{"id":19449,"date":"2002-11-10T00:00:00","date_gmt":"2002-11-10T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/preparacion-y-propiedades-magneticas-de-parta%c2%adculas-uniformes-de-fe-co-obtenidas-a-partir-de-goetita\/"},"modified":"2002-11-10T00:00:00","modified_gmt":"2002-11-10T00:00:00","slug":"preparacion-y-propiedades-magneticas-de-parta%c2%adculas-uniformes-de-fe-co-obtenidas-a-partir-de-goetita","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/preparacion-y-propiedades-magneticas-de-parta%c2%adculas-uniformes-de-fe-co-obtenidas-a-partir-de-goetita\/","title":{"rendered":"Preparaci\u00f3n y propiedades magn\u00e9ticas de part\u00edculas uniformes de fe-co obtenidas a partir de goetita"},"content":{"rendered":"<h2>Tesis doctoral de <strong>  N\u00fa\u00f1ez Alvarez Nuria Ofelia <\/strong><\/h2>\n<p>La presente tesis doctoral tiene como objetivo la preparaci\u00f3n de part\u00edculas elipsoidales estables de fe-co, con alta relaci\u00f3n axial y tamam\u00f1o de part\u00edcula inferior a 200 nm, por su gran inter\u00e9s como materiales para registro magn\u00e9tico avanzado.  las part\u00edculas elipsoidales de fe-co fueron obtenidas por reducci\u00f3n en condiciones apropiadas de precursores basados en goetita (alfa, feooh). el mecanismo de formaci\u00f3n de las part\u00edculas de goetita en soluci\u00f3n y como \u00e9ste condiciona las caracter\u00edsticas finales de las part\u00edculas resultantes constituye uno de los aspectos m\u00e1s destecados de la presente tesis.  para el tama\u00f1o de part\u00edcula estudiado (&lt;200 nm), necesario para sistemas de registro magn\u00e9tico de alta densidad, las part\u00edculas han de protegerse para mantener la morfolog\u00eda durante la reducci\u00f3n con h2 a temperaturas pr\u00f3ximas a 450\u00c2\u00bac. Esto ha sido llevado a cabo mediante dopado con aluminio \u00f3 recubrimientos con \u00abhidr\u00f3xidos de al o ytrio\u00bb. Este es otro de los aspectos importantes del presente estudio ya que muestra como el aluminio dopado se encuentra fundamentalmente en las capas superiores de la goetita durante el proceso de s\u00edntesis, lo que contribuye a la protecci\u00f3n de las mismas. las muestras recubiertas con \u00abhidr\u00f3xidos de aluminio e ytrio\u00bb conlleva una mejora en las propiedades magn\u00e9ticas que se manifiesta fundamentalmente en los valores del campo coercitivo. Este efecto es m\u00e1s sobresaliente en el caso del ytrio.  por \u00faltimo, la adici\u00f3n a la goetita de cobalto (hasta un 20% en peso) resulta en un enaltecimiento en las propiedades magn\u00e9ticas, con un valor del campo coercitivo de 1550 oe y una imanaci\u00f3n de saturaci\u00f3n de 160 emu\/g. Estos valores, entre los m\u00e1s altos reportados en la bibliograf\u00eda, confieren unas caracter\u00edsticas excelentes al manterial obtenido para su uso en registro magn\u00e9tico.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Preparaci\u00f3n y propiedades magn\u00e9ticas de part\u00edculas uniformes de fe-co obtenidas a partir de goetita<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Preparaci\u00f3n y propiedades magn\u00e9ticas de part\u00edculas uniformes de fe-co obtenidas a partir de goetita <\/li>\n<li><strong>Autor:<\/strong>\u00a0  N\u00fa\u00f1ez Alvarez Nuria Ofelia <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Aut\u00f3noma de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 11\/10\/2002<\/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>Carlos Serna Pereda<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: vicente Fern\u00e1ndez herreo <\/li>\n<li>federico Alberto Cebollada baratas (vocal)<\/li>\n<li>Manuel Andr\u00e9s verg\u00e9s (vocal)<\/li>\n<li>Manuel V\u00e1zquez villalabeitia (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de N\u00fa\u00f1ez Alvarez Nuria Ofelia La presente tesis doctoral tiene como objetivo la preparaci\u00f3n de part\u00edculas elipsoidales estables [&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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