{"id":109377,"date":"2018-03-11T10:34:48","date_gmt":"2018-03-11T10:34:48","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/propiedades-magneticas-de-nanoparta%c2%adculas-de-ferritas-mfe2o4-m-elemento-de-transicion\/"},"modified":"2018-03-11T10:34:48","modified_gmt":"2018-03-11T10:34:48","slug":"propiedades-magneticas-de-nanoparta%c2%adculas-de-ferritas-mfe2o4-m-elemento-de-transicion","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/quimica\/propiedades-magneticas-de-nanoparta%c2%adculas-de-ferritas-mfe2o4-m-elemento-de-transicion\/","title":{"rendered":"Propiedades magn\u00e9ticas de nanopart\u00edculas de ferritas mfe2o4 (m= elemento de transici\u00f3n)"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Veronica Blanco Gutierrez <\/strong><\/h2>\n<p>Propiedades magn\u00e9ticas de nanopart\u00edculas de ferritas mfe2o4 (m: elemento de transici\u00f3n)   la nanotecnolog\u00eda es uno de los campos cient\u00edficos m\u00e1s estudiados actualmente debido a las distintas propiedades que presentan los materiales en la escala nanom \u00e9trica respecto de los preparados en la escala microm\u00e9trica de igual composici\u00f3n. En este sentido, las ferritas presentan un amplio campo de investigaci\u00f3n en cuanto a su comportamiento magn\u00e9tico. Por ejemplo, mientras que las part\u00edculas microm\u00e9tricas  de ferrita de zn muestran antiferromagnetismo, cuando se preparan en la escala nanom\u00e9trica presentan comportamiento superparamagn\u00e9tico como consecuencia de un ordenamiento interno ferrimagn\u00e9tico. Del mismo modo, la ferrita de co y ferrita de ni pres entan comportamiento superparamagn\u00e9tico en la escala nanom\u00e9trica con un ordenamiento ferrimagn\u00e9tico interno distinto al que presentan en la escala microm\u00e9trica. Esto es debido a que en la escala nanom\u00e9trica se pueden obtener  distribuciones cati\u00f3nica s en la estructura espinela (g.E fd-3m), distintas a las que presentan en la escala microm\u00e9trica y por tanto, el momento magn\u00e9tico neto de estos materiales que es consecuencia de la compensaci\u00f3n de las subredes magn\u00e9ticas, es funci\u00f3n de esta distribu ci\u00f3n cati\u00f3nica. El grado de inversi\u00f3n indica la distribuci\u00f3n cati\u00f3nica en la estructura espinela toma un valor entre 0 y 1. en este trabajo, se presenta la preparaci\u00f3n de ferritas de zn, de co y de ni, con tama\u00f1o de part\u00edcula nanom\u00e9trico mediante el m\u00e9todo solvothermal que de un modo sencillo permite modificar los par\u00e1metros de s\u00edntesis para obtener part\u00edculas de distinto tama\u00f1o y grado de inversi\u00f3n. La distribuci\u00f3n cati\u00f3nica se estudi\u00f3 mediante varias t\u00e9cnicas como difracci\u00f3n de neutrones a tem peratura ambiente, espectroscop\u00eda m\u00ed\u00b6ssbauer bajo campo aplicado y espectroscop\u00eda de absorci\u00f3n de rayos x. Los valores obtenidos de este par\u00e1metro sirvieron para la posterior interpretaci\u00f3n del comportamiento magn\u00e9tico. La caracterizaci\u00f3n estructural y microstructural de las muestras se realiz\u00f3 mediante difracci\u00f3n de rayos x y microscop\u00eda electr\u00f3nica y sus propiedades magn\u00e9ticas se estudiaron mediante medidas de magnetizaci\u00f3n frente a campo aplicado y medidas de susceptibilidad magn\u00e9tica que en a lgunos casos se realizaron hasta 700 k. las muestras de ferrita de ni son las que presentan los valores de momento superparamagn\u00e9tico efectivo m\u00e1s altos debido probablemente a la presencia de interacciones entre part\u00edculas de car\u00e1cter dipolar m\u00e1s int<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Propiedades magn\u00e9ticas de nanopart\u00edculas de ferritas mfe2o4 (m= elemento de transici\u00f3n)<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Propiedades magn\u00e9ticas de nanopart\u00edculas de ferritas mfe2o4 (m= elemento de transici\u00f3n) <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Veronica Blanco Gutierrez <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Complutense de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 22\/06\/2011<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Regino Saez Puche<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Miguel angel Alarios franco <\/li>\n<li>olivier robert marcel Toulemonde (vocal)<\/li>\n<li>ricard March raurell (vocal)<\/li>\n<li>maite Insausti pe\u00f1a (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Veronica Blanco Gutierrez Propiedades magn\u00e9ticas de nanopart\u00edculas de ferritas mfe2o4 (m: elemento de transici\u00f3n) la nanotecnolog\u00eda es [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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