{"id":90257,"date":"2018-03-10T00:15:37","date_gmt":"2018-03-10T00:15:37","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/eutecticos-cazro3-zro2cao-y-al2o3-zro2-y2o3-procesados-direccionalmente-por-laser-microestructura-y-espectroscopia-optica-de-cr3-y-er3\/"},"modified":"2018-03-10T00:15:37","modified_gmt":"2018-03-10T00:15:37","slug":"eutecticos-cazro3-zro2cao-y-al2o3-zro2-y2o3-procesados-direccionalmente-por-laser-microestructura-y-espectroscopia-optica-de-cr3-y-er3","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/eutecticos-cazro3-zro2cao-y-al2o3-zro2-y2o3-procesados-direccionalmente-por-laser-microestructura-y-espectroscopia-optica-de-cr3-y-er3\/","title":{"rendered":"Eut\u00e9cticos cazro3-zro2(cao) y al2o3-zro2 (y2o3) procesados direccionalmente por l\u00e1ser microestructura y espectroscopia \u00f3ptica de cr3+ y er3+"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Jos\u00e9 \u00e1ngel Pardo Gracia <\/strong><\/h2>\n<p>La solidificaci\u00f3n direccional de fundidos con la composici\u00f3n eut\u00e9ctica es un m\u00e9todo sencillo de obtenci\u00f3n de materiales microestructurados y marcadamente anis\u00f3tropos. Cuando las fases eut\u00e9cticas son aislantes y transparentes, los materiales as\u00ed producidos tienen potenciales aplicaciones \u00f3pticas como apilamientos de gu\u00edas \u00f3pticas, cristales fot\u00f3nicos, etc.  los sistemas binarios eut\u00e9cticos investigados en esta tesis doctoral han sido zro2-cao y al2o3-zro2. La microestructura del primero consiste en una distribuci\u00f3n de l\u00e1minas de la perovskita cazro3, ortorr\u00f3mbica a temperatura ambiente, y de la disoluci\u00f3n c\u00fabica zro2 (cao). En el segundo caso el crecimiento origina colonias monocristalinas de al2o3 en cuyo interior aparece una distribuci\u00f3n de fibras alineadas de zro2. En este \u00faltimo sistema, adem\u00e1s, se ha estabilizado el \u00f3xido de circonio en sus formas c\u00fabica o tetragonal mediante la sustituci\u00f3n parcial por y2o3. Todos los eut\u00e9cticos han sido solidificados direccionalmente a partir de la fusi\u00f3n zonal inducida por l\u00e1ser de radiaci\u00f3n infrarroja.  el objeto de esta investigaci\u00f3n ha sido introducir impurezas \u00f3pticamente activas en los anteriores eut\u00e9cticos con dos finalidades: estudiar sus propiedades espectrosc\u00f3picas b\u00e1sicas, haciendo \u00e9nfasis en la influencia de la microestructura, y utilizar la luminiscencia como sonda estructural y de tensiones para estudiar el material. Adem\u00e1s de la espectroscopia \u00f3ptica de absorci\u00f3n y emisi\u00f3n se han utilizado en menor medida otras t\u00e9cnicas espectrosc\u00f3picas, como raman y epr.  los resultados muestran c\u00f3mo los distintos coeficientes de partici\u00f3n de cada impureza en el fundido dan lugar a una distribuci\u00f3n diferencial entre las fases eut\u00e9cticas. En los eut\u00e9cticos laminares cazro3-zro2(cao), que presentan guiado \u00f3ptico, la espectroscopia \u00f3ptica del er3+ y el cr3+ puede estudiarse a partir de la correspondiente a monocristales de las fases aisladas (r.I. Merino e<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Eut\u00e9cticos cazro3-zro2(cao) y al2o3-zro2 (y2o3) procesados direccionalmente por l\u00e1ser microestructura y espectroscopia \u00f3ptica de cr3+ y er3+<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Eut\u00e9cticos cazro3-zro2(cao) y al2o3-zro2 (y2o3) procesados direccionalmente por l\u00e1ser microestructura y espectroscopia \u00f3ptica de cr3+ y er3+ <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Jos\u00e9 \u00e1ngel Pardo Gracia <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Zaragoza<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 22\/05\/2001<\/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> Merino Rubio Rosa Isabel<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: rafael Alcala aranda <\/li>\n<li>Javier Llorca Martinez (vocal)<\/li>\n<li>Jos\u00e9 Garc\u00eda sol\u00e9 (vocal)<\/li>\n<li>pilar Pena castro (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Jos\u00e9 \u00e1ngel Pardo Gracia La solidificaci\u00f3n direccional de fundidos con la composici\u00f3n eut\u00e9ctica es un m\u00e9todo sencillo [&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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