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Auswahl der wissenschaftlichen Literatur zum Thema „Cobalt – Minerais – Ferrites de cobalt“
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Zeitschriftenartikel zum Thema "Cobalt – Minerais – Ferrites de cobalt"
Lazdovica, Kristīne, und Valdis Kampars. „Influence of Crystallite Size of Nickel and Cobalt Ferrites on the Catalytic Pyrolysis of Buckwheat Straw by Using TGA-FTIR Method“. Key Engineering Materials 903 (10.11.2021): 69–74. http://dx.doi.org/10.4028/www.scientific.net/kem.903.69.
Der volle Inhalt der QuelleAssem, E. E., A. M. Abden und O. M. Hemada. „Thermal Properties of Cobalt Cadmium Ferrites“. Key Engineering Materials 224-226 (Juni 2002): 831–34. http://dx.doi.org/10.4028/www.scientific.net/kem.224-226.831.
Der volle Inhalt der QuelleKale, G. M., und T. Asokan. „Electrical properties of cobalt‐zinc ferrites“. Applied Physics Letters 62, Nr. 19 (10.05.1993): 2324–25. http://dx.doi.org/10.1063/1.109405.
Der volle Inhalt der QuelleLenglet, M., F. Hochu und J. Dürr. „Optical Properties of Mixed Cobalt Ferrites“. Le Journal de Physique IV 07, Nr. C1 (März 1997): C1–259—C1–260. http://dx.doi.org/10.1051/jp4:19971100.
Der volle Inhalt der QuelleCaltun, Ovidiu, Ioan Dumitru, Marcel Feder, Nicoleta Lupu und Horia Chiriac. „Substituted cobalt ferrites for sensors applications“. Journal of Magnetism and Magnetic Materials 320, Nr. 20 (Oktober 2008): e869-e873. http://dx.doi.org/10.1016/j.jmmm.2008.04.067.
Der volle Inhalt der QuelleMartin Cabañas, B., S. Leclercq, P. Barboux, M. Fédoroff und G. Lefèvre. „Sorption of nickel and cobalt ions onto cobalt and nickel ferrites“. Journal of Colloid and Interface Science 360, Nr. 2 (August 2011): 695–700. http://dx.doi.org/10.1016/j.jcis.2011.04.082.
Der volle Inhalt der QuelleGupta, Priyanka, und Dr Ravi Kumar Vijai. „Synthesis, Characterization and Dielectric properties of Nanoparticles of Cobalt Doped Ferrite (Cox Fe1-x Fe2 O4)“. International Journal of Chemistry, Mathematics and Physics 7, Nr. 4 (2023): 1–8. http://dx.doi.org/10.22161/ijcmp.7.4.1.
Der volle Inhalt der Quellede la Torre, Ernesto, Ana Lozada, Maricarmen Adatty und Sebastián Gámez. „Activated Carbon-Spinels Composites for Waste Water Treatment“. Metals 8, Nr. 12 (16.12.2018): 1070. http://dx.doi.org/10.3390/met8121070.
Der volle Inhalt der QuelleBoss, Alan F. N., Antonio C. C. Migliano und Ingrid Wilke. „The Influence of Stoichiometry on the Index of Refraction of Cobalt Ferrite Samples at Terahertz Frequencies“. MRS Advances 2, Nr. 58-59 (2017): 3663–66. http://dx.doi.org/10.1557/adv.2017.355.
Der volle Inhalt der QuelleBushkova, V. S., I. P. Yaremiy, B. K. Ostafiychuk, V. V. Moklyak und A. B. Hrubiak. „Mössbauer Study of Nickel-Substituted Cobalt Ferrites“. Journal of Nano- and Electronic Physics 10, Nr. 3 (2018): 03013–1. http://dx.doi.org/10.21272/jnep.10(3).03013.
Der volle Inhalt der QuelleDissertationen zum Thema "Cobalt – Minerais – Ferrites de cobalt"
Ajroudi, LIlia. „Ferrites de cobalt nanostructurés ; élaboration, caractérisation, propriétés catalytiques, électriques et magnétiques“. Thesis, Toulon, 2011. http://www.theses.fr/2011TOUL0017/document.
Der volle Inhalt der QuelleThis 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
Fernandes, de Medeiros Indira Aritana. „Nanostructuration de ferrites de cobalt CoxFe3-xO4 : Effets sur la catalyse et la détection de gaz polluants“. Thesis, Toulon, 2018. http://www.theses.fr/2018TOUL0007/document.
Der volle Inhalt der QuelleDifferent synthesis methods such as hydrothermal, solvothermal and thermal decomposition were developed to control nanoparticles shape and composition. The influence of synthesis parameters such as the nature of surfactants, the solvents, temperature and time of synthesis were also investigated. The powders were characterized by X-ray Diffraction and Transmission Electron Microscopy coupled with Dispersive Energy Spectroscopy. The catalytic and detection properties were evaluated in presence of CO and NO2 in synthetic air. CoxFe3-xO4 (x = 1, 1.5 ) nanooctahedra with 15-20 nm were produced by hydrothermal synthesis using different surfactants (CTAB, SDS and PVP). Nanocubes of CoFe2O4 were successfully obtained by solvothermal synthesis using oleylamine as surfactant. Nanooctahedra of CoxFe3-xO4 with x = 1.5 have higher activity for the CO conversion than those with x=1, and the conversion starts at lower temperature for the nanocubes. The nanocubes show lower sensitivity for the detection of NO2 than the nanooctahedra which indicates that the {111} faces are more reactive than the {100} ones in cobalt ferrites nanoparticles
Mahhouti, Zakaria. „Synthesis and characterization of functional monodispersed cobalt ferrite nanoparticles“. Electronic Thesis or Diss., Amiens, 2019. http://www.theses.fr/2019AMIE0010.
Der volle Inhalt der QuelleIn 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
Ourry, Laurence. „Relation structure-propriétés de matériaux hybrides magnétiques polymère-ferrites spinelles“. Paris 7, 2014. http://www.theses.fr/2014PA077193.
Der volle Inhalt der QuelleI worked on the design of magnetic hybrid materiais consisting of polyrner and spinel metal oxide nanoparticles focusing on (1) the synthesis of nanopowders of magnetic oxides by the polyol process and controlling the magnetic properties (timing of the size of NPs, use of exchange-bias to increase the magnetic thermal stability. . . ), (ii) the control of the dispersion of NPs as a function of their surface state and suitable functionalizations and ( iii) their processing in thermbplastic polymer matrices or preformed biopolymers. These points are discussed through three topics: (a) the synthesis of Fe304@CoO core-shell nanoparticles exhibiting exchange bias, and their further functionalization by polystyrene (PS) and polymethylmethacrylate (PMMA) brushes", we compared the magnetic properties (dipolar interactions and exchange bias) of these hybrids with those of bare nanoparticles. (b) The ynthesis of cobalt ferrite nanoparticles, CoFe204, and surface functionalization with two ligands. These nanoparticles were then introduced into a polyvinylidene fluoride matrix (PVDF) to design magnetoelectric films. (c) The design of magnetothermosensitives gels and films for drug delivery and tissue engineering. This project is an expioratory study to a project developed by IBM, Almaden Center, USA, where I reallzed a 3 month internship dunng my PhD involvement
Song, Sang-Hoon. „Magnetic and magnetoelastic properties of M-substituted cobalt ferrites (M=Mn, Cr, Ga, Ge)“. [Ames, Iowa : Iowa State University], 2007.
Den vollen Inhalt der Quelle findenVillette, Carole. „Elaboration et caractérisation de fines particules de ferrites spinelles substitués (cuivre/cobalt/manganèse) : relations structure-propriétés magnétiques“. Toulouse 3, 1995. http://www.theses.fr/1995TOU30286.
Der volle Inhalt der QuelleArtus, Mathieu. „Synthèse en milieu polyol et caractérisation de nanoparticules de ferrite de cobalt à forte anisotropie magnétique“. Paris 7, 2008. http://www.theses.fr/2008PA077244.
Der volle Inhalt der QuelleThis work deals about the enhancement of the magnetic properties of nanoparticles for magnetic data storage. The main synthesis method used, is the forced hydrolysis in polyol medium. After a short description of the magnetism in the nanoparticles and a presentation of synthesis method, the first of the present work concern the size control of the nanoparticles and is influence on the magnetic properties. The obtain product were characterized by différent technique such as the XRD, TEM, XANES, SQUID and Mössbauer. It reveals that, if a continuous variation of the blocking temperature was observed, the local structure of the particles is affected by the size reduction. After, the nanoparticles were doped with rare earth at 10%, in order to increase the value of TB. Various techniques were used to characterize the particles and the chemical composition is closed from the expected one, but the introduction caused a fall of the blocking temperature. This behavior is a consequence of a change in the cationic distribution, the departure of the Co²⁺ ion from the octahedral site to the tetrahedral one cause a loss of magnetic anisotropy. In the last chapter, the synthesis and the characterization of core/shell nanoparticles is describe. The existence of a exchange bias between the ferromagnetic core and the antiferromagnetic shell gave a rise of the blocking temperature, until 100 K for the CoFe₂O₄/CoO one. But synthesis improvement and a deeper investigation of the particles structure is require for this part
Moyeux, Alban. „Nouvelles réactions de couplage catalysées par des sels de fer ou de cobalt“. Cergy-Pontoise, 2008. http://www.theses.fr/2008CERG0484.
Der volle Inhalt der QuelleSustainable development now plays an increasingly important role in the strategy of chemical industries. As a part of these preoccupations, the search for more economic and more eco-friendly new efficient synthetic methods is of vital concern. The development of iron- and cobalt-catalyzed cross-coupling reactions is one of the current promising fields of research since these reactions are very attractive compared to the related palladium- or nickel-catalyzed procedures extensively used until now. Several new coupling procedures were described in this thesis. - The iron-catalyzed reaction between aryl Grignard reagents and alkyl halides. - The cobalt-catalyzed reaction between aryl or alkyl Grignard reagents and alkyl halides. - The iron-catalyzed oxidative heterocoupling between dialkylzinc and diarylzinc compounds The last reaction paves the way to a new class of coupling reactions between two organometallics
DOUARD, SYLVIE. „Nouveaux catalyseurs a base de ferrites spinelles substitues (molybdene/cobalt) et de molybdates pour l'oxydation menagee du propylene“. Toulouse 3, 1998. http://www.theses.fr/1998TOU30022.
Der volle Inhalt der QuelleValetas, Matthieu. „Couches minces magnétiques pour applications hyperfréquences : étude des Samarium-Cobalt et des Néodyme-Fer-Bore par pulvérisation radiofréquence magnétron“. Limoges, 2003. http://aurore.unilim.fr/theses/nxfile/default/e4a981a5-04cb-45b7-a3d1-c4d68512c71c/blobholder:0/2003LIMO0044.pdf.
Der volle Inhalt der QuelleBuchteile zum Thema "Cobalt – Minerais – Ferrites de cobalt"
Zhang, Xijun, Guoqian Wang, Xin Peng, Sujun Lu, Dalin Chen, Yutian Ma und Ailiang Chen. „Structural and Magnetic Properties of Rare Earth Lanthanum-Doped Cobalt Ferrites“. In The Minerals, Metals & Materials Series, 433–43. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92388-4_39.
Der volle Inhalt der QuelleCaldeira, Luis Eduardo. „Synthesis, Properties, and Applications of Spinel Cobalt Ferrites“. In Environmental Applications of Nanomaterials, 1–16. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-86822-2_1.
Der volle Inhalt der QuelleBhuvaneswari, M., und S. Sendhilnathan. „Preparation and Characterization of Cobalt Doped Mn-Zn Ferrites“. In Lecture Notes in Mechanical Engineering, 603–9. India: Springer India, 2012. http://dx.doi.org/10.1007/978-81-322-1007-8_55.
Der volle Inhalt der QuelleChandra, Kailash, Sonal Singhal und Sandeep Goyal. „Magnetic and Mössbauer spectral studies of nano crystalline cobalt substituted magnesium ferrites (MgxCo1 − xFe2O4)“. In ICAME 2007, 247–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-78697-9_28.
Der volle Inhalt der QuelleSiyar, Muhammad, und Asghari Maqsood. „Development of Graphene Based Cobalt-Ferrites Nanocomposites for Microwave Shielding“. In Ferrite [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99849.
Der volle Inhalt der QuelleZiaul Ahsan, Md. „Comparison of Magnetic and Electrical Properties of Manganese-Doped Cobalt Ferrite Nanoparticles“. In Applications of Ferrites [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.1001859.
Der volle Inhalt der QuelleBokhan, Yuri. „Thermoelectric Elements with Negative Temperature Factor of Resistance“. In Thermoelectricity [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98860.
Der volle Inhalt der QuelleCorrêa, Iran Carlos Stalliviere, und Lauro Júlio Calliari. „Minerais Polimetálicos“. In Recursos Minerais Marinhos. Sociedade Brasileira de Geofísica - SBGf, 2023. http://dx.doi.org/10.22564/sbgfbook.cad5.2023.cap12.
Der volle Inhalt der QuelleSouza, Kaiser Gonçalves. „Aspectos Legais dos Recursos Minerais da Área Internacional dos Oceanos“. In Recursos Minerais Marinhos. Sociedade Brasileira de Geofísica - SBGf, 2023. http://dx.doi.org/10.22564/sbgfbook.cad5.2023.cap19.
Der volle Inhalt der QuelleCadar, Oana, Thomas Dippong, Marin Senila und Erika-Andrea Levei. „Progress, Challenges and Opportunities in Divalent Transition Metal-Doped Cobalt Ferrites Nanoparticles Applications“. In Advanced Functional Materials. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.93298.
Der volle Inhalt der QuelleKonferenzberichte zum Thema "Cobalt – Minerais – Ferrites de cobalt"
Pannaparayil, T., und S. Komarneni. „Synthesis and charcterization of ultrafine cobalt ferrites“. In International Magnetics Conference. IEEE, 1989. http://dx.doi.org/10.1109/intmag.1989.690371.
Der volle Inhalt der QuelleRao, G. S. N., S. Ananda Kumar, K. H. Rao, B. Parvatheeswara Rao, A. Gupta, O. Caltun, I. Dumitru und Cheol Gi Kim. „Doped Cobalt Ferrites for Stress Sensor Applications“. In 2007 2nd IEEE International Conference on Nano/Micro Engineered and Molecular Systems. IEEE, 2007. http://dx.doi.org/10.1109/nems.2007.352231.
Der volle Inhalt der QuelleSharma, Harish, Bharat Mishra und P. K. Sharma. „X-ray diffraction analysis on copper-cobalt ferrites“. In NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS: NCPCM2020. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0061267.
Der volle Inhalt der QuelleBoss, Alan F. N., Antonio C. C. Migliano und Ingrid Wilke. „Terahertz frequency electrical properties of nickel cobalt ferrites“. In 2016 41st International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz). IEEE, 2016. http://dx.doi.org/10.1109/irmmw-thz.2016.7758775.
Der volle Inhalt der QuelleKamran, Muhammad, Yasir Abbas, Tanveer Akhtar und Muhammad Anis-ur-Rehman. „Electrical Properties of Lanthanum Doped Cobalt Ferrite Nanoparticales“. In International Symposium on Advanced Materials. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/p-5v3687.
Der volle Inhalt der QuelleKumar, N., D. R. Sagar und P. Kishan. „Cobalt substituted Li-Ti ferrites for phase shifter application“. In IEEE International Magnetics Conference. IEEE, 1999. http://dx.doi.org/10.1109/intmag.1999.837210.
Der volle Inhalt der QuelleVenkateshwarlu, Ch, M. Prasad, G. Vinod, Y. Suresh Reddy, K. Rajashekar, B. Naresh, P. Ramesh, U. Dhasaratha, P. Neeraja und J. Laxman Naik. „A.C conductivity of cobalt substituted in copper ferrites by DSCM“. In INTERNATIONAL CONFERENCE ON MULTIFUNCTIONAL MATERIALS (ICMM-2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0022445.
Der volle Inhalt der QuelleWatawe, S. C., U. A. Bamne und B. D. Sarwade. „Interpretation of microstructure dependent magnetic properties of cobalt substituted lithium ferrites“. In Proceedings of the Symposium F. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812704344_0018.
Der volle Inhalt der QuelleParvatheeswara Rao, B., K. H. Rao, P. S. V. Subba Rao, S. Pallam Setty, N. S. Gajbhiye und O. F. Caltun. „Electric and Magnetic Studies on Copper/Cobalt Substituted Ni-Zn Ferrites“. In Proceedings of the Symposium R. WORLD SCIENTIFIC, 2005. http://dx.doi.org/10.1142/9789812701718_0030.
Der volle Inhalt der QuellePazhanivelu, V., und R. Murugaraj. „Effect of Ni2+ ion on the structural, magnetic and electrical properties of cobalt ferrites“. In SOLID STATE PHYSICS: Proceedings of the 56th DAE Solid State Physics Symposium 2011. AIP, 2012. http://dx.doi.org/10.1063/1.4710440.
Der volle Inhalt der QuelleBerichte der Organisationen zum Thema "Cobalt – Minerais – Ferrites de cobalt"
Song, Sang-Hoon. Magnetic and magnetoelastic properties of M-substituted cobalt ferrites (M=Mn, Cr, Ga, Ge). Office of Scientific and Technical Information (OSTI), Dezember 2007. http://dx.doi.org/10.2172/1342575.
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