{"id":79152,"date":"2018-03-09T23:24:58","date_gmt":"2018-03-09T23:24:58","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/nuevos-fenomenos-fotoluminiscentes-inducidos-a-alta-presion-en-materiales-de-mn2-y-cr3\/"},"modified":"2018-03-09T23:24:58","modified_gmt":"2018-03-09T23:24:58","slug":"nuevos-fenomenos-fotoluminiscentes-inducidos-a-alta-presion-en-materiales-de-mn2-y-cr3","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/nuevos-fenomenos-fotoluminiscentes-inducidos-a-alta-presion-en-materiales-de-mn2-y-cr3\/","title":{"rendered":"Nuevos fen\u00f3menos fotoluminiscentes inducidos a alta presi\u00f3n en materiales de mn2+ y cr3+."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Ignacio Hernandez Campo <\/strong><\/h2>\n<p>La tesis se centra en el estudio experimental de las propiedades lumniscentes de fluoruros con mn2+ y cr3+ como unidades \u00f3pticamente activas, bien como constituyentes (materiales puros) o como impurezas. La idea es establecer correlaciones estructurales entre las propiedades \u00f3pticas y estructura con el fin de conocer los mecanismos microsc\u00f3picos responsables de los fen\u00f3menos luminiscentes y de los rocesos no radiativos. Para ello se han seleccionado las fluoritas de la serie ca1-xsrxf2: mn2+ y baf2: mn2+, el mnf2 y las fluor-elpasolitas a2bmf6: cr3+ (a=k,rb, ti; b=na, k; m=ga, in, cr). Los estudios se han realizado mediante t\u00e9cnicas espectrosc\u00f3picas en funci\u00f3n de la y la temperatura empleando t\u00e9cnicas de altas presiones.  los resultados m\u00e1s relevantes son los siguientes: &#8211; la p\u00e9rdida de luminiscencia al pasar de caf2: mn2+a srf2: mn2+ y baf2:mn2+ se ha explicado mediante una \u00fanica expresi\u00f3n que contiene un t\u00e9rmino no radiativo, que depende de la fase estructural del material, y n t\u00e9rmino no radiativo que s\u00f3lo depende del volumen del sitio sustitucional del mn2+ y la temperatura. A partir de estos resultados se ha inducido fotoluminiscencia en los materiales no luminiscentes por medio de la alta presi\u00f3n.  &#8211; el mnf2 presenta una alta eficiencia luminiscente a baja temperatura pero deja de ser lumniscente al para temperaturas mayores de 140 k. Se ha intentado controlar esta p\u00e9rdida de fotoluminiscencia mediante dos estrategias: eliminaci\u00f3n de impurezas no radiativas mediante la reducci\u00f3n del tama\u00f1o de las part\u00edculas a escala nanom\u00e9trica e interrupci\u00f3n de v\u00edas de superintercambio mediante cambios estructurales inducidos a alta presi\u00f3n. El molido mec\u00e1nico favorece la formaci\u00f3n de la fase fotoluminiscente tipo alfa pbo2 de mnf2, aumentando la temperatura de desactivaci\u00f3n de la luminiscencia m\u00e1s de 80 k. Un resultado importante es que se ha conseguido fotolumniscencia en mnf2 a temperatura ambiente alta presi\u00f3n.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Nuevos fen\u00f3menos fotoluminiscentes inducidos a alta presi\u00f3n en materiales de mn2+ y cr3+.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Nuevos fen\u00f3menos fotoluminiscentes inducidos a alta presi\u00f3n en materiales de mn2+ y cr3+. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Ignacio Hernandez Campo <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Cantabria<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 21\/03\/2006<\/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>Gonzalez Fernando Rodriguez<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: alfredo Segura garc\u00ed\u00b6a del rio <\/li>\n<li> San Miguel (vocal)<\/li>\n<li>hans Hochheimer (vocal)<\/li>\n<li> Dunstan (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Ignacio Hernandez Campo La tesis se centra en el estudio experimental de las propiedades lumniscentes de fluoruros [&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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