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Dissertations / Theses on the topic 'Nickel ferrite'

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Published: 4 June 2021
Last updated: 26 July 2025

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1

Souza, NatÃlia Dantas Gomes de. "Obtaining magnetic nanobiocompÃsitos consisting of galactomannan, glycerol and nickel ferrite and zinc." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=11766.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>FundaÃÃo de Amparo à Pesquisa do Estado do CearÃ<br>Nos Ãltimos anos, um grande interesse na associaÃÃo de materiais magnÃticos e biolÃgicos tem sido relatado na literatura. A obtenÃÃo de novos compÃsitos constituÃdos de galactomanana (GM), nanopartÃculas magnÃticas (MNPs) de NiZn e glicerol (GL) foram produzidos em diferentes proporÃÃes com finalidade de potencializar as caracterÃsticas individuais de cada material para futuras aplicaÃÃes. Sendo assim, as propriedades estruturais, magnÃticas e dielÃtricas dos nanobiocompÃsitos for
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2

Channing, Amanda Chemical Sciences &amp Engineering Faculty of Engineering UNSW. "Inert anodes for aluminium electrowinning: nickel ferrite based cermets." Awarded by:University of New South Wales. Chemical Sciences & Engineering, 2007. http://handle.unsw.edu.au/1959.4/40686.

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Greenhouse gases including carbon dioxide are formed by the consumption of carbon anodes during aluminium production, making it a major contributor to global emissions. This consumption necessitates replacement of the anodes in electrolysis cells every 2-3 weeks. A solution to the environmental and economic problems posed may be found in an inert anode which facilitates direct decomposition of alumina to aluminium and oxygen. Finding a material which is stable in the aggressive high temperature electrolyte poses a major materials engineering challenge. In this study, apparatus was designed a
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3

Karakas, K. Z., R. Boncukcuoglu, I. H. Karakas, and M. T. Yılmaz. "The Effect of pH in Nickel Ferrite Nanoparticles Synthesis by Hydrothermal Method." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35022.

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In this study, NiFe2O4 nano particles was prepared with aqueous solutions of nickel nitrate and ferric nitrate salts. An appropriate ratio of solutions nickel nitrate and ferric nitrate were dissolved in deionized water and poured into a crucible. Later, polyethylene glycol 600 (PEG 600) was added to this mixture. Samples were adjusted to various pH values. In experiments, samples obtained by hydrothermal method were heat treated at 700 oC for 8 h to enhance their crystallinity and remove the residual organic materials. The structural and morphological properties of NiFe2O4 nano particle
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4

Karakas, Z. K., R. Boncukcuoglu, I. H. Karakas, and M. Ertugrul. "Investigation of the Effects of Reaction Temperature in NiFe2O4 Nanoparticles Synthesis by Hydrothermal Method." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35028.

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In this experimental study was investigated the effect of reaction temperature in NiFe2O4 nanoparticles synthesis with hydrothermal method. An appropriate ratio of solutions nickel nitrate and ferric nitrate were dissolved in deionized water and poured into a crucible. Later, polyethylene glycol 600 (PEG 600) was added to this mixture. Samples were adjusted to pH 11 values using NaOH solution. Accordingly, experiments were made at 180, 200 and 250 oC, respectively. The other parameters, were fixed as reaction time 24 h and pH value 11. The structural and morphological properties of NiFe2
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5

Jatkar, Kasturie. "Measuring magnetization in Nickel Ferrite samples using odd and even harmonics." Thesis, Uppsala universitet, Molekyl- och kondenserade materiens fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-411159.

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6

Okatan, Mahmut Baris. "Microstructure Development In Nickel Zinc Ferrites." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12606924/index.pdf.

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Nickel zinc ferrites (NZF) have been considered as one of the basic components in high frequency electromagnetic applications especially in the field of telecommunications. In the present study, the aim was to produce high quality nickel zinc ferrite ceramics at low soaking temperatures. For this purpose, conventional ceramic manufacturing method based on mixed oxide precursors was followed using calcium fluoride, CaF2, as sintering additive. During the sintering studies, it was noticed that both the microstructure and the electromagnetic properties of the NZF ceramics were modified to a gre
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7

Karakas, K. Z., R. Boncukcuoglu, I. H. Karakas, and M. T. Yılmaz. "The Effect of Calcination Temperature in NiFe2O4 Nanoparticles Synthesis with Microvawe Combustion Method." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35025.

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Magnetic ferrites are a group of technologically important magnetic materials. Synthesis of nanocrystalline spinel ferrite has been investigated intensively in recent years due to their potential applications in high-density magnetic recording, microwave devices, and magnetic fluids In this study, NiFe2O4 nano particles were prepared with microvawe combustion methods. In experiments, samples obtained by microvawe method were calcined at various temperatures. The structural and morphological properties of NiFe2O4 nano particles was determined by X-ray powder diffraction (XRD) and Scanning
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8

Neumann, James 1958. "THE INITIATION AND PROPAGATION OF HERTZIAN AND RADIAL CRACKS IN NICKEL-ZINC FERRITE." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/276523.

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This investigation was initiated by IBM to determine the types of cracks formed in hot-isostatic-pressed (HIP) Ni-Zn ferrite under impact and static loading conditions. A 1/8-inch tungsten carbide (WC) ball was used to apply the load in both cases. The impact loading condition was accomplished by dropping the WC ball from various heights between 40 and 200 cm. The static loading condition was accomplished by applying loads of 10 kg, 15 kg, and 30 kg on a Rockwell Hardness Tester. The response of HIP Ni-Zn ferrite to impact and static loading was elastic/plastic yielding permanent indentations.
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9

Brachwitz, Kerstin. "Defekt-induzierte Leitungsmechanismen und magnetische Eigenschaften spinellartiger Ferrite." Doctoral thesis, Universitätsbibliothek Leipzig, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-141251.

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Im Rahmen dieser Arbeit wurde der Einfluss von Defekten auf die Eigenschaften von Ferrit-Dünnfilmen untersucht. Die Dünnfilme wurden mit Hilfe von gepulster Laserabscheidung bei verschiedenen Züchtungsparametern hergestellt. Durch Variation der Substrattemperatur und des Sauerstoffpartialdrucks wurden Dünnfilme verschiedener kristalliner Qualität gezüchtet. Diese wurden hinsichtlich ihrer chemischen Komposition mit Hilfe von energie-dispersiver Röntgenspektroskopie und Röntgenphotoelektronenspektroskopie untersucht. Durch Korrelation der Ergebnisse mit Messungen zum zirkularen magnetischen Rön
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10

Kenfack, Flaurance. "Complex oxides of the system Cu-Ni-Fe-O: synthesis parameters, phase formation and properties." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2004. http://nbn-resolving.de/urn:nbn:de:swb:14-1105366432765-06401.

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This thesis describes the convenient routes and the preparation conditions (temperature, oxygen partial presssure) which lead to the formation of single phase materials within the quaternary system Cu-Ni-Fe-O. The investigated compositions are the solid solutions CuxNi1-xFe2O4, the ferrites occurring in the phase triangle Cu0.5Ni0.5Fe2O4 -Cu0.9Fe2.1O4 - Cu0.5Fe2.5O4 and some copper-nickel oxide solid solutions. Three synthesis routes have been used, namely (i) the preparation and the thermal decomposition of freeze-dried carboxylate precursors, (ii) the preparation and the oxidation of interme
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11

Bastien, Samuel. "Nanopoudres de ferrite de nickel produites par plasma inductif et analyse in situ de leur comportement thermochimique." Thèse, Université de Sherbrooke, 2017. http://hdl.handle.net/11143/10973.

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Des nanoparticules de ferrite de nickel ont été produites par une technique de plasma induc-tif à jet de solution. En contrôlant le ratio Ni/(Ni+Fe) dans la solution de précurseurs, une grande gamme de nanoparticules monophasées de ferrite de nickel NixFe3-xO4-δ (0 ≤ x ≤ 1) peuvent être produites, ainsi que des nanoparticules multiphasées de NiFe2O4 + (Ni,Fe)O. Des nanoparticules avec deux types de morphologie peuvent être obtenues dépendant de l’endroit où elles sont recueillies dans le réacteur : des octaèdres tronqués facettés, ayant une taille moyenne de 30 nm, ou un petit agglomérat de fo
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12

Karakas, Z. K., R. Boncukcuoglu, and I. H. Karakas. "The Effects of Fuel Type Above Magnetic Properties of the Nickel Ferrite Nanoparticles Synthesized with Microwave Method." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35275.

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The synthesis of nickel ferrite nanoparticles was used various fuel substances such as glycine, urea and citric acid. The mixture prepared in stoichiometric rates was put in to the kitchen type microwave oven. In the end of reaction time was obtained a brown-black solid. The obtained solid was characterized with X-Ray Powder Diffraction and Scanning Electron Microscopy. The results of this analysis showed that all of the obtained particles have got nano-size particle size distribution. To determine the magnetic properties of the nanoparticles were analyzed by using a vibrating sample magnetome
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13

Karakas, Z. K., R. Boncukcuoglu, and I. H. Karakas. "The Effects of Fuel Type Above Adsorbtive Properties of the Nickel Ferrite Nanoparticles synthesized with Microwave Method." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35271.

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In this study, we were able to develop a new and practical method for the synthesis of the NiFe2O4 nanoparticles. The synthesis of nickel ferrite nanoparticles was used various fuel substances such as glycine, urea and citric acid. The synthesis mixture prepared in stoichiometric rates was put in to the kitchen type microwave oven. In the end of reaction time was obtained a brown-black solid. The obtained solid was characterized with X-Ray Powder Diffraction and Scanning Electron Microscopy. The results of this analysis showed that all of the obtained particles has got nano-size particle size
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14

Le, Guen Emmanuel. "Élaboration et réalisation de matériaux magnétodiélectriques pour la miniaturisation d'antennes en bande UHF." Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S016.

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La miniaturisation des antennes s'accompagne d'une dégradation leurs performances (bande passante, gain, efficacité), surtout avec l'utilisation de substrats matériaux diélectriques. Pour relever le défi « intégration / performances », la conception de nouveaux matériaux tels que les ferrites magnétoélectriques constitue une alternative des plus prometteuses. Ce travail met en avant les principaux paramètres à l'élaboration de ferrite spinelle par coprécipitation. Un traitement thermique modéré a permis l'obtention de céramiques semi poreuses pour la montée en fréquence. En parallèle, l'anisot
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15

Santos, Cochiran Pereira dos. "Síntese e caracterização de NiFe2O4 e efeitos da dopagem na magnetização de saturação." Universidade Federal de Sergipe, 2011. http://ri.ufs.br:8080/xmlui/handle/123456789/3515.

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The ferrites are a wide class of ferrimagnetic materials with great technological importance and are studied extensively for many decades. Their remarkable magnetic characteristics make it an element often used in induction transformers by his high magnetic permeability, high values of saturation magnetization and low coercivity, resulting in smaller losses in their hysteresis loops. In this work were characterized pure nickel ferrite (NiFe2O4), a soft magnetic material where the magnetic properties depend on the nature of the ions, their charges and their distribution among the tetrahedral an
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16

Lebourgeois, Richard. "Elaboration et caractérisations de ferrite spinelle de nickel-zinc sous forme de céramique et de monocristaux pour applications aux hyperfréquences." Grenoble INPG, 1989. http://www.theses.fr/1989INPG0097.

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Afin d'ameliorer les proprietes absorbantes des ferrites spinelles ni-zn, des plaquettes de composition chimique ni#0#,#4#5zn#0#,#5#5fe#2o#4 ont ete synthetisees selon deux methodes: la premiere est une reaction en sels fondus a partir de fe#2o#3 micace en poudre et permet d'obtenir des plaquettes de 10 a 30 microns, la seconde est une reaction d'echange a partir de kfe#1#1o#1#7 monocristallin et permet d'obtenir des plaquettes de 50 microns a plusieurs millimetres. Grace a une technique de mesure en ligne coaxiale, on a mesure la permeabilite complexe des plaquettes de ferrite spinelle en fon
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17

Cassayre, Laurent. "Mécanismes de dégradation électrochimique de matériaux d'anodes pour l'électrolyse de l'aluminium." Toulouse 3, 2005. http://www.theses.fr/2005TOU30040.

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L'objectif de ce travail était de comprendre les mécanismes de dégradation d'un matériau d'anode destiné à être utilisé pour la production de l'aluminium par électrolyse dans un mélange cryolithique fondu à 960°C. Une anode inerte vis-à-vis de la réaction électrochimique permettrait de remplacer le dégagement de CO2, produit de la réaction anodique classique, par celui de l'oxygène. Le matériau étudié est un composite cermet constitué de deux phases oxydes à base de ferrite de nickel et d'un alliage cuivre-nickel. La démarche a consisté à étudier la dégradation des différents composants puis c
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18

Bellefleur, Alexandre. "Cinétique de réaction et solubilité des produits de corrosion dans les conditions physico-chimiques du circuit primaire des réacteurs à eau sous pression (REP)." Phd thesis, Toulouse 3, 2012. http://thesesups.ups-tlse.fr/1767/.

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L'objectif du travail présenté est d'acquérir expérimentalement de nouvelles données thermodynamiques sur les espèces qui constituent les produits de corrosion présents dans le circuit primaire des REP. Le volet expérimental de cette étude se focalise sur deux phases solides du nickel : l'oxyde de nickel NiO (ou bunsenite) et le ferrite de nickel NiFe2O4. La vitesse de dissolution de l'oxyde de nickel a été mesurée jusqu'à 130°C en milieu acide (pH 3 à 5). Un modèle cinétique a été utilisé afin de décrire les vitesses de dissolution mesurées expérimentalement. Ce modèle a permis de déterminer
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19

Rigo, Caroline. "PREPARAÇÃO DO COMPÓSITO FERRITA DE NÍQUEL/NANOTUBOS DE CARBONO POR MICRO-ONDAS PARA USO NA REAÇÃO DE FOTO-FENTON." Universidade Federal de Santa Maria, 2015. http://repositorio.ufsm.br/handle/1/7999.

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Fundação de Amparo a Pesquisa no Estado do Rio Grande do Sul<br>In this study, the synthesis of the nickel ferrite composite/carbon nanotubes was accomplished through two different routes: conventional solvothermal method and solvothermal method assisted by microwave. The influence of the synthesis route into material's physical properties was investigated. Furthermore, the nickel ferrite, without carbon nanotubes presence, was synthesized by the solvothermal method assisted by microwave. The obtained materials were characterized by X-Ray Diffraction (XRD), Fourier Transform Infrared spectrosc
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20

Basaran, Yanki. "Studies On The Development Of Magnetoelectric Ceramic Composites." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609612/index.pdf.

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The aim of this thesis work was to develop magnetoelectric (ME) composites consisting of piezoelectric and magnetostrictive components. The piezoelectric constituent was selected as a PZT ceramic modified by strontium, bismuth and manganese. The magnetostrictive phase was nickel ferrite (NF) ceramic doped by cobalt, copper and manganese. The properties of component phases were optimized in order to enhance the ME effect in the composite. In the first part of the thesis, effects of sintering temperature on the dielectric and piezoelectric properties of PZT and on the electrical and magnetic pr
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21

Fracari, Tiago Ost. "Síntese e caracterização de nanopartículas magnéticas de ferrita de níquel para detecção de ácido ascórbico e peróxido de hidrogênio." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2018. http://hdl.handle.net/10183/181184.

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Neste estudo apresenta-se a síntese de duas amostras de nanopartículas de ferrita de níquel, denominadas C-NiFe2O4 e NiFe2O4, através de um método simples, de baixo custo e ambientalmente amigável. Estudos morfológicos, estruturais, eletrônicos, ópticos e magnéticos foram realizados com o intuito de caracterizar as propriedades desses materiais para que possibilitassem, além de maior grau de conhecimento, sua aplicação como sensores colorimétricos para detecção de ácido ascórbico e peróxido de hidrogênio. Mediante a análise térmica dos precursores, foi possível determinar os intervalos de temp
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22

Bellefleur, Alexandre. "Cinétique de réaction et solubilité des produits de corrosion dans les conditions physico-chimiques du circuit primaire des réacteurs à eau sous pression (REP)." Phd thesis, Université Paul Sabatier - Toulouse III, 2012. http://tel.archives-ouvertes.fr/tel-00767055.

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L'objectif du travail présenté est d'acquérir expérimentalement de nouvelles données thermodynamiques sur les espèces qui constituent les produits de corrosion présents dans le circuit primaire des REP. Le volet expérimental de cette étude se focalise sur deux phases solides du nickel : l'oxyde de nickel NiO (ou bunsenite) et le ferrite de nickel NiFe2O4. La vitesse de dissolution de l'oxyde de nickel a été mesurée jusqu'à 130°C en milieu acide (pH 3 à 5). Un modèle cinétique a été utilisé afin de décrire les vitesses de dissolution mesurées expérimentalement. Ce modèle a permis de déterminer
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23

Kuper, Michael W. "Investigations Near the Fusion Boundary of Grade 91 Steel Dissimilar Metal Welds with Nickel Based Filler Metals." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1543505600533312.

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24

BENLOUCIF, MOHAMMED-RIDA. "Oxydes de type k#2nif#4, ferrite bicalcique ca#2fe#2o#5 et nd#2banio#5 a base de fer et de nickel : structure, proprietes electriques et magnetiques." Caen, 1992. http://www.theses.fr/1992CAEN2002.

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Plusieurs oxydes de structure type k#2nif#4 de formulation la#2#(#x#+#y)sr#x#+#yni#1##y fe#yo#4##(#x#/#2#)#+# ont ete prepares. L'etat d'oxydation du fer et du nickel a ete determine par analyse chimique et spectroscopie mossbauer. Un ordre antiferromagnetique a ete observe a t=200 k pour ces phases. Les proprietes de transport electronique de ces composes sont lies etroitement a la non-stchiometrie en oxygene et aux proprietes magnetiques. Cette relation est discutee et interpretee sur la base de deux modeles de diagramme d'energie. Sur la seconde famille de composes etudies ca#2fe#2##xm#xo#5
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Emo, Jonathan. "Etude expérimentale et par simulation Monte Carlo des transformations de phase dans la ferrite des aciers austéno-ferritiques et de leurs alliages modèles." Rouen, 2014. http://www.theses.fr/2014ROUES054.

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Les aciers inoxydables austéno-ferritiques constituants les coudes moulés du circuit primaire des centrales nucléaires de deuxième génération, vieillissent aux températures de service (285°C-323°C). Ceci se traduit par une augmentation de leur dureté et une baisse de leur résilience. L’évolution de ces propriétés est attribuée aux transformations de phases qui opèrent dans la ferrite. S'il est admis que la composition de l’acier influe sur l’évolution de ces propriétés (les aciers moins riches en Ni et Mo sont moins sensibles au vieillissement), l’origine de ces différences n’est pas clairemen
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SILVEIRA, Angélica Soares da. "Aproveitamento das Cinzas da Casca de Arroz como Suporte Catalítico Heterogêneo na Síntese do Biodiesel por Reação de Hidroesterificação." Universidade Federal de Campina Grande, 2014. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/809.

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Submitted by Deyse Queiroz (deysequeirozz@hotmail.com) on 2018-05-25T14:22:20Z No. of bitstreams: 1 ANGÉLICA SOARES DA SILVEIRA - DISSERTAÇÃO PPGSA PROFISSIONAL 2014..pdf: 908548 bytes, checksum: 27e82fc2df5f8190bf2ee0b7b20117e8 (MD5)<br>Made available in DSpace on 2018-05-25T14:22:20Z (GMT). No. of bitstreams: 1 ANGÉLICA SOARES DA SILVEIRA - DISSERTAÇÃO PPGSA PROFISSIONAL 2014..pdf: 908548 bytes, checksum: 27e82fc2df5f8190bf2ee0b7b20117e8 (MD5) Previous issue date: 2014-08<br>A tendência do aproveitamento integral de resíduos da agroindústria, tais como: a casca de arroz, as fibras da c
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Gonçalves, Nizomar de Sousa. "Utilização da água de coco em pó na preparação de nanopartículas de ferritas." reponame:Repositório Institucional da UFC, 2007. http://www.repositorio.ufc.br/handle/riufc/9793.

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GONÇALVES, Nizomar de Sousa. Utilização da água de coco em pó na preparação de nanopartículas de ferritas. 2007. 46 f. Dissertação (Mestrado em Física) - Programa de Pós-Graduação em Física, Departamento de Física, Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2007.<br>Submitted by Edvander Pires (edvanderpires@gmail.com) on 2014-11-13T22:17:28Z No. of bitstreams: 1 2007_dis_nsgoncalves.pdf: 1509521 bytes, checksum: 892d11d7fe93897c2f435078c8f4175a (MD5)<br>Approved for entry into archive by Edvander Pires(edvanderpires@gmail.com) on 2014-11-14T17:51:45Z (GMT) No. of bitstreams
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Hawkes, Joshua Mahlon. "The Simulation and Study of Conditions Leading to Axial Offset Anomaly in Pressurized Water Reactors." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/7612.

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Axial offset anomaly (AOA) in pressurized water reactors (PWR) refers to deviation of the measured neutron flux in the top half of the core from the predicted values. Among other difficulties, AOA reduces the shutdown margin, and may force the plant to reduce power output. AOA is believed to be caused by three related phenomena occurring in the core while operating at full power: sub-cooled nucleate boiling concentrated mainly in the upper half of the core, corrosion product deposition on the cladding surface (crud), and the deposition of boron within the porous crud layer in regions of vigo
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Lesik, S. M., and I. M. Ivanenko. "Nickel ferrites and its catalytic properties." Thesis, Sumy State University, 2018. http://essuir.sumdu.edu.ua/handle/123456789/67686.

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Gonçalves, Nizomar de Sousa. "Síntese e caracterização de nanopartículas de ferritas de níquel e de colbalto preparadas pelo método sol-gel proteico." reponame:Repositório Institucional da UFC, 2011. http://www.repositorio.ufc.br/handle/riufc/9794.

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GONÇALVES, Nizomar de Sousa. Síntese e caracterização de nanopartículas de ferritas de níquel e de colbalto preparadas pelo método sol-gel proteico. 2011. 119 f. Tese (Doutorado em Física) - Programa de Pós-Graduação em Física, Departamento de Física, Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2011.<br>Submitted by Edvander Pires (edvanderpires@gmail.com) on 2014-11-14T18:02:46Z No. of bitstreams: 1 2011_tese_nsgoncalves.pdf: 10518347 bytes, checksum: e003b7eaec2ac72b848255b9299513ce (MD5)<br>Approved for entry into archive by Edvander Pires(edvanderpires@gmail.com) on 2014-
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Corso, Stéphanie. "Élaboration et caractérisation de céramiques à base de ferrites de nickel : étude de leurs propriétés en vue de la conception d'anodes inertes de type oxydes ou cermets destinées à l'électrolyse de l'aluminium." Toulouse 3, 2004. http://www.theses.fr/2004TOU30305.

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GonÃalves, Nizomar de Sousa. "Sintese e caracterizaÃÃo de nanoparticulas de ferritas de nÃquel e de colbalto preparadas pelo mÃtodo sol-gel proteico." Universidade Federal do CearÃ, 2011. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=6787.

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CoordenaÃÃo de AperfeiÃoamento de NÃvel Superior<br>Este trabalho apresenta o estudo da sÃntese de nanopartÃculas de ferritas de nÃquel e de cobalto usando o mÃtodo sol-gel proteico. Inicialmente, Ã resgatado o mÃtodo do grÃfico de Williamson-Hall na anÃlise dos dados de difraÃÃo de raios X. Este mÃtodo permite calcular o tamanho mÃdio de partÃcula e a microdeformaÃÃo. Ferritas de nÃquel apresentaram tamanhos de partÃculas que crescem com o aumento da temperatura de calcinaÃÃo. NanopartÃculas de ferrita de nÃquel foram caracterizadas por espectroscopia MÃssbauer. As amostras calcinadas a 400 Â
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Hochepied, Jean-François. "Précipitation d'hydroxydes et d'oxydes métalliques en solution aqueuse : vers le contrôle morphologique d'objets multi-échelles." Habilitation à diriger des recherches, Université Paris-Diderot - Paris VII, 2009. http://tel.archives-ouvertes.fr/tel-00574750.

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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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35

GonÃalves, Nizomar de Sousa. "UtilizaÃÃo da Ãgua de coco em pà na preparaÃÃo de nanopartÃculas de ferritas." Universidade Federal do CearÃ, 2007. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=5247.

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CoordenaÃÃo de AperfeiÃoamento de NÃvel Superior<br>Este trabalho à dedicado aos estudos da preparaÃÃo e caracterizaÃÃo das ferritas de nÃquel e cobalto. Estas ferritas foram sintetizadas pelo processo de sol-gel em suspensÃo de Ãgua de coco liofilizada (ACP) fabricada no CearÃ. Este mÃtodo de sÃntese permitiu obter de forma eficiente nanopartÃculas de ferritas. As amostras foram calcinadas durante 4 horas a 400, 600, 800, 1000 e 1200 ÂC. Um estudo preliminar da ferrita de cobalto variando a concentraÃÃo da Ãgua de coco acima da sua concentraÃÃo micelar crÃtica (8,3 mmol/litro) mostrou como is
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Santos, Paulo Roberto Cunha dos. "S?ntese, sinteriza??o e caracteriza??o de ferrita de n?quel." Universidade Federal do Rio Grande do Norte, 2014. http://repositorio.ufrn.br:8080/jspui/handle/123456789/18676.

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Made available in DSpace on 2015-03-03T15:43:03Z (GMT). No. of bitstreams: 1 PauloRCS_DISSERT.pdf: 5184228 bytes, checksum: d3e31e6fed97c72238a19b42897cf9b0 (MD5) Previous issue date: 2014-05-27<br>Universidade Federal do Rio Grande do Norte<br>In this work we obtain nickel ferrite by the combustion synthesis method whcih involves synthesising in an oven at temperatures of 750oC, 950oC and 125oC. The precursors oxidizing used were nickel nitrate, ferric as an oxidizing and reducing urea (fuel). After obtaining the mixture, the product was deagglomerated and past through a 270 mesh siev
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Sandford, Andrew Robert Brian. "Effect of manganese and nickel on the cleavage fracture strength of ferritic weld metal." Thesis, London Metropolitan University, 1990. http://repository.londonmet.ac.uk/3058/.

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All weld metal test pieces were produced from two commercial and six experimental 7016 type electrodes, each having different contents of manganese and nickel. These were tested in three point bending over a range of depressed temperatures in a cryostatic cell of the author’s devising. Notched samples were used to obtain values for the cleavage fracture strength. This was calculated by reference to slip line field theory from the fracture load at the test temperature where fracture was first coincident with general yielding. The commercial electrodes were first tested in the as welded conditio
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Smith, Thomas. "Studies of p-type semiconductor photoelectrodes for tandem solar cells." Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/14522.

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Photoelectrodes and photovoltaic devices have been prepared via multiple thin film deposition methods. Aerosol assisted chemical vapour deposition (AACVD), electrodeposition (ED), chemical bath deposition (CBD) and doctor blade technique (DB) have been used to deposit binary and ternary metal oxide films on FTO glass substrates. The prepared thin films were characterised by a combination of SEM (Scanning Electron Microscopy), powder X-ray diffraction, mechanical strength tests and photochemical measurements. Nickel oxide (NiO) thin films prepared by AACVD were determined to have good mechanica
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Sousa, Marcelo Henrique. "Propriétés magnétiques et magnéto-optiques de fluides magnétiques à base de nanoparticules de ferrites de nickel, de cuivre et de zinc." Paris 6, 2003. http://www.theses.fr/2003PA066591.

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40

Hajjaji, Mohamed el. "Caractérisation et simulation des joints de phases C. C. -C. F. C. : applications à des alliages Fe-Cr-Ni de différentes puretés." Lyon 1, 1986. http://www.theses.fr/1986LYO10015.

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Presentation des resultats de simulation des joints de phase entre structures cubiques centrees (c. C), cubiques et cubiques a faces centrees (c. F. C. ). Calcul des indices de coincidence entre les phases cubiques centrees et cubiques a faces centrees liees par une famille de relations d'orientation cristallographique. Etude experimentale des joints de phases entre structures c. C-c. F. C sur des alliages fe-ni-cr. La presence d'aluminium dans ces alliages aboutit a l'apparition de certains precipites. La diffusion des impuretes c ou s dans des alliages de tres haute purete provoque un arrang
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41

Martin, Cabanas Bruna. "Comportement des produits de corrosion dans le circuit primaire des centrales REP - sorption du cobalt et du nickel sur des ferrites représentatifs." Phd thesis, Université Paris Sud - Paris XI, 2010. http://tel.archives-ouvertes.fr/tel-00595061.

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La corrosion des parties métalliques du circuit primaire des centrales REP engendre la formation de produits de corrosion. Ceux-ci peuvent circuler dans le circuit primaire sous forme de particules colloïdales ou d'espèces dissoutes qui peuvent être activées lors de leur passage sous flux puis adhérer sur les parties métalliques des circuits et sur les gaines des assemblages combustible. Le dépôt des particules ou d'ions activés sur les zones hors flux est alors responsable de la contamination surfacique. Afin d'avoir une meilleure maîtrise de la contamination, la caractérisation (surface spéc
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Martin, Cabañas Bruna. "Comportement des produits de corrosion dans le circuit primaire des centrales REP : sorption du cobalt et du nickel sur des ferrites représentatifs." Paris 11, 2010. http://www.theses.fr/2010PA112245.

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La corrosion des parties métalliques du circuit primaire des centrales REP engendre la formation de produits de corrosion. Ceux-ci peuvent circuler dans le circuit primaire sous forme de particules colloïdales ou d'espèces dissoutes qui peuvent être activées lors de leur passage sous flux puis adhérer sur les parties métalliques des circuits. Le dépôt des particules activées sur les zones hors flux est alors responsable de la contamination surfacique. Ces particules peuvent également interagir avec les espèces ioniques dissoutes dans le milieu primaire. Alin d'avoir une meilleure maîtrise de l
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43

Al-Motasem, Al-Asqalani Ahmed Tamer. "Nanoclusters in Diluted Fe-Based Alloys Containing Vacancies, Copper and Nickel: Structure, Energetics and Thermodynamics." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-89355.

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The formation of nano–sized precipitates is considered to be the origin of hardening and embrittlement of ferritic steel used as structural material for pressure vessels of nuclear reactors, since these nanoclusters hinder the motion of dislocations within the grains of the polycrystalline bcc–Fe matrix. Previous investigations showed that these small precipitates are coherent and may consist of Cu, Ni, other foreign atoms, and vacancies. In this work a combination of on–lattice simulated annealing based on Metropolis Monte Carlo simulations and off–lattice relaxation by Molecular Dynamics is
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44

Junior, Amilton Barbosa Botelho. "Recuperação de níquel e cobalto a partir de lixiviado de níquel laterí­tico utilizando resinas quelantes e processo de pré-redução." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-25032019-091140/.

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Níquel laterítico compõe 70% das reservas disponíveis do metal. A produção de níquel a partir dessas reservas representa 40%, dos quais é possível extrair também cobre e cobalto. Isso ocorre devido ao alto teor de impurezas, principalmente ferro. Com a crescente demanda desses metais, o uso das reservas de lateritas de níquel passou a ser mais profundamente investigado, assim como o desenvolvimento de processos hidrometalúrgicos. Nesse caso, o íon férrico prejudica a recuperação do níquel e do cobalto, uma vez que em trocas iônicas esse metal compete na ocupação dos sítios catiônicos. Em proce
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Abbali, Zineb. "Etude de la cristallisation de ferrites spinelles dans des verres borates." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb376110731.

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Lundberg, Daniel, Filip Wilson, Hjalmar Gunnarsson, Leo Sjörén, Robin Xu, and Erik Djurberg. "Long term aging and creep exposure for advanced heat resistant alloys : A phase analysis." Thesis, Uppsala universitet, Institutionen för materialvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-446407.

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This project was ordered by Sandvik Materials Technology and was performed by a group of students at Uppsala university. The purpose of the project was to study precipitation behavior and structure stability in six advanced heat resistant alloys. Each sample were subjected to a creep rupture test in 600 or 700°C depending on the alloy type. Two parts of each alloy where examined; one part which had been affected by creep and another part which was unaffected by creep. A literature study was performed first to gain knowledge of the scientific theory utilized in this project, namely creep, preci
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Karlsson, Lovisa. "Waste Water Treatment - A Case Study : Removal of Ni, Cu and Zn through precipitation and adsorption." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-26130.

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Waste water containing high concentrations of dissolved metals were delivered to the environmental company SAKAB. After standard treatment procedure, involving regulation of pH and addition of flocculation agents, the water still contained nickel concentrations of 26 mg/l. Since SAKAB’s regulatory concentration limit value for nickel in outgoing water is 0.5 mg/l, further treatment was necessary. According to the supplier of the water, a complexing agent similar to EDTA had been added to the water. The aim of this study was to decrease concentrations of nickel, zinc and copper. One part of thi
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Pappas, Adlreburg Nickolas. "To Make Iron of Iron : A Comprehensive Analytical Study of Spade Shaped Iron Bars." Thesis, Stockholms universitet, Arkeologiska forskningslaboratoriet, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-145694.

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This thesis aims to provide adequate analytical information on the spade shaped iron bars of Norrland and central Sweden. While their significance has been thoroughly debated for decades, analytical research on them has been confined to cases of single artefacts or theoretical interpretations of their value, meaning and origin. In this study a comprehensive approach is taken into consideration. Based on X-Ray fluorescence (XRF), scanning electron microscopy (SEM) and metallographical analysis this thesis seeks to facilitate new interpretations on quality, production centres and usage based on
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Tesařová, Hana. "Strukturní a mechanické charakteristiky niklových litin s kuličkovým grafitem." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-233891.

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The aim of this dissertation work is the evaluation of the influence of nickel alloying on the structure and mechanical properties, both monotonic and dynamic, of nodular cast iron with ferritic and bainitic matrix. Two chock melts with 0.5 and 2.7 % Ni were used to study the nickel influence. The quantitative evaluation of structure of these melts using image analysis was done and basic tensile mechanical properties were determined. Subsequently, the time optimization of two-stage ferritic annealing and isothermal austempered heat treatment at 375 °C was performed with the aim to obtain optim
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Ying-HaoWang and 王盈皓. "The Effects of Nickel Substitution on Bismuth Ferrite." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/20251920478389202766.

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