{"id":29080,"date":"2004-09-03T00:00:00","date_gmt":"2004-09-03T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/magnetocaloric-effect-in-gd5sixge1-x4-alloys\/"},"modified":"2004-09-03T00:00:00","modified_gmt":"2004-09-03T00:00:00","slug":"magnetocaloric-effect-in-gd5sixge1-x4-alloys","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/barcelona\/magnetocaloric-effect-in-gd5sixge1-x4-alloys\/","title":{"rendered":"Magnetocaloric effect in gd5(sixge1-x)4 alloys"},"content":{"rendered":"<h2>Tesis doctoral de <strong> F\u00e9lix Casanova Fern\u00e1ndez <\/strong><\/h2>\n<p>1,- se han preparado muestras de gd5(sixge1-x)4 con un horno de acero no comercial. Las t\u00e9cnicas de caracterizaci\u00f3n (magnetizaci\u00f3n, susceptibilidad ac, dsc, drx, sem, microsonda) muestran que se obtiene la x nominal con cierta dispersi\u00f3n. Tambi\u00e9n se observan fases residuales 5:3 y 1:1. Un tratamiento t\u00e9rmino a 920\u00c2\u00bac 4-9h en vac\u00edo (10-5 mb) mejora la composici\u00f3n.  2,- se ha desarrollado un calor\u00edmetro dsc que opera bajo campo magn\u00e9tico (h), para estudiar transiciones de fase de 1r orden inducidas por campo. el dsc mide el cambio entr\u00f3pico (ds) asociado a la transici\u00f3n magnetostructural que presentan efecto magnetocal\u00f3rico (mce) gigante, transici\u00f3n qu epude ser inducida por t y h.  3,- se ha demostrado que los valores de dsc y la ecuaci\u00f3n de clausius-clapeyron evaluna ds  de la transici\u00f3n de 1r orden. La relaci\u00f3n de maxell tambi\u00e9n lo eval\u00faa si se integra el rango de h de la transici\u00f3n. Si se integra todo el rango de h, la variaci\u00f3n de la magnetizaci\u00f3n con t y h da cambio entr\u00f3pico adicional que se debe contar para el mce. La t de transici\u00f3n (tt) se debe mover con h para aprovechar ds como mce.  4,- se observa un escalado de ds con tt, ya que tt var\u00eda con x y h, demostrando la equiValencia de los efectos de magnetovolumen y los de sustituci\u00f3n con gd5(sixge1-x)4.  5,- se ha estudiado la variaci\u00f3n del campo de transici\u00f3n con tt (dht\/dtt) para x menor 0.5, donde aparece la transici\u00f3n magnetostructural. Su comportamiento, que depende m\u00e1s de la naturaleza del cambio magn\u00e9tico de la transici\u00f3n que del estructural, explica el escalado.  6,- para aleaciones ricas en ge, se han construido los diagramas de fases magn\u00e9ticos. Aparecen correlaciones fm en la fase afm y en la fase pm hay correlaciones afm y fm de corto alcance. El complejo diagrama proviene de las fuertes competiciones entre interacciones fm (dentro de las capas que forman la estructura) y afm (entre capas).  7,- se ha estudiado la din\u00e1mica de la t<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Magnetocaloric effect in gd5(sixge1-x)4 alloys<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Magnetocaloric effect in gd5(sixge1-x)4 alloys <\/li>\n<li><strong>Autor:<\/strong>\u00a0 F\u00e9lix Casanova Fern\u00e1ndez <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Barcelona<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 09\/03\/2004<\/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>Xavier Batlle Gelabert<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: javier Tejada palacios <\/li>\n<li>Manuel ricardo Ibarra garcia (vocal)<\/li>\n<li>Jos\u00e9 Carlos Gomez sal (vocal)<\/li>\n<li>antoni Planes vila (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de F\u00e9lix Casanova Fern\u00e1ndez 1,- se han preparado muestras de gd5(sixge1-x)4 con un horno de acero no comercial. [&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 center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"categories":[5453,951,1007,1790],"tags":[1012,82444,19129,10432,26297,20353],"class_list":["post-29080","post","type-post","status-publish","format-standard","hentry","category-aleaciones","category-barcelona","category-propiedades-magneticas-de-los-solidos","category-propiedades-termicas-de-los-solidos","tag-antoni-planes-vila","tag-felix-casanova-fernandez","tag-javier-tejada-palacios","tag-jose-carlos-gomez-sal","tag-manuel-ricardo-ibarra-garcia","tag-xavier-batlle-gelabert"],"_links":{"self":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts\/29080","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/comments?post=29080"}],"version-history":[{"count":0,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts\/29080\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/media?parent=29080"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/categories?post=29080"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/tags?post=29080"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}