{"id":131357,"date":"1996-01-01T00:00:00","date_gmt":"1996-01-01T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/transiciones-de-fase-en-perovskitas-ferroelectricas-puras-y-mixtas-pbzr1-xtixo3-rico-en-zr\/"},"modified":"1996-01-01T00:00:00","modified_gmt":"1996-01-01T00:00:00","slug":"transiciones-de-fase-en-perovskitas-ferroelectricas-puras-y-mixtas-pbzr1-xtixo3-rico-en-zr","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/transiciones-de-fase-en-perovskitas-ferroelectricas-puras-y-mixtas-pbzr1-xtixo3-rico-en-zr\/","title":{"rendered":"Transiciones de fase en perovskitas ferroelectricas puras y mixtas: pbzr1-xtixo3 rico en zr."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Beatriz Noheda Pinuaga <\/strong><\/h2>\n<p>En esta tesis se ha comprobado la utilidad de la aproximacion de campo efectivo generalizado para describir las anomalias y discontinuidades caracteristicas en las propiedades fisicas de perovskitas ferroelectricas asi como en ferroelectricos con enlaces de hidrogeno. Se han hecho medidas precisas de constante dielectricas, ciclos de histeresis, expansion termica y respuesta piroelectrica, que han permitido la caracterizacion detallada de las transiciones de fase (frl-frh y frhpc) en pzt rico en circonio. Se han hecho medidad de difraccion de neutrones para estudiar la evolucion de las posiciones atomicas en la transicion frl-frm. Se ha logrado descubrir la dependencia con la composicion de los parametros que determinan el caracter de la transicion y establecer la existencia de dos puntos tricriticos (x=23 y x=75) en el diagrama de fases del pzt.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Transiciones de fase en perovskitas ferroelectricas puras y mixtas: pbzr1-xtixo3 rico en zr.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Transiciones de fase en perovskitas ferroelectricas puras y mixtas: pbzr1-xtixo3 rico en zr. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Beatriz Noheda Pinuaga <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Aut\u00f3noma de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 01\/01\/1996<\/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> Gonzalo Gonzalez Julio A.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Basilio Jim\u00e9nez D\u00edaz <\/li>\n<li> Martinez Duart Jos\u00e9 Manuel (vocal)<\/li>\n<li>Mar\u00eda   Alicia Castro Lozano (vocal)<\/li>\n<li>Jos\u00e9 De Frutos  Vaquerizo (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Beatriz Noheda Pinuaga En esta tesis se ha comprobado la utilidad de la aproximacion de campo efectivo [&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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