successfully prepared by the sol-gel method and solution phase reduction method, respectively. The crystalline and morphology of particles were studied by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). The composite coatings with SrFe12O19 ferrites and FeNi3 nanoplatelets in polyvinylchloride matrix were prepared. The microwave absorption properties of these coatings were investigated in 2-18GHz frequency range. The results showed that the M-typical SrFe12O19 ferrites and FeNi3 nanoplatelets were obtained and they presented irregular sheet shapes. With the increase of the coating thickness, the absorbing peak value moves to the lower frequency. The absorbing peak values of the wave increase along with the increasing of the content of FeNi3 nanoplatelets filling fraction. When 40% SrFe12O19 ferrites is doped with 20% mass fraction FeNi3 nanoplatelets to prepare composite with 1.5mm thickness, the maximum reflection loss is -24.8 dB at 7.9GHz and the -10 dB bandwidth reaches 3.2GHz.
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Laayati, Mouhsine, Ali Hasnaoui, Nayad Abdallah, Saadia Oubaassine, Lahcen Fkhar, Omar Mounkachi, Soufiane El Houssame, Mustapha Ait Ali, and Larbi El Firdoussi. "M-Type SrFe12O19 Ferrite: An Efficient Catalyst for the Synthesis of Amino Alcohols under Solvent-Free Conditions." Journal of Chemistry 2020 (July 11, 2020): 1–10. http://dx.doi.org/10.1155/2020/7960648.

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Magnetically separable strontium hexaferrite SrFe12O19 was prepared using the chemical coprecipitation method, and the nanostructured material was characterized by X-ray diffraction, scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), and BET analysis. The SEM images showed the homogeneity of the chemical composition of SrFe12O19 and uniform distribution of size and morphology. The pore size of the nanomaterial and its specific area were determined by BET measurements. Strontium hexaferrite SrFe12O19 exhibited a strong magnetic field, which is highly suitable in the heterogeneous catalysis as it can be efficiently separated from the reaction. The magnetic nanocatalyst showed high activity and environmentally benign heterogeneous catalysts for the epoxide ring-opening with amines affording β-amino alcohols under solvent-free conditions. When unsymmetrical epoxides were treated in the presence of aromatics amines, the regioselectivity was influenced by the electronic and steric factors. Total regioselectivity was observed for the reactions performed with aliphatic amines. The magnetically SrFe12O19 nanocatalyst showed excellent recyclability with continuously good catalytic activities after four cycles.
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Guo, Wei, Hang Wu, Zhen Zhong Zheng, Qing Chang Chen, and Qing Guo Chu. "The Research of by Blend and Flux Method SrFe12O19 Magnetic Particle Preparation and Magnetic Properties." Advanced Materials Research 160-162 (November 2010): 1513–17. http://dx.doi.org/10.4028/www.scientific.net/amr.160-162.1513.

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According to the influence of sintering time, sintering temperature, different amount of flux and different molar ratio of Fe / Sr to the magnetic properties of prepared SrFe12O19 magnetic particles, the optimum SrFe12O19 conditions were concluded. They are: sintering time: 3 hours; sintering temperature: 1073.15 k; flux NaCl amount: 15% wt of the reaction raw materials; Fe / Sr molar ratio: 11.4; the sample magnetic properties: Ms = 63.39emu / g; Mr = 33.44emu / g; Hc = 5798Oe, Mr / Ms = 1 : 1.90 ≈ 1:2. The prepared SrFe12O19 should be single crystal particles and in the shape of flake, and the particle size should be generally about 80-90nm with uniform distribution.
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Kubisztal, Marian, Artur Chrobak, Julian Kubisztal, Jozef Stabik, Agnieszka Dybowska, and Grzegorz Haneczok. "Magnetic and Elastic Properties of Nanocomposites Containing Soft (Ni) and Hard (SrFe12O19) Magnetic Particles." Solid State Phenomena 203-204 (June 2013): 310–14. http://dx.doi.org/10.4028/www.scientific.net/ssp.203-204.310.

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In the present paper magnetic and elastic properties of the Ni+SrFe12O19 nanocomposites were examined in detail. Samples were in two forms: i) mechanically pressed cylindrical pellets and ii) filled polymer (amine-epoxy resin) coating on aluminum substrate. The so called apparent Young’s modulus was determined by measurements of the free flexural vibrations frequency by means of vibrating reed technique. Magnetic research was carried out using VSM magnetometer. It was shown that replacement of SrFe12O19 with nano Ni powder results in an increase in material resistivity to elastic deformation. The influence of size reduction of SrFe12O19 powder particles on magnetic parameters of the studied nanocomposites were discussed in detail.
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Dissertations / Theses on the topic "SrFe12O19"

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Nakouri, Kalthoum. "Synthèse et caractérisation de poudres magnétiques pour aimants nanocomposites." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMR098.

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La réalisation d’aimants permanents nanocomposites constitués d’un mélange d’une phase magnétique dure, de coercitivité élevée, et d’une phase magnétique douce, d’aimantation élevée, est une des possibilités d’obtenir de nouveaux matériaux pour aimants permanents sans terres rares. Dans ce travail, le choix s’est porté sur la phase Fe65Co35 comme phase douce et sur la phase SrFe12O19 comme phase dure. Des poudres nanométriques ont été synthétisées par voie chimique, en adaptant des procédés existants. Des nanoparticules Fe65Co35 d’une taille d’environ 10 nm ont été synthétisées par la méthode polyol, en présence de RuCl3 comme agent nucléant. La synthèse de nanoparticules SrFe12O19 a été effectuée par une méthode dite «sol-gel modifiée» mise au point dans le cadre de ce travail. Cette méthode, qui consiste en une calcination dans une matrice de NaCl, a permis d’obtenir des nanoparticules monodomaines bien dispersées et possédant des propriétés magnétiques supérieures à celles obtenues par voie sol-gel classique. L’assemblage des phases dure et douce a été effectué par méthode «in-situ», pour laquelle des nanoparticules de SrFe12O19 sont introduites dans le milieu réactionnel lors de la synthèse des nanoparticules de Fe65Co35. Un couplage d’échange magnétique a été obtenu pour les nanocomposites avec des teneurs de 5% et 10% de phase Fe65Co35
The synthesis of nanocomposite permanent magnets composed of a mixture of a hard magnetic phase, with high coercivity, and of a soft magnetic phase, with high magnetization, is one of the possible paths to obtain new rare earth free permanent magnets materials. In this work, the Fe65Co35 phase has been chosen as the soft phase and the SrFe12O19 phase has been chosen as the hard phase. Nanometric powders have been chemically synthesized, adapting existing processes. Fe65Co35 nanoparticles about 10 nm in size were synthesized by the polyol method, in the presence of RuCl3 as nucleating agent. The synthesis of SrFe12O19 nanoparticles was carried out by a so-called “modified sol-gel” method developed in this work. This method, which consists of calcination in a NaCl matrix, allows obtaining monodomain nanoparticles that are well dispersed and have magnetic properties superior to those obtained by the conventional sol-gel route. The assembly of hard and soft phases was carried out by a so-called "in-situ" method, for which SrFe12O19 nanoparticles are introduced into the reaction medium during the synthesis of the Fe65Co35 nanoparticles. Magnetic exchange coupling was obtained for nanocomposites with 5% and 10% Fe65Co35 phase contents
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Schmidt, Marek Wojciech, and Marek Schmidt@rl ac uk. "Phase formation and structural transformation of strontium ferrite SrFeOx." The Australian National University. Research School of Physical Sciences and Engineering, 2001. http://thesis.anu.edu.au./public/adt-ANU20020708.190055.

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Non-stoichiometric strontium iron oxide is described by an abbreviated formula SrFeOx (2.5 ≤ x ≤ 3.0) exhibits a variety of interesting physical and chemical properties over a broad range of temperatures and in different gaseous environments. The oxide contains a mixture of iron in the trivalent and the rare tetravalent state. The material at elevated temperature is a mixed oxygen conductor and it, or its derivatives,can have practical applications in oxygen conducting devices such as pressure driven oxygen generators, partial oxidation reactors in electrodes for solid oxide fuel cells (SOFC). ¶ This thesis examines the behaviour of the material at ambient and elevated temperatures using a broad spectrum of solid state experimental techniques such as: x-ray and neutron powder diffraction,thermogravimetric and calorimetric methods,scanning electron microscopy and Mossbauer spectroscopy. Changes in the oxide were induced using conventional thermal treatment in various atmospheres as well as mechanical energy (ball milling). The first experimental chapter examines the formation of the ferrite from a mixture of reactants.It describes the chemical reactions and phase transitions that lead to the formation of the oxide. Ball milling of the reactants prior to annealing was found to eliminate transient phases from the reaction route and to increase the kinetics of the reaction at lower temperatures. Examination of the thermodynamics of iron oxide (hematite) used for the reactions led to a new route of synthesis of the ferrite frommagnetite and strontium carbonate.This chapter also explores the possibility of synthesis of the material at room temperature using ball milling. ¶ The ferrite strongly interacts with the gas phase so its behaviour was studied under different pressures of oxygen and in carbon dioxide.The changes in ferrite composition have an equilibrium character and depend on temperature and oxygen concentration in the atmosphere. Variations of the oxygen content x were described as a function of temperature and oxygen partial pressure, the results were used to plot an equilibrium composition diagram. The heat of oxidation was also measured as a function of temperature and oxygen partial pressure. ¶ Interaction of the ferrite with carbon dioxide below a critical temperature causes decomposition of the material to strontium carbonate and SrFe12O19 . The critical temperature depends on the partial pressure of CO2 and above the critical temperature the carbonate and SrFe12O19 are converted back into the ferrite.The resulting SrFe12O19 is very resistant towards carbonation and the thermal carbonation reaction does not lead to a complete decomposition of SrFeOx to hematite and strontium carbonate. ¶ The thermally induced oxidation and carbonation reactions cease at room temperature due to sluggish kinetics however,they can be carried out at ambient temperature using ball milling.The reaction routes for these processes are different from the thermal routes.The mechanical oxidation induces two or more concurrent reactions which lead to samples containing two or more phases. The mechanical carbonation on the other hand produces an unknown metastable iron carbonate and leads a complete decomposition of the ferrite to strontiumcarbonate and hematite. ¶ Thermally and mechanically oxidized samples were studied using Mossbauer spectroscopy. The author proposes a new interpretation of the Sr4Fe4O11 (x=2.75) and Sr8Fe8O23 (x=2.875)spectra.The interpretation is based on the chemistry of the compounds and provides a simpler explanation of the observed absorption lines.The Mossbauer results froma range of compositions revealed the roomtemperature phase behaviour of the ferrite also examined using x-ray diffraction. ¶ The high-temperature crystal structure of the ferrite was examined using neutron powder diffraction.The measurements were done at temperatures up to 1273K in argon and air atmospheres.The former atmosphere protects Sr2Fe2O5 (x=2.5) against oxidation and the measurements in air allowed variation of the composition of the oxide in the range 2.56 ≤ x ≤ 2.81. Sr2Fe2O5 is an antiferromagnet and undergoes phase transitions to the paramagnetic state at 692K and from the orthorhombic to the cubic structure around 1140K.The oxidized formof the ferrite also undergoes a transition to the high-temperature cubic form.The author proposes a new structural model for the cubic phase based on a unit cell with the Fm3c symmetry. The new model allows a description of the high-temperature cubic form of the ferrite as a solid solution of the composition end members.The results were used to draw a phase diagramfor the SrFeOx system. ¶ The last chapter summarizes the findings and suggests directions for further research.
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Hong, Kuang-Yi, and 洪匡奕. "A study of Polyamide/SrFe12O19 magnetic composite materials." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/8d523a.

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碩士
國立臺灣科技大學
材料科學與工程系
104
In this research, We aimed to PA 12、PA 6 were strontium ferrite (SrFe12O19) powder compound with different proportions (80、60、40、20、0wt%),The process of compounding study rheological analysis. Then the final composite magnetic material to the thermal properties analyzes、patterns structural analysis、electromagnetic analysis and cross over to investigate. 　　Frist the powder elements and particle size analysis by X-ray Fluorescent Analyzer(XRF)、X-Ray Diffractometer(XRD) 、Scanning Electron Microscope(SEM).The PA12、PA6 mixed uniformly with strontium ferrite powder and gradually put into quantified using a twin screw micro-compounder (Micro Compounders) by high temperature and shear stress of the twin-screw to a homogeneous blend made magnetic masterbatchs. Then investigating thermal property analysis using Thermogravimetric Analysis(TGA) and Differential Scanning Calorimetry(DSC).X-Ray Diffractometer(XRD) and scanning electron microscopy(SEM) to observe crystallization patterns and compounded homogeneous. Insulation tester、Microwave Dielectrometer and Superconducting QUantum Interference Device(SQUID) investigate electromagnetic properties of the magnetic analysis of the masterbatch.
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Mohseni, Farzin. "Nanostructured rare-earth free permanent magnets." Doctoral thesis, 2021. http://hdl.handle.net/10773/31064.

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In this work we explore on the rare-earth free nanostructured permanent magnets, including thin films, nanoparticles and nanocomposites with the focus on Alnico magnets and hexaferrites. Here we investigate the effects of different heat treatment conditions on structural and magnetic properties of RFsputtered Alnico V thin films on Si substrates. We show an in-depth analysis of the various heat treated samples with high coercivity to unveil the origin of high coercivity in these thin films with a recently discovered Fe-Co rich Body- Centered Tetragonal (bct) phase. Exchange-spring magnets are also explored, namely barium hexaferrite (BaM) and strontium hexaferrite (SrM). We investigate on the possibility of coating BaM and SrM flake-like hexaferrite particles via a hydrothermal and coprecipitation method to prepare core-shelllike BaM/Fe3O4 and SrM/Fe3O4 nanocomposites, where the ferrite particles where prepared via a sol-gel auto-combustion method. We show how optimised hard to soft magnetic phase ratio and preparation conditions lead to a significant enhancement in their hard magnetic properties compared to commercial ferrite powders. Moreover, we employ the prepared highperformance exchange-coupled nanocomposite powder and investigate the mechanical and magnetic properties of warm compressed nanocomposite powder in an epoxy matrix. We show how the powder-to-resin ratio and preparation conditions lead to optimised mechanical properties, and enhancement in the maximum energy product of the composite magnet. Finally, micromagnetic simulations were employed to better understand and support the experimental results of the exchange coupling behaviour of the BaM/Fe3O4 hard-soft magnetic nanocomposites. We show how the thickness of BaM particles affect their coercivity and how the volume fraction of each magnetic phase, together with their interface area, affect the exchange coupling behaviour and maximum energy product of the nanocomposite magnets.
Neste trabalho, exploramos magnetes permanentes nano-estruturados, livres de terras raras, incluíndo filmes finos, nanopartículas e nanocompósitos focando magnetes de Alnico e hexaferrites. Investigamos os efeitos de diferentes condições de tratamento térmico nas propriedades estruturais e magnéticas de filmes finos de Alnico V pulverizados por RF em substratos de Si. Fizemos uma análise mais aprofundada das várias amostras tratadas termicamente para desvendar a origem da alta coercividade nesses filmes finos com uma recentemente descoberta fase Tetragonal Centrada no Corpo (bct) rica em Fe-Co. Os magnetes exchange-spring também são explorados, e.g. hexaferrite de bário (BaM) e hexaferrite de estrôncio (SrM). Investigamos a possibilidade de revestir partículas de hexaferrite semelhantes a flocos de BaM e SrM por meio de métodos hidrotérmico e de coprecipitação para preparar nanocompósitos tipo núcleo-casca de BaM/Fe3O4 e SrM/Fe3O4, onde as partículas de ferrite foram preparadas por meio de método sol-gel de combustão. Mostramos como a relação de fases magnéticas macia e dura, mais as condições de preparação otimizadas, levam a um aprimoramento significativo das suas propriedades magnéticas duras em comparação com pós de ferrite comerciais. Além disso, usando o pó de nanocompósito de alto desempenho, investigamos as propriedades mecânicas e magnéticas do pó do nanocompósito comprimido a quente em uma matriz de epóxi. Mostramos como a combinação pó-resina e as condições de preparação levam à obtenção de propriedades mecânicas otimizadas e a um aprimoramento do produto de energia máxima do magnete composto. Finalmente, realizamos simulações micromagnéticas para melhor compreender e apoiar os resultados experimentais do comportamento de acoplamento de troca dos nanocompósitos magnéticos duros-macios de BaM/Fe3O4. Mostramos como a espessura das partículas BaM afetam a coercividade e como a fração de volume de cada fase magnética, assim como a área de interface entre elas, afetam o comportamento de acoplamento de troca bem como o produto energético máximo dos magnetes de nanocompósitos.
Programa Doutoral em Ciência e Engenharia de Materiais
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Schmidt, Marek Wojciech. "Phase formation and structural transformation of strontium ferrite SrFeOx." Phd thesis, 2001. http://hdl.handle.net/1885/48187.

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Non-stoichiometric strontium iron oxide is described by an abbreviated formula SrFeOx (2.5 ≤ x ≤ 3.0) exhibits a variety of interesting physical and chemical properties over a broad range of temperatures and in different gaseous environments. The oxide contains a mixture of iron in the trivalent and the rare tetravalent state. The material at elevated temperature is a mixed oxygen conductor and it, or its derivatives,can have practical applications in oxygen conducting devices such as pressure driven oxygen generators, partial oxidation reactors in electrodes for solid oxide fuel cells (SOFC). ¶ This thesis examines the behaviour of the material at ambient and elevated temperatures using a broad spectrum of solid state experimental techniques such as: x-ray and neutron powder diffraction,thermogravimetric and calorimetric methods,scanning electron microscopy and Mossbauer spectroscopy. Changes in the oxide were induced using conventional thermal treatment in various atmospheres as well as mechanical energy (ball milling). ¶ ...
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Book chapters on the topic "SrFe12O19"

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Singhal, Sonal, and Kailash Chandra. "Magnetic and Mössbauer spectral studies of x (NiFe2O4) + (1−x)(SrFe12O19), x = 0, 0.2, 0.4, 0.6, 0.8 and 1.0 nanocomposites." In ICAME 2007, 265–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-78697-9_31.

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Rawat, D. "Effect of Substitution on the Electric and Magnetic Properties of SrFe12O19 Hexa Hard Ferrites." In Materials Research Foundations, 93–120. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902318-4.

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The hexagonal ferrites, also known as hexaferrites, have stimulated interest subsequent to their finding in the 1950s, which is steadily growing today. Both commercially and technologically, these materials have grown in importance. In addition to their employment as permanent magnets, they are commonly used as “magnetic recording and data storage materials, as well as components in electrical systems, notably those that activates at microwave/GHz frequency range”. The goal of the presented study is to offer new ideas for the development of magnetic samples Strontium hexaferrite SrFe12O19 (SrM) that are suited for specific applications, as well as to explain the influence of rare-earth (RE) substitution on the magnetic and electrical properties of SrM.
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Conference papers on the topic "SrFe12O19"

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Степович, M. Stepovich, Шипко, M. Shipko, Тихонов, A. Tikhonov, Коровушкин, V. Korovushkin, Костишин, and V. Kostishin. "Magnetic texture of hexagonal ferrites Ba and sr, used in microwave technology." In XXIV International Conference. Москва: Infra-m, 2016. http://dx.doi.org/10.12737/23203.

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The effect of a weak pulsed magnetic field on the structure and magnetic properties of polycrystalline anisotropic ferrites BaFe12O19 and SrFe12O19 was investigated. It was found that the dependence of the magnetic characteristics of the number of pulses for these materials varies greatly. The mechanism of influence of the magnetic field pulses on a magnetic microstructure of SrFe12O19 was suggested.
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Garcia, Tupac, E. de Posada, Ernesto Jimenez, J. L. Sanchez Ll., S. Diaz Castanon, Pascual Bartolo-Perez, W. Cauich, I. Oliva, J. L. Pena, and O. Ceh. "Polycrystalline SrFe12O19 thin films grown by pulsed laser deposition." In 3rd Iberoamerican Optics Meeting and 6th Latin American Meeting on Optics, Lasers, and Their Applications, edited by Angela M. Guzman. SPIE, 1999. http://dx.doi.org/10.1117/12.358345.

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IVANOVSKAYA, M., D. KOTSIKAU, V. PANKOV, and V. LOMONOSOV. "MICRO- AND NANOSTRUCTURE AND SURFACE STATE OF SRFE12O19 GRAINS." In Proceedings of the International Conference on Nanomeeting 2007. WORLD SCIENTIFIC, 2007. http://dx.doi.org/10.1142/9789812770950_0084.

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Костишин, V. Kostishin, Читанов, D. Chitanov, Кожитов, L. Kozhitov, Адамцов, and A. Adamtsov. "Using of ltcc-technology to obtain hexagonal ferrites for substrates microstrip devices microwave electronics mm-range of wavelengths." In XXIV International Conference. Москва: Infra-m, 2016. http://dx.doi.org/10.12737/23271.

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Abstract:
In the work by the method low temperature co-fired ceramics (LTCC) obtained samples of isotropic and anisotropic polycrystalline hexaferrite BaFe12O19 and SrFe12O19. Using in the LTCC-technology the pressing operation for samples (tablets) in a magnetic field produces anisotropic hexaferrites, pressing without a magnetic field - isotropic hexaferrites. Application in the LTCC-technology molding process tape produces exclusively isotropic samples.
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Katlakunta, Sadhana, Sher Singh Meena, R. S. Shinde, and S. R. Murthy. "Effect of microwave sintering on structural and magnetic properties of SrFe12O19 nanopowders." In 2013 International Conference on Advanced Nanomaterials and Emerging Engineering Technologies (ICANMEET). IEEE, 2013. http://dx.doi.org/10.1109/icanmeet.2013.6609368.

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Ramlan, Muljadi, Priyo Sardjono, Suprapedi, Dedi Setiabudidaya, and A. Aminudin. "Analysis of physical and magnetic properties of hybrid composite magnet system SrFe12O19–NdFeB." In INTERNATIONAL CONFERENCE ON TRENDS IN MATERIAL SCIENCE AND INVENTIVE MATERIALS: ICTMIM 2020. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0014512.

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Panchal, Nital R., and Rajshree B. Jotania. "Heat treatment effects on dielectric properties of SrFe12O19 Hexaferrite prepared by an SHS route." In 2011 IEEE International Vacuum Electronics Conference (IVEC). IEEE, 2011. http://dx.doi.org/10.1109/ivec.2011.5747094.

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Ramlan, Dedi Setiabudidaya, A. Aminuddin Bama, Akmal Johan, Muljadi, and P. Sardjono. "Synthesis and Characterization of Strontium Hexa Ferrite (SrFe12O19) Powder by using Powder Metallurgy Method." In The International MIPAnet Conference on Science and Mathematics (IMC-SciMath). SCITEPRESS - Science and Technology Publications, 2019. http://dx.doi.org/10.5220/0010204800002775.

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Prathipkumar, S., and J. Hemalatha. "Enhancement in β phase and dielectric property of P(VDF-HFP)/SrFe12O19 nanofiber composite films." In DAE SOLID STATE PHYSICS SYMPOSIUM 2018. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5113022.

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Raghuvanshi, S., R. Verma, P. Tiwari, A. Ghosh, F. Mazaleyrat, and S. N. Kane. "On the structural and magnetic investigation of CoF2O4/SrFe12O19 nano-composite via one pot synthesis." In ADVANCES IN BASIC SCIENCE (ICABS 2019). AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5122402.

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