2024-03-28T14:07:02Zhttps://www.tdx.cat/oai/requestoai:www.tdx.cat:10803/4034642017-08-31T07:57:16Zcom_10803_1col_10803_399993
nam a 5i 4500
Física de l'estat sòlid
Física del estado sólido
Solid state physics
Transformacions de fase (Física estadística)
Transformaciones de fase (Física estadística)
Phase transformations (Statistical physics)
Calorimetria
Calorimetría
Calorimetry
Giant caloric effects in the vicinity of first-order phase transitions
[Barcelona] :
Universitat de Barcelona,
2017
Accés lliure
http://hdl.handle.net/10803/403464
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Stern i Taulats, Enric,
autor
1 recurs en línia (307 pàgines)
Tesi
Doctorat
Universitat de Barcelona. Departament de Física de la Matèria Condensada
2017
Universitat de Barcelona. Departament de Física de la Matèria Condensada
Tesis i dissertacions electròniques
Mañosa, Lluís,
supervisor acadèmic
Mañosa, Lluís,
supervisor acadèmic
TDX
Solid state materials are candidates to exhibit a large field-driven thermal response in the vicinity of first-order transitions. The strong sensitivity of the transition temperature with the applied field and the latent heat associated with the change of phase can give rise to the giant magneto-, electro-, baro-, and elastocaloric effects. Furthermore, the coupling between structural, magnetic and electronic degrees of freedom at the transition regime enables the thermal response to be driven by multiple fields and, thus, giving rise to the multicaloric effect. In the last years, the interest in understanding and tailoring novel caloric materials has exceptionally grown in view of their potential application to alternative cooling technologies for large scale industry. The present thesis reports the giant caloric effects encompassing the Fe49Rh51 magnetovolumic transition, the magnetostructural martensitic transformation in Ni-Mn based Heusler alloys, and the ferroelectric perovskites BaTiO3 and Pb(Sc0.5Ta0.5)O3. The physical conditions for the optimization of the thermal response which yield to an enlarged magnitude and operation range are explored, as well as the corresponding reproducibility upon field cycling and the potential multicaloric character. This evaluation is achieved by means of a complete caloric characterization in which the calorimetric experimental techniques which have been developed in purpose are crucial.
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