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Dissertations / Theses on the topic 'Ferrite (Magnetic materials)'

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Published: 4 June 2021
Last updated: 12 February 2022

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1

Rondinone, Adam Justin. "Superparamagnetic relaxation dynamics of magnetic spinel ferrite nanoparticles." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/30958.

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2

Chen, Ritchie. "Optimizing hysteretic power loss of magnetic ferrite nanoparticles." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/81064.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2013.<br>Cataloged from PDF version of thesis. "June 2013."<br>Includes bibliographical references (p. 44-46).<br>This thesis seeks to correlate hysteretic power loss of tertiary ferrite nanoparticles in alternating magnetic fields to trends predicted by physical models. By employing integration of hysteresis loops simulated from physical models for single-domain ferromagnets, we have identified ferrite materials optimal for remote heating. Several organometallic thermal decomposition methods were
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3

Vestal, Christy Riann. "Magnetic couplings and superparamagnetic properties of spinel ferrite nanoparticles." Diss., Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-06072004-131405/unrestricted/vestal%5Fchristy%5Fr%5F200405%5Fphd.pdf.

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4

Dondero, Russell A. "Silica coating of spinel ferrite nanoparticles." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/27375.

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5

Han, Man Huon. "Development of synthesis method for spinel ferrite magnetic nanoparticle and its superparamagnetic properties." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26465.

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Thesis (Ph. D.)--Chemistry and Biochemistry, Georgia Institute of Technology, 2009.<br>Committee Chair: Z. John Zhang; Committee Member: Angus Wilkinson; Committee Member: C P Wong; Committee Member: E. Kent Barefield; Committee Member: Mostafa El-Sayed. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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6

Vaughan, Lisa Ann. "Enviromentally benign synthesis and application of some spinel ferrite nanopartilces." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/44876.

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In this thesis, the commercial viability of the aminolytic synthesis method is explored through robustness, versatility, and waste reduction studies. We report the preparation of metal precursors and the development of a synthetic approach using an aminolytic reaction of metal carboxylates in oleylamine and non-coordinating solvent. Manganese doping in the cobalt ferrites allows for the investigation of the couplings. All the compositions in the series Co1-xMnxFe2O4, 0.0  x  1.0 were synthesized via the aminolytic reaction. The coercivity decreases with increasing Mn2+ concentration due
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7

Cripps, Chala Ann. "Synthesis and characterization of cobalt ferrite spinel nanoparticles doped with erbium." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/30855.

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8

Gradzki, Pawel Miroslaw. "Core loss characterization and design optimization of high-frequency power ferrite devices in power electronics applications." Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-06062008-165934/.

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9

Samia, Anna Cristina S. "Design and control of the superparamagnetic properties of cobalt-based spinel ferrite nanoparticles." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/31048.

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10

Scarberry, Kenneth Edward. "Biomedical applications of cobalt-spinel ferrite nanoparticles for cancer cell extraction and drug delivery." Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/33951.

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In this presentation it is demonstrated that the unique magnetic properties of superparamagnetic cobalt-spinel ferrite nanoparticles can be employed in several novel applications. A method to selectively capture and remove pathogens from infected organisms to improve longevity is presented. Evidence is provided to show that automated methods using modified forms of hemofiltration or peritoneal dialysis could be used to eliminate the particle/pathogen or particle/infected cell conjugates from the organism postoperatively. It is shown that disparately functionalized nanoparticles can be used
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11

Washburn, Cody. "Electrophoretic deposition of ferrite for on chip copper planar inductors /." Online version of thesis, 2006. http://hdl.handle.net/1850/5196.

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12

Ring, Andrew Phillip. "Investigation of magnetic and magnetoelastic properties of novel materials involving cobalt ferrite and terbium silicon germanium systems." [Ames, Iowa : Iowa State University], 2007.

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13

Martin, Lara Jean. "Flexible magnetic composite for antenna applications in radio frequency identification (RFID)." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22599.

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Thesis (Ph. D.)--Materials Science and Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: Dr. C. P. Wong; Committee Co-Chair: Dr. Manos Tentzeris; Committee Member: Dr. Hamid Garmestani; Committee Member: Dr. Meilin Liu; Committee Member: Dr. Z. L. Wang.
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14

Apaydin, Nil. "Novel Implementations of Coupled Microstrip Lines on Magnetic Substrates." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1373897365.

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15

Arrieta, Concha José Luis 1981. "Study of a ferrite circulator for PBG waveguides in the microwave band : Estudo de um circulador de ferrita para guias PBG na faixa de micro-ondas." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259175.

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Orientador: Hugo Enrique Hernández Figueroa<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação<br>Made available in DSpace on 2018-08-26T15:57:35Z (GMT). No. of bitstreams: 1 ArrietaConcha_JoseLuis_M.pdf: 2860251 bytes, checksum: a9513ec6b0227b83e8ccdb097adfef27 (MD5) Previous issue date: 2014<br>Resumo: Redes de comunicação ópticas são parte da sociedade de informação de hoje, em que as fibras ópticas têm um papel muito importante, uma vez que são amplamente utilizados em redes de comunicação e outros sistemas de comunicação atuai
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16

Song, Qing. "Size and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites Nanocrystals." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7645.

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Size and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites Nanocrystals Qing Song 216 pages Directed by Dr. Z. John Zhang The correlationship between magnetic properties and magnetic couplings is established through the investigations of various cubic spinel ferrite nanocrystals. The results of this thesis contribute to the knowledge of size and shape controlled synthesis of various spinel ferrites and core shell architectured nanocrystals as well as the nanomagnetism in spinel ferrites by systematically investigating the effects of spin orbital coupling, mag
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17

Toledo, Dennis. "Cobalt Ferrite Nanoparticles Fabricated via Co-precipitation in Air: Overview of Size Control and Magnetic Properties." FIU Digital Commons, 2015. http://digitalcommons.fiu.edu/etd/2298.

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Cobalt Ferrite has important, size-dependent magnetic properties. Consequently, an overview of particle size is important. Co-precipitation in air was the fabrication method used because it is comparatively simple and safe. The effects of three different reaction times including 1, 2, 3 hour(s) on particle size were compared. Also, the effectiveness of three different capping agents (Oleic Acid, Polyvinylpyrollidone (PVP), and Trisodium Citrate) in reducing aggregation and correspondingly particle size were examined. Using Welch’s analysis of variance (ANOVA) and the relevant post hoc tests, t
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18

Crain, Bruce Richard. "Vector finite element methods for spurious-free solutions of unbounded dielectric and ferrite loaded waveguiding structures." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/15501.

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19

Camus, Olivier. "Modélisation des propriétés magnétiques de matériaux ferrite et de composites à base de ferrite absorbant le rayonnement électromagnétique." Vandoeuvre-les-Nancy, INPL, 1996. http://www.theses.fr/1996INPL022N.

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Cette étude porte sur la modélisation de la perméabilité magnétique de ferrites pour leur utilisation en tant qu'absorbants aux ondes hyperfréquences. Les ferrites étudiés se trouvent sous la forme de matériaux frittés ou de composites. L’absorption d'une onde électromagnétique par des ferrites frittés est provoquée par la rotation de l'aimantation dans des domaines magnétiques et par le déplacement des parois entre ces domaines. Nous développons des modèles basés sur l'association de phénomènes résonants et/ou relaxants pour représenter la dépendance en fréquence de la perméabilité magnétique
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20

RIBEIRO, THATIANA G. D. "Sintese e caracterizacao de nanoparticulas magneticas de oxidos mistos de MnFesub(2)Osub(4) recobertas comm quitosona. Estudos da influencia na dopagem com Gdsup(3+) nas propriedades estruturais e magneticas." reponame:Repositório Institucional do IPEN, 2008. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11515.

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Made available in DSpace on 2014-10-09T12:52:45Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:02:48Z (GMT). No. of bitstreams: 0<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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21

Mukherjee, Devajyoti. "Growth and Characterization of Epitaxial Thin Films and Multiferroic Heterostructures of Ferromagnetic and Ferroelectric Materials." Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3622.

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Multiferroic materials exhibit unique properties such as simultaneous existence of two or more of coupled ferroic order parameters (ferromagnetism, ferroelectricity, ferroelasticity or their anti-ferroic counterparts) in a single material. Recent years have seen a huge research interest in multiferroic materials for their potential application as high density non-volatile memory devices. However, the scarcity of these materials in single phase and the weak coupling of their ferroic components have directed the research towards multiferroic heterostructures. These systems operate by coupling th
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22

Zagnazi, Hassan. "Preparation et etude de l'hexaferrite de baryum par la voie verriere." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13071.

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Obtention de l'hexaferrite de baryum bafe::(12)o::(19) par cristallisation dans un verre bao-b::(2)o::(3); la cristallisation passe par bafe::(2)o::(4), et b::(2)o::(3) joue un role determinant, le choix de la composition de depart etant tres important (l'exces de b::(2)o::(3) reagit sur bafe::(12)o::(10) et diminue son rendement). Les poudres d'hexaferrite de baryum preparees presentent une aimantation qui varie de 60 a 68 uemcgs/g et un champ coercitif qui descend de 5000 oe a 1600 oe. Les mesures magnetiques des verres etudies montrent un comportement "verre de spin
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23

Fechine, Pierre BasÃlio Almeida. "Estudo das propriedades estruturais e elÃtricas das granadas ferrimagnÃticas GdIGXYIG1-X e suas aplicaÃÃes em componentes de microondas." Universidade Federal do CearÃ, 2008. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=1389.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>Devido ao rÃpido progresso no desenvolvimento de sistemas de comunicaÃÃo em microondas, as cerÃmicas dielÃtricas e magnÃticas (ferritas) se tornaram atrativas para o uso em dispositivos. Embora as ferritas do tipo espinel terem sido os primeiros materiais utilizados para microondas, as granadas possuem menores perdas dielÃtricas e, portanto, sÃo preferidas em muitas aplicaÃÃes. As elevadas exigÃncias que as aplicaÃÃes elÃtricas modernas requerem dos materiais magnÃticos fazem com que novas tÃcnicas e produtos estejam permanentement
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24

Ibrahim, Fatima. "Theoretical study of electronic structure and magnetism in materials for spintronics." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAE003/document.

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L'avenir de la spintronique repose sur le développement de matériaux ayant des propriétés magnétiques remarquables. L'objectif de cette thèse est de comprendre la physique des deux matériaux fonctionnels proposés pour des applications spintroniques qui utilisent des simulations de la densité fonctionnelle.Nous nous sommes intéressés dans une première partie au ferrite de gallium pour lequel il a été montré que les propriétés dépendaient de la concentration de fer.Les spectres optiques ont été calculés et comparés aux spectres expérimentaux suggérant des niveaux élevés de désordre. Dans la deux
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25

Orlando, Andrea. "Numerical modeling and analysis of complex electromagnetic structures, including those containing ferrites." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2009. http://scholarsmine.mst.edu/thesis/pdf/Orlando_09007dcc80705498.pdf.

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Thesis (M.S.)--Missouri University of Science and Technology, 2009.<br>Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed November 17, 2009) Includes bibliographical references (p. 83-84).
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26

Hudson, Guy Frederick, and Guy Frederick Hudson. "Surface chemistry of magnetic oxides and ferrites and their interaction with selected components of magnetic inks." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184919.

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Studies to compare and elucidate some of the surface chemical characteristics of chromium dioxide and barium ferrite magnetic particles have been performed. These investigations primarily involved using the technique of flow microcalorimetry to look at the interaction of molecular probes (pyridine, 4-nitrophenol) and various components present in a magnetic ink (dispersants and model binder compounds) with the particles. The interactions were measured in terms of heats of adsorption and adsorption density. Ancillary experiments using FTIR and XPS were also performed. Both electrophoretic measu
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27

Pessoa, R?gia Chacon. "Estudo das caracter?sticas magn?ticas e absorvedoras das ferritas de nizn, niznmn, mnzn, nimg, nicuzn e nicuznmg obtidas via m?todo do citrato precursor." Universidade Federal do Rio Grande do Norte, 2009. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17716.

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Made available in DSpace on 2014-12-17T15:42:08Z (GMT). No. of bitstreams: 1 RegiaCP_TESE.pdf: 5580865 bytes, checksum: b0d574167afcc48aece0c780848733c2 (MD5) Previous issue date: 2009-12-22<br>Universidade Estadual de Roraima<br>Were synthesized systems Ni0,5Zn0,5Fe2O4, i0,2Zn0,5Mn0,3Fe2O4, Mn0,5Zn0,5Fe2O4, Ni0,5Mg0,5Fe2O4, Ni0,2Cu0,3Zn0,5Fe2O4 and Ni0,2Cu0,3Zn0,5Mg0,08Fe2O4, the precursors citrate method. The decomposition of the precursors was studied by thermogravimetric analysis and spectroscopy in the infrared region, the temperature of 350?C/3h. The evolution of the phases formed aft
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28

CAMILO, RUTH L. "Síntese e caracterização de nanopartículas magnéticas de ferrita de cobalto recobertas por 3-aminopropiltrietoxissilano para uso como material híbrido em nanotecnologia." reponame:Repositório Institucional do IPEN, 2006. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11436.

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29

Sabo, Daniel E. "Novel synthesis of metal oxide nanoparticles via the aminolytic method and the investigation of their magnetic properties." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/50122.

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Metal oxide nanoparticles, both magnetic and nonmagnetic, have a multitude of applications in gas sensors, catalysts and catalyst supports, airborne trapping agents, biomedicines and drug delivery systems, fuel cells, laser diodes, and magnetic microwaves. Over the past decade, an inexpensive, simple, recyclable, and environmentally friendly large, scale synthesis method for the synthesis of these metal oxide nanoparticles has been sought. Many of the current techniques in use today, while good on the small, laboratory bench scale, suffer from drawbacks that make them unsuitable for the indust
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30

Adair, Antony. "Observed super-spin class behavior in Ni₀.₅Zn₀.₅Fe₂O₄ nanoparticles." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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31

Camilo, Ruth Luqueze. ""Síntese e caracterização de nanopartículas magnéticas de ferrita de cobalto recobertas por 3-aminopropiltrietoxissilano para uso como material híbrido em nanotecnologia"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-27092006-135110/.

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Atualmente com o advento da nanociência e nanotecnologia, as nanopartículas magnéticas têm encontrado inúmeras aplicações nos campos da biomedicina, diagnóstico, biologia molecular, bioquímica, catálise, etc. As nanopartículas magnéticas funcionalizadas são constituídas de um núcleo magnético, envolvido por uma camada polimérica com sítios ativos, que podem ancorar metais ou compostos orgânicos seletivos. Estas nanopartículas são consideradas materiais híbridos orgânico-inorgânicos de grande interesse em aplicações comerciais devido à particularidade das propriedades obtidas. Entre as aplicaçõ
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32

Gass, James. "Functional Magnetic Nanoparticles." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4047.

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Nanoparticle system research and characterization is the focal point of this research and dissertation. In the research presented here, magnetite, cobalt, and ferrite nanoparticle systems have been explored in regard to their magnetocaloric effect (MCE) properties, as well as for use in polymer composites. Both areas of study have potential applications across a wide variety of interdisciplinary fields. Magnetite nanoparticles have been successfully dispersed in a polymer. The surface chemistry of the magnetic nanoparticle proves critical to obtaining a homogenous and well separated high densi
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33

Silva, Jos? Eves Mendes da. "S?ntese, caracteriza??o de ferritas espin?lio com propriedades magn?ticas e absorvedoras de microondas." Universidade Federal do Rio Grande do Norte, 2013. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17768.

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Made available in DSpace on 2014-12-17T15:42:21Z (GMT). No. of bitstreams: 1 JoseEMS_TESE.pdf: 5374821 bytes, checksum: 56fe60cd3bbf0a42f7512c62fe5b976e (MD5) Previous issue date: 2013-03-08<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>Were synthesized spinel-type ferrites with general formula Ni0,8Mg0.2-xMxFe2O4, where M represents the doping Mn, Co or Mn + Co simultaneously, x ranges for the values 0.02, 0.05 and 0.1. The value of x was divided by 2 in cases where M equals Mn and Co conjugates. We used the citrate precursor method and heat treatment to obtain the phase
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Morber, Jenny Ruth. "1D nanowires understanding growth and properties as steps toward biomedical and electrical application /." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24825.

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Thesis (Ph.D.)--Materials Science and Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Snyder, Robert; Committee Co-Chair: Wang, Zhong Lin; Committee Member: El-Sayed, Mostafa; Committee Member: Milam, Valeria; Committee Member: Summers, Christopher; Committee Member: Wong, C. P.
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Fulco, Ana Paula Pereira. "Comportamento magn?tico de comp?sitos de matriz polim?rica com adi??o de ferritas." Universidade Federal do Rio Grande do Norte, 2013. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12799.

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Made available in DSpace on 2014-12-17T14:07:09Z (GMT). No. of bitstreams: 1 AnaPPF_DISSERT.pdf: 3895025 bytes, checksum: 139d5ed551d6922e5b7f6e67a16602fd (MD5) Previous issue date: 2013-09-06<br>Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico<br>Polymer matrix composites offer advantages for many applications due their combination of properties, which includes low density, high specific strength and modulus of elasticity and corrosion resistance. However, the application of non-destructive techniques using magnetic sensors for the evaluation these materials is not possible sin
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Kaverine, Evgueni. "Contribution à la conception d'antennes MF, HF et VHF miniatures pour des applications mobiles, terrestres et maritimes." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S152.

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Les objectifs de ce travail concernent l'étude, la conception et la caractérisation d'antennes miniatures actives ou passives, large bande ou bande étroite fonctionnant en bandes MF, HF et VHF. Le manuscrit est divisé en cinq parties : La première partie présente un système de caractérisation d'antennes qui a été développé, validé et utilisé pour tous les aériens conçus. Ce système, basé sur une cellule à plaque parallèles (PPC), permet un large spectre de mesures telles que la mesure du gain, du point de compression, de l'intermodulation et de la sensibilité via une méthode rayonnée, particul
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Maciel, Sara Alves. "Preparação e cracterização de compósitos de CoFe2O4/ZrO2." Universidade Federal de Goiás, 2016. http://repositorio.bc.ufg.br/tede/handle/tede/5738.

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Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2016-07-25T10:59:35Z No. of bitstreams: 2 Dissertação - Sara Alves Maciel - 2016.pdf: 11054901 bytes, checksum: 8cddf79cb5700731533eb7125fe234a3 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2016-07-25T11:13:28Z (GMT) No. of bitstreams: 2 Dissertação - Sara Alves Maciel - 2016.pdf: 11054901 bytes, checksum: 8cddf79cb5700731533eb7125fe234a3 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Made available
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Yaya, Dagal Dari. "Conception, réalisation et caractérisation d'inductances planaires à couches magnétiques." Phd thesis, Université Jean Monnet - Saint-Etienne, 2013. http://tel.archives-ouvertes.fr/tel-00993575.

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Ce travail de thèse concerne la miniaturisation et l'intégration de composants magnétiques comme les inductances utilisées dans les convertisseurs DC-DC et les circuits haute fréquence. Cette thèse a pour objectifs : - de développer une méthodologie d'étude des inductances à couches magnétiques - de montrer la faisabilité de tels composants utilisant des couches épaisses de ferrite (50 à 500µm). Le contenu de notre document s'articule ainsi autour de trois axes : la simulation, la réalisation et la caractérisation. En simulation, le logiciel HFSS, nous a permis de concevoir, de prédire le comp
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Gonçalves, Lucas Fabrício. "Desenvolvimento de filmes finos multiferróicos de BiFeO3 modificadas com Ca com potencial aplicação em memórias de multiplos estados /." Guaratinguetá, 2018. http://hdl.handle.net/11449/157086.

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Orientador: Alexandre Zirpoli Simoes<br>Banca: José Vitor Candido de Souza<br>Banca: Mauricio Antonio Algatti<br>Banca: Francisco Moura Filho<br>Banca: Filiberto González Garcia<br>Resumo: Os elementos de memórias de múltiplos estados nos quais a informação pode ser armazenada tanto nos estados de polarização quanto no estado de magnetização espontânea do elemento, podem ser obtidos, através da fabricação de filmes finos texturizados de BiFeO3 (BFO) dopados com Cálcio, sobre eletrodo de (Pt/TiO2/SiO2/Si), visando otimizar as propriedades ferroeletromagnêticas. O método Pechini ou percursores p
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Souza, Josà Adailson de. "AvaliaÃÃo da FragilizaÃÃo a 400ÂC e a 475ÂC do AÃo InoxidÃvel FerrÃtico AISI 444 Utilizado em Torres de DestilaÃÃo de PetrÃleo." Universidade Federal do CearÃ, 2004. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=7342.

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AgÃncia Nacional do PetrÃleo<br>Os efeitos do envelhecimento a 400&#61616;C e 475&#61616;C na resistÃncia a corrosÃo, nas propriedades mecÃnica e magnÃtica do aÃo inoxidÃvel ferrÃtico AISI 444 foram investigados. O endurecimento causado pelo envelhecimento em ambas temperaturas foi medido, tendo sido observado que à mais intenso a 475ÂC. A susceptibilidade de corrosÃo localizada aumentou com o tempo de envelhecimento nas duas temperaturas, sendo tambÃm mais significativa a 475ÂC do que a 400ÂC. Com o tratamento de dissoluÃÃo a 570ÂC e 675ÂC ocorre a recuperaÃÃo dos valores de dureza e da resis
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41

Giraud, Alexandre. "Caractérisation des matériaux magnétiques et modélisation des pertes fer dans le stator des machines électriques fonctionnant à haute fréquence." Phd thesis, Toulouse, INPT, 2017. http://oatao.univ-toulouse.fr/19732/1/GIRAUD_Alexandre.pdf.

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Le travail proposé est le résultat d’une collaboration entre le Laboratoire Laplace et l’IRT SaintExupéry. Il s’inscrit dans un projet visant à améliorer l’intégration des systèmes électriques afin d’électrifier les aéronefs. Le développement de l’énergie électrique à bord des aéronefs a de nombreux avantages : gain de masse, optimisation facilitée, … Plus précisément, c’est l’utilisation des machines électriques qui est ici étudiée. Actionneur, compresseur, beaucoup de système utilisant des énergies non-électriques peuvent être remplacés par des machines électriques. Comme dans tout système d
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42

Lahoubi, Mahieddine. "Structures magnétiques non colinéaires et transitions de phases dans les grenats ferrimagnétiques de terbium et d'yttrium." Grenoble 1, 1986. http://www.theses.fr/1986GRE10068.

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Determination par diffraction neutronique de la structure magnetique de tb::(3)fe::(5)o::(12) et de son evolution en fonction de la temperature de 4,2k a 650k (t::(n)=560k); analyse theorique des representation des groupes d'espace cubique ia3d rhomboedrique r**(3c) et application aux spectres de diffraction. Etude, par des mesures d'aimantation, du comportement de tb::(3)fe::(5)o::(12) et de tb::(x)y::(3-x)fe::(5)o::(12) (x=1,98; 1,0 et 0,37) en presence de champs magnetiques intenses, appliques selon les directions cristallographiques principales; mise en evidence de nombreuses transitions d
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43

Roy, Debangsu. "Exchange Spring Behaviour in Magnetic Oxides." Thesis, 2012. http://hdl.handle.net/2005/3172.

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When a permanent magnet is considered for an application, the quantity that quantifies the usability of that material is the magnetic energy product (BH)max. In today’s world, rare earth transition metal permanent magnets like Nd-Fe-B, Sm-Co possesses the maximum magnetic energy product. But still for the industrial application, the ferrite permanent magnets are the primary choice over these rare transition metal magnets. Thus, in the present context, the magnetic energy product of the low cost ferrite system makes it unsuitable for the high magnetic energy application. In this regard, exchang
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44

Venkatesha, N. "Nanoparticles for Bio-Imaging : Magnetic Resonance Imaging and Fluorescence Imaging." Thesis, 2015. http://etd.iisc.ernet.in/2005/3860.

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This thesis provides several nanomaterial systems that can be used as contrast agents in magnetic resonance imaging (MRI) and for optical fluorescence imaging. Nanoparticle systems described in this thesis fall under three categories: (a) graphene oxide-nanoparticle composites for MRI contrast agent application, (b) core-shell nanoparticles for MRI contrast agent application and (c) nanoparticle systems for both MRI and optical fluorescence imaging. In the case of graphene oxide based nano-composites, the following observations were made: (i) in the case of graphene oxide-Fe3O4 nanoparticle co
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45

Abdallah, Hafiz Mohammed Ibrahim. "Synthesis, magnetic and electrical characterizations of nanoparticle ferrites." Thesis, 2012. http://hdl.handle.net/10413/10920.

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The synthesis, structure and physical properties of a series of Mnx(Co, Mg)₁ˍxFe₂O₄, (Mg, Sr)₀.₂ Mn₀.₁Co₀.₇Fe₂O₄ and Mg₀.₅Mn₀.₅(RE)₀.₁Fe₁.₉O₄ (where RE are rare earth elements) nanoferrites have been studied. These compounds were synthesized at low reaction temperature of about 200 ⁰C using the glycol-thermal method. The starting materials were high-purity metal chlorides or nitrates which were precipitated by NH₄OH and KOH respectively. In addition, MnxCo₁₋xFe₂O₄ (x = 0, 0.5 and 1) samples were produced directly from high-purity metal oxides by high-energy ball milling technique. Single-phase
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46

Yavuz, Cafer Tayyar. "Accessible and green manufacturing of magnetite (ferrous ferric oxide) nanocrystals and their use in magnetic separations." Thesis, 2008. http://hdl.handle.net/1911/22266.

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This work describes the first size dependent magnetic separation in nanoscale. Magnetite (Fe3O4) nanocrystals of high quality and uniform size were synthesized with monodispersity below 10%. Magnetite nanocrystals of 4 nm to 33 nm (average diameter) were produced. Batch synthesis was shown to go up to 20 grams which is more than 10 times of a standard nanocrystal synthesis, without loosing the quality and monodispersity. Reactor design for mass (1 gram per hour) production of magnetite nanocrystals is reported for the first time. The cost of a kg of lab purity magnetite nanocrystals was shown
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47

"Synthesis, structural and magnetic properties of bulk and nanosized (Zn, Cd, Cu)0.5Ni0.5Fe2o4 and NiFe204 ferrites." Thesis, 2007. http://hdl.handle.net/10413/447.

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We present a study of the synthesis, structural and magnetic properties of bulk and nanosized (Zn, Cd, Cu)0:5Ni0:5Fe2O4 and NiFe2O4 compounds. The e®ects of electronic con¯guration and atomic sizes of Zn, Cd, Cu and Ni on the magnetic properties of the ferrites are the primary focus of the study. Di®erent synthesis routes, preparation conditions and how they a®ect single phase formation are explored. The synthesis was undertaken by solid{state reaction, combustion, hydrothermal and glycothermal techniques. The structure determination was by Xray di®raction. The magnetic measurements were perfo
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48

Ming-Feng, Kuo, and 郭明峯. "High Frequency Magneto-electric Properties of Composite Material Made of Soft Magnetic Ferrites and Hard Magnetic NdFeB." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/98903625493066356424.

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碩士<br>國立高雄師範大學<br>物理學系<br>95<br>The magneto-electric dynamics of composite material made of soft magnetic ferrites and hard magnetic NdFeB are studied. In this work, the nano-sized ferrites were synthesized by combustion method, and then were mixed with various amount (1, 3, 5 wt.%) of micro-sized NdFeB. The M-H behavior of the ferrites/NdFeB composites has displayed specific features of wasp-waisted hysteresis loops, correlated to the superposition of magnetization of hard and soft magnetic phases. The variation of magneto-impedance of composites has demonstrated that small amount of NdFeB ad
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49

"Analysis, Simulation and Measurements of CBS Antennas Loaded with Non-Uniformly Biased Ferrite Material." Doctoral diss., 2012. http://hdl.handle.net/2286/R.I.14838.

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abstract: When ferrite materials are used in antenna designs, they introduce some interesting and unique performance characteristics. One of the attractive features, for example, is the ability to reconfigure the center frequency of the antenna. In addition, ferrite materials also introduce a number of challenges in the modeling and simulation of such antennas. In order for the ferrite material to be useful in an antenna design, it usually is subjected to an external magnetic field. This field induces the internal magnetic field inside the ferrite material. The internal field plays a pivotal r
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50

Msomi, Justice Zakhele. "Mossbauer spectroscopy and x-ray diffraction study of (Cd, Zn) substituted mixed ferrites." Thesis, 2002. http://hdl.handle.net/10413/4412.

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The study of magnetic properties and structures of Zn and Cd substituted mixed ferrites has been carried out using Mossbauer spectroscopy and X-ray diffraction on powdered samples at about 300 K. Two series of mixed ferrites, (Cd, Zn)xCol-xFe2-xAlxO4 and (Cd, Zn)xCo0.9Fe1.7-xTi0.4O 4 (where 0≤ x≤1.0) were synthesized. In the former series the effect of simultaneous site dilution by Zn or Cd and Ai atoms on tetrahedral (A) and octahedral (B) sites is investigated and in the latter the effect of single site dilution by Zn or Cd is also studied. The Mossbauer spectra show that the compounds trans
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