{"id":72554,"date":"2005-02-02T00:00:00","date_gmt":"2005-02-02T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/calor-especa%c2%adfico-y-efecto-magnetocalorico-en-intermetalicos-de-gd-hidruros-de-ce-y-fosfatos-de-metales-de-transicion\/"},"modified":"2005-02-02T00:00:00","modified_gmt":"2005-02-02T00:00:00","slug":"calor-especa%c2%adfico-y-efecto-magnetocalorico-en-intermetalicos-de-gd-hidruros-de-ce-y-fosfatos-de-metales-de-transicion","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/calor-especa%c2%adfico-y-efecto-magnetocalorico-en-intermetalicos-de-gd-hidruros-de-ce-y-fosfatos-de-metales-de-transicion\/","title":{"rendered":"Calor espec\u00edfico y efecto magnetocal\u00f3rico en intermet\u00e1licos de gd, hidruros de ce y fosfatos de metales de transici\u00f3n."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Jorge Sanchez Marcos <\/strong><\/h2>\n<p>Este trabajo presenta las propiedades calorimetricas, calor espec\u00edfico y efecto magnetocalorico de tres familias de compuestos, intermetalicos de gadolinio preparados mecanicamente y en fase amorfa, compuestos de cerio hidrogenados y fosfatos de metales de transicon, de los cuales se han estudiado a su vez dos familias, metafosfatos y hidroxifosfatos.  el estudio de los compuestos de gadolinio amorfizados por aleado mec\u00e1nico pone de relieve que a pesar de que los m\u00e1ximos de las dos magnitudes que caracterizan el efecto magnetocal\u00f3rico dismuyen, el ensanchamiento es tan grande que provoca que el poder de enfriado relativo sea m\u00e1s importante en la fase amorfa que en la cristalina.  en los compuestos de cerio hidrogenados se estudia el efecto de incrementar las distancias interat\u00f3micas mediante la inclusi\u00f3n de hidr\u00f3geno. Ese efecto introduce modificaciones en los comportamientos al dismunir los efectos de hibridaci\u00f3n 4f-banda de conducci\u00f3n. Alguno de ellos puede que presente a bajas temperaturas efectos de clusterizaci\u00f3n magn\u00e9tica. El efecto magnetocal\u00f3rico en estos compuestos no es despreciable a pesar del peque\u00f1o momento magn\u00e9tico que presentan.  en los fostatos de metales de transici\u00f3n se ha estudiado en detalle las diferentes transiciones magn\u00e9ticas y su evoluci\u00f3n con el campo magn\u00e9tico. se presentan detallados an\u00e1lisis de las diferentes contribuciones, proponiendo un modelo con dos leyes de debye para la estimaci\u00f3n de la contribuci\u00f3n fon\u00f3nica que explica las medidas realizadas. Es de destacar el efecto magnetocal\u00f3rico encontrado en uno de los metafosfatos, cr (po3)3, que a pesar de su car\u00e1cter antiferromagn\u00e9tico, posee un efecto muy importante en 4.2 k.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Calor espec\u00edfico y efecto magnetocal\u00f3rico en intermet\u00e1licos de gd, hidruros de ce y fosfatos de metales de transici\u00f3n.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Calor espec\u00edfico y efecto magnetocal\u00f3rico en intermet\u00e1licos de gd, hidruros de ce y fosfatos de metales de transici\u00f3n. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Jorge Sanchez Marcos <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Cantabria<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 02\/02\/2005<\/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>Jes\u00fas Rodriguez Fernandez<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Jos\u00e9 Carlos Gomez sal <\/li>\n<li>teofilo Rojo aparicio (vocal)<\/li>\n<li>chevalier Bernard (vocal)<\/li>\n<li>Luis Alberto Morell\u00f3n alqu\u00e9zar (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Jorge Sanchez Marcos Este trabajo presenta las propiedades calorimetricas, calor espec\u00edfico y efecto magnetocalorico de tres familias [&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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