Matériaux de type LaFe13-xSix à fort pouvoir magnétocalorique - Synthèse et optimisation de composés massifs et hypertrempés - Caractérisations fondamentales

Abstract : Magnetic refrigeration at room temperature, an alternative to conventional refrigeration, requires efficient magnetocaloric materials. The magnetocaloric effect is reflected by an entropy variation or a temperature variation of the material undergoes a magnetic field. The LaFe13-xSix type compounds present interesting advantages. First step consisted in investigating this system. Through chemical substitutions and interstitial elements insertion, we studied several compositions, including those of LaFe13-x-yCoySix type and hydrides LaFe13-xSixHy which proved to be the most promising ones. The structural, microstructural, thermal and magnetic characterization have led us in the optimization of the elaboration method, arc melting or induction melting, heat treatment, stoichiometry control, and so on. In a second step we set up the synthesis of these materials at a larger commercial scale with our industrial partners.
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Submitted on : Thursday, January 26, 2012 - 12:11:33 PM
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Mariana Rosca. Matériaux de type LaFe13-xSix à fort pouvoir magnétocalorique - Synthèse et optimisation de composés massifs et hypertrempés - Caractérisations fondamentales. Matériaux. Université de Grenoble, 2010. Français. ⟨tel-00663184⟩

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