Relevant bibliographies by topics / Cobalt – Minerais – Ferrites de cobalt

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
  5. Reports

Academic literature on the topic 'Cobalt – Minerais – Ferrites de cobalt'

Author: Grafiati
Published: 25 May 2024
Last updated: 31 July 2025

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Journal articles on the topic "Cobalt – Minerais – Ferrites de cobalt"

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Lazdovica, Kristīne, and 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 (November 10, 2021): 69–74. http://dx.doi.org/10.4028/www.scientific.net/kem.903.69.

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Pyrolysis of buckwheat straw with or without catalysts was investigated using the TGA-FTIR method to determine the influence of nickel and cobalt ferrites on the distribution of pyrolysis products. According to the obtained results, the overall shape of the thermogravimetric and derivative thermogravimetric curves is unchanged in the presence of nickel and cobalt ferrites but different weight losses were observed. All catalysts contribute to the formation of solid residue from BWS pyrolysis. The presence of cobalt ferrites exhibited the highest bio-oil yields, whereas the highest non-condensab
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Gupta, Priyanka, and 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, no. 4 (2023): 1–8. http://dx.doi.org/10.22161/ijcmp.7.4.1.

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Ferrites, a recently uncovered category of materials, have found extensive application in various critical domains. Among them, cobalt ferrites stand out as hard magnetic materials with exceptional coercivity.. We successfully prepared cobalt ferrites by using nanocrystalline powers by Sol gel method. In our study Crystalline, Magnetic nanoparticles of Cobalt ferrites (Cox Fe1-x Fe2 O4) (x = 0.4, 0.5, 0.6, 0.8) were synthesized by Sol Gel Method using ferric chloride and cobalt nitrate with NaOH as a reactant. Structural characteristics of samples were determined by X-Ray diffraction and TEM.
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de la Torre, Ernesto, Ana Lozada, Maricarmen Adatty, and Sebastián Gámez. "Activated Carbon-Spinels Composites for Waste Water Treatment." Metals 8, no. 12 (2018): 1070. http://dx.doi.org/10.3390/met8121070.

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Nowadays, mining effluents have several contaminants that produce great damage to the environment, cyanide chief among them. Ferrites synthesized from transition metals have oxidative properties that can be used for cyanide oxidation due to their low solubility. In this study, cobalt and copper ferrites were synthesized via the precipitation method, using cobalt nitrate, copper nitrate, and iron nitrate as precursors in a molar ratio of Co or Cu:Fe = 1:2 and NaOH as the precipitating agent. The synthesized ferrites were impregnated in specific areas on active carbon. These composites were char
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Boss, Alan F. N., Antonio C. C. Migliano, and Ingrid Wilke. "The Influence of Stoichiometry on the Index of Refraction of Cobalt Ferrite Samples at Terahertz Frequencies." MRS Advances 2, no. 58-59 (2017): 3663–66. http://dx.doi.org/10.1557/adv.2017.355.

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ABSTRACT We report an experimental study on the terahertz frequency dielectric properties of manganese cobalt ferrites (MnxCo1−xFe2O4) and nickel cobalt ferrites (NixCo1-xFe2O4) with three different stoichiometry each, x=0.3, x=0.5 and 0.7. Particularly, we present a comparison and discussion of the terahertz frequency indices of refraction of these two ferrites compositions. MnxCo1−xFe2O4 and NixCo1-xFe2O4 pellets with different Mn/Co and Ni/Co ratios (x=0.3, x=0.5 and x=0.7) were prepared by state-of-the-art ceramic processing. The morphology and chemical homogeneity of these ferrites were c
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Martin Cabañas, B., S. Leclercq, P. Barboux, M. Fédoroff, and G. Lefèvre. "Sorption of nickel and cobalt ions onto cobalt and nickel ferrites." Journal of Colloid and Interface Science 360, no. 2 (2011): 695–700. http://dx.doi.org/10.1016/j.jcis.2011.04.082.

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Assem, E. E., A. M. Abden, and O. M. Hemada. "Thermal Properties of Cobalt Cadmium Ferrites." Key Engineering Materials 224-226 (June 2002): 831–34. http://dx.doi.org/10.4028/www.scientific.net/kem.224-226.831.

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Kale, G. M., and T. Asokan. "Electrical properties of cobalt‐zinc ferrites." Applied Physics Letters 62, no. 19 (1993): 2324–25. http://dx.doi.org/10.1063/1.109405.

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Lenglet, M., F. Hochu, and J. Dürr. "Optical Properties of Mixed Cobalt Ferrites." Le Journal de Physique IV 07, no. C1 (1997): C1–259—C1–260. http://dx.doi.org/10.1051/jp4:19971100.

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Caltun, Ovidiu, Ioan Dumitru, Marcel Feder, Nicoleta Lupu, and Horia Chiriac. "Substituted cobalt ferrites for sensors applications." Journal of Magnetism and Magnetic Materials 320, no. 20 (2008): e869-e873. http://dx.doi.org/10.1016/j.jmmm.2008.04.067.

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Haiduk, Yu S., E. G. Petrova, J. A. Fedotova, et al. "Ferrites of cobalt and cobalt-zinc for magnetorheological materials: Preparation and properties." Next Materials 8 (July 2025): 100652. https://doi.org/10.1016/j.nxmate.2025.100652.

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Dissertations / Theses on the topic "Cobalt – Minerais – Ferrites de cobalt"

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Lopes, Moriyama Andre Luis. "Elaboration de poudres de CoFe2O4 nanostructurées et hiérarchisées ˸ : influence de la morphologie sur la détection et l'oxydation catalytique de gaz polluants." Electronic Thesis or Diss., Toulon, 2014. http://www.theses.fr/2014TOUL0023.

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Cette thèse s’inscrit dans le cadre de recherche sur de nouveaux matériaux pour des capteurs de gaz plus sensibles, plus sélectifs. La réponse électrique et ou catalytique d’un matériau sensible à un gaz dépend de nombreux paramètres comme la taille des grains, des faces cristallographiques exposées, la nature des cations, la présence de lacunes d’oxygènes. L'objectif de cette étude est d’élaborer et caractériser un même oxyde sous des morphologies différentes afin d’en étudier l’influence sur la réponse électrique et sur l'activité catalytique du matériau sensible. Ces nanoparticules ont été
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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 co
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Ajroudi, LIlia. "Ferrites de cobalt nanostructurés ; élaboration, caractérisation, propriétés catalytiques, électriques et magnétiques." Electronic Thesis or Diss., Toulon, 2011. http://www.theses.fr/2011TOUL0017.

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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 co
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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.

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Différentes méthodes de synthèses ont été mises au point pour contrôler la forme et la composition des nanoparticules. L’effet de la nature et la concentration des surfactants, des solvants, la température et le temps de synthèse a également été étudié. Les poudres ont été caractérisées par diffraction des rayons X et microscopie électronique à transmission, couplée à la spectroscopie d'énergie dispersive. Des propriétés catalytiques et de détection ont été évaluées respectivement en présence de faibles concentrations de CO et de NO2 dans de l’air synthétique.Des nanooctaèdres de CoxFe3-xO4 (
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Fernandes, de Medeiros Indira Aritana. "Nanostructuration de ferrites de cobalt CoxFe3-xO4 : Effets sur la catalyse et la détection de gaz polluants." Electronic Thesis or Diss., Toulon, 2018. http://www.theses.fr/2018TOUL0007.

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Différentes méthodes de synthèses ont été mises au point pour contrôler la forme et la composition des nanoparticules. L’effet de la nature et la concentration des surfactants, des solvants, la température et le temps de synthèse a également été étudié. Les poudres ont été caractérisées par diffraction des rayons X et microscopie électronique à transmission, couplée à la spectroscopie d'énergie dispersive. Des propriétés catalytiques et de détection ont été évaluées respectivement en présence de faibles concentrations de CO et de NO2 dans de l’air synthétique.Des nanooctaèdres de CoxFe3-xO4 (
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Ourry, Laurence. "Relation structure-propriétés de matériaux hybrides magnétiques polymère-ferrites spinelles." Paris 7, 2014. http://www.theses.fr/2014PA077193.

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J'ai travaillé à la conception de matériaux hybrides magnétiques constitués de polymère et de nanoparticules d'oxydes métalliques de type spinelles en me concentrant sur (i) ta synthèse de nanopoudres d'oxydes magnétiques par le procédé polyol et le contrôle de leurs propriétés magnétiques (modulation de la taille des NPs, recours à l'échange-bias pour augmenter la stabilité thermique magnétique. . . ), (ii) le contrôle de la dispersion des NPs par la connaissance de leur état de surface et des procédés de fonctionnalisation judicieux et (iii) leur mise en forme au sein de matrices de polymère
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Song, Sang-Hoon. "Magnetic and magnetoelastic properties of M-substituted cobalt ferrites (M=Mn, Cr, Ga, Ge)." [Ames, Iowa : Iowa State University], 2007.

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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 dispersio
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Villette, 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.

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Les conditions d'elaboration a basses temperatures de particules aciculaires de differents ferrites substitues au cuivre ont ete determinees en vue de l'etude de leurs proprietes physico-chimiques. La caracterisation structurale des ferrites peu riches en cuivre a permis de reveler les valences mixtes du cuivre et du fer. Dans ces phases stoechiometriques les ions cuivreux et ferriques sont localises en sites tetraedriques et octaedriques et les ions cuivriques et ferreux uniquement en sites octaedriques. Compte tenu des basses temperatures utilisees pour leur elaboration ces ferrites posseden
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Artus, 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.

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Ce travail cherche à optimiser les propriétés magnétiques de nanoparticules pour des applications dans le domaine du stockage de l'information. La méthodologie de synthèse est basée sur le procédé polyol. Après un résumé sur le magnétisme dans les nanoparticules et une présentation de la méthode polyol, la première partie de ce travail porte sur la synthèse de nanoparticules de ferrite-dé cobalt simple. Les particules synthétisées sont caractérisées sur le plan structural par diffraction des rayons X, MET, XANES et Mössbauer. Les propriétés magnétiques ont été également étudiées, notamment l'i
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Book chapters on the topic "Cobalt – Minerais – Ferrites de cobalt"

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Zhang, Xijun, Guoqian Wang, Xin Peng, et al. "Structural and Magnetic Properties of Rare Earth Lanthanum-Doped Cobalt Ferrites." In The Minerals, Metals & Materials Series. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92388-4_39.

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Caldeira, Luis Eduardo. "Synthesis, Properties, and Applications of Spinel Cobalt Ferrites." In Environmental Applications of Nanomaterials. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-86822-2_1.

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Bhuvaneswari, M., and S. Sendhilnathan. "Preparation and Characterization of Cobalt Doped Mn-Zn Ferrites." In Lecture Notes in Mechanical Engineering. Springer India, 2012. http://dx.doi.org/10.1007/978-81-322-1007-8_55.

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Chandra, Kailash, Sonal Singhal, and Sandeep Goyal. "Magnetic and Mössbauer spectral studies of nano crystalline cobalt substituted magnesium ferrites (MgxCo1 − xFe2O4)." In ICAME 2007. Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-78697-9_28.

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Siyar, Muhammad, and 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.

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The study is related to cobalt ferrites nanocomposites embedded with graphene nanosheets, prepared by co-precipitation method. Various doping of graphene from 0.1% up to 1% were applied within the cobalt ferrite structure to study its microwave and mechanical effects on the nanocomposites. Microstructural analysis confirms the homogeneous dispersion and successful adhesion of graphene nanosheets within the cobalt ferrite matrix. Microwave absorbing capacity of these samples was studied by Agilent network analyzer in low frequency band of microwave (1MHz to 2 GHz), Results reveals that graphene
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Ziaul 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.

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Cobalt ferrites have been regarded as one of the competitive candidates in diversified applications because of their tailored electrical and magnetic properties by tuning structural parameters with doping of transition and/or rare earth elements. To meet the ever-growing technological demands, varieties of new compositions of cobalt ferrites with diverse properties are continuously developed and produced through different synthetic routes across the globe and are made available to the consumers. In the recent past, three compositions of manganese-doped cobalt ferrite nanoparticles have been de
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Bokhan, Yuri. "Thermoelectric Elements with Negative Temperature Factor of Resistance." In Thermoelectricity [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98860.

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The method of manufacturing of ceramic materials on the basis of ferrites of nickel and cobalt by synthesis and sintering in controllable regenerative atmosphere is presented. As the generator of regenerative atmosphere the method of conversion of carbonic gas is offered. Calculation of regenerative atmosphere for simultaneous sintering of ceramic ferrites of nickel and cobalt is carried out. It is offered, methods of the dilated nonequilibrium thermodynamics to view process of distribution of a charge and heat along a thermoelement branch. The model of a thermoelement taking into account vari
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Corrêa, Iran Carlos Stalliviere, and 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.

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A distribuição dos nódulos e das crostas polimetálicas ocorre sobre a maior parte do assoalho oceânico, em profundidades acima dos 4.000 m. Estes apresentam estratificações laminares, com espessuras que variam de milímetros a decímetros. Estima-se que estes depósitos de nódulos e crostas polimetálicas, cubram uma área de aproximadamente 6,4 x 106 km2. Estes nódulos polimetálicos, são concreções rochosas formadas por camadas concêntricas de hidróxidos de ferro e manganês os quais se desenvolvem a partir de um núcleo o qual pode ser um fragmento de rocha, restos de origem biogênica como dentes d
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Souza, 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.

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Este capítulo apresenta e discute os principais aspectos legais dos recursos minerais que podem ser encontrados em áreas situadas além de jurisdição nacional, a chamada “ÁREA”, e sobre os quais a Autoridade Internacional dos Fundos Marinhos (AUTORIDADE) elaborou regulamentação internacional para prospecção e exploração de nódulos polimetálicos, os sulfetos polimetálicos e as crostas ferromanganesíferas ricas em cobalto. Especificamente este capítulo apresenta as etapas necessárias para a realização de prospecção na ÁREA, seguida de pedidos de aprovação de planos de trabalho para exploração na
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Cadar, Oana, Thomas Dippong, Marin Senila, and 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.

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Engineered nanomaterials with tailored properties are highly required in a wide range of industrial fields. Consequently, the researches dedicated to the identification of new applications for existing materials and to the development of novel promising materials and cost effective, eco-friendly synthesis methods gained considerable attention in the last years. Cobalt ferrite is one of the nanomaterials with a wide application range due to its unique properties such as high electrical resistivity, negligible eddy current loss, moderate saturation magnetization, chemical and thermal stability,
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Conference papers on the topic "Cobalt – Minerais – Ferrites de cobalt"

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Pannaparayil, T., and S. Komarneni. "Synthesis and charcterization of ultrafine cobalt ferrites." In International Magnetics Conference. IEEE, 1989. http://dx.doi.org/10.1109/intmag.1989.690371.

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Rao, G. S. N., S. Ananda Kumar, K. H. Rao, et al. "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.

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Sharma, Harish, Bharat Mishra, and 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.

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Boss, Alan F. N., Antonio C. C. Migliano, and 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.

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Kamran, Muhammad, Yasir Abbas, Tanveer Akhtar, and Muhammad Anis-ur-Rehman. "Electrical Properties of Lanthanum Doped Cobalt Ferrite Nanoparticales." In International Symposium on Advanced Materials. Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/p-5v3687.

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Ferrites materials with Spinel structure have been broadly studied in recent years because of numerous technological applications. Lanthanum substituted Co-ferrites nanoparticles (CoLa0.075Fe1.925O4) were synthesized via chemical co-precipitation method. X-ray Diffraction study revealed that prepared nanoparticales are single-phased spinel ferrites. Lattice constant, crystallite size, theoretical densities were estimated from XRD data. Electrical properties have been investigated with frequency ranging from 20Hz to 3MHz at room temperature. Dielectric constant and dielectric loss factor shows
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Kumar, N., D. R. Sagar, and 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.

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Venkateshwarlu, Ch, M. Prasad, G. Vinod, et al. "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.

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Venkatesh, D., K. V. Ramesh, Bimaleswar Sahu, and M. Chaitanya Varma. "Structural and magnetic properties of Cu substituted cobalt nanocrystalline ferrites." In 3RD PROCESS SYSTEMS ENGINEERING & SAFETY (PROSES) SYMPOSIUM 2023. AIP Publishing, 2025. https://doi.org/10.1063/5.0248506.

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Watawe, S. C., U. A. Bamne, and 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.

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Parvatheeswara Rao, B., K. H. Rao, P. S. V. Subba Rao, S. Pallam Setty, N. S. Gajbhiye, and 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.

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Reports on the topic "Cobalt – Minerais – Ferrites de cobalt"

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Song, Sang-Hoon. Magnetic and magnetoelastic properties of M-substituted cobalt ferrites (M=Mn, Cr, Ga, Ge). Office of Scientific and Technical Information (OSTI), 2007. http://dx.doi.org/10.2172/1342575.

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