{"id":85961,"date":"2018-03-10T00:10:29","date_gmt":"2018-03-10T00:10:29","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/distribucion-de-sitios-de-cr3-y-transferencia-de-energia-del-cr3-al-tm3-en-vidrios-de-disilicatos-alcalinos\/"},"modified":"2018-03-10T00:10:29","modified_gmt":"2018-03-10T00:10:29","slug":"distribucion-de-sitios-de-cr3-y-transferencia-de-energia-del-cr3-al-tm3-en-vidrios-de-disilicatos-alcalinos","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/distribucion-de-sitios-de-cr3-y-transferencia-de-energia-del-cr3-al-tm3-en-vidrios-de-disilicatos-alcalinos\/","title":{"rendered":"Distribuci\u00f3n de sitios de cr3+ y transferencia de energia del cr3+ al tm3+ en vidrios de disilicatos alcalinos"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Ulises Ruyman Rodr\u00edguez Mendoza <\/strong><\/h2>\n<p>Se han preparado vidrios de disilicatos alcalinos de li, na y k dopados con iones cr3+. Para el caso de medios desordenados se observa un ensanchamiento inhomog\u00e9neo en las bandas de absorci\u00f3n y en los espectros de luminiscencia, que repercuten de forma directa en las propiedades espectrosc\u00f3picas. Se ha considerado que los sitios de cr3+ se encuentran en entornos de campo cristalino octa\u00e9drico, por lo que la asignaci\u00f3n de las transiciones se ha realizado a partir de los diagramas de tanabe-sugano. La interpretaci\u00f3n de los resultados experimentales se ha realizado en funci\u00f3n de un modelo de distribuci\u00f3n de sitios de \u00abcampo bajo\u00bb de iones cr3+. Dicho modelo se basa en considerar la existencia de una distribuci\u00f3n gaussiana para los sitios de iones cr3+ que se caracteriza a partir de un solo par\u00e1metro. los resultados experimentales que se obtienen se ajustan de forma adecuada a las predicciones de dicho modelo. Se ha demostrado a partir de los espectros de emisi\u00f3n que para los tres vidrios en estudio, los sitios corresponden a un campo cristalino bajo, salvo para el caso de disilicato de li, donde a bajas temperaturas se observa la presencia de una banda de emisi\u00f3n correspondiente a los sitios de campo alto. Por otra parte se ha procedido al codopaje de los disilicatos con iones tm3+ en diferentes concentraciones, estudi\u00e1ndose los procesos de transferencia de energ\u00eda radiativa y no radiativa que ocurren. para el c\u00e1lculo de par\u00e1metro de transferencia no radiativa se ha uso, por una parte de la expresi\u00f3n de dexter, y por otra a partir del ajuste de las curvas de decaimiento de la emisi\u00f3n del cr3+ al modelo generalizado de inokuti-hirayama considerando la distribuci\u00f3n de sitios para el cr3+ obteni\u00e9ndose resultados que dan una correcta interpretaci\u00f3n de las medidas experimentales.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Distribuci\u00f3n de sitios de cr3+ y transferencia de energia del cr3+ al tm3+ en vidrios de disilicatos alcalinos<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Distribuci\u00f3n de sitios de cr3+ y transferencia de energia del cr3+ al tm3+ en vidrios de disilicatos alcalinos <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Ulises Ruyman Rodr\u00edguez Mendoza <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 La laguna<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 14\/07\/2000<\/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> Rodriguez Armas Vicente Daniel<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal:  Peraza hernandez Jos\u00e9 f. <\/li>\n<li>Jos\u00e9 Garcia sole (vocal)<\/li>\n<li>Francisco Mauricio dominguez (vocal)<\/li>\n<li> Illarramendi leturia M\u00aa asuncion (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Ulises Ruyman Rodr\u00edguez Mendoza Se han preparado vidrios de disilicatos alcalinos de li, na y k dopados [&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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