Titre :

Large magnetocaloric effect due to spin-glass behavior in the (Mn_1/3R_2/3)₂(Mn_1/3Sb_2/3)₂O₇ pyrochlore series

Auteur(s) :

Solana-Madruga, E. [Auteur]
Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] [UCM]
Dos Santos-Garcã­a, A. J. [Auteur]
Universidad Politécnica de Madrid [UPM]
Ritter, C. [Auteur]
Institut Laue-Langevin [ILL]
Arevalo Lopez, Angel [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Avila-Brande, D. [Auteur]
Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] [UCM]
Urones-Garrote, E. [Auteur]
Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] [UCM]
Sã¡ez-Puche, R. [Auteur]
Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] [UCM]

Titre de la revue :

Solid State Sci.

Nom court de la revue :

Solid State Sci.

Numéro :

150

Pagination :

107499

Date de publication :

2024-05-06

ISSN :

1293-2558

Mot(s)-clé(s) en anglais :

Magnetocaloric effect
Magnetic refrigeration
Cryo-cooling
Hydrogen energy
Spin-glass
Pyrochlore

Discipline(s) HAL :

Chimie/Chimie inorganique

Résumé en anglais : [en]

The synthesis, structural characterization and magnetic properties of the (Mn1/3R2/3)2(Mn1/3Sb2/3)2O7 pyrochlore series are detailed herein. The R3+ (Rare earth) and Sb5+ cations occupy the A and B sites respectively, due ...
Lire la suite >The synthesis, structural characterization and magnetic properties of the (Mn1/3R2/3)2(Mn1/3Sb2/3)2O7 pyrochlore series are detailed herein. The R3+ (Rare earth) and Sb5+ cations occupy the A and B sites respectively, due to their charge/size ratio. Mn is found to be located in a 1/3 ratio in both positions with selective oxidation state due to size restrictions. Mixed valence in Mn2+/Mn3+ was confirmed from EELS spectroscopy. According to their geometric frustration and R3+-Mn2+/Sb5+-Mn3+ disorder, spin glass behavior is observed from dc and ac magnetic susceptibility data and no long-range magnetic order could be observed from NPD data down to 1.5 K. The magnetic entropy variation calculated from field dependent magnetization curves reveals large magnetocaloric effect (MCE) for these compounds, suggesting its relation to the dynamics of the frozen state. These values reach up to ΔSM ∼20.7 J/kgK for the Rdouble bondGd sample, which is comparable to other materials with large MCE induced by FM order. This renders these materials competitive in magnetic refrigeration and opens the path for new enhanced magnetocaloric materials exploiting this mechanism.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
CNRS
Centrale Lille
ENSCL
Univ. Artois

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Équipe(s) de recherche :

Matériaux inorganiques, structures, systèmes et propriétés (MISSP)

Date de dépôt :

2024-05-18T21:08:12Z
2024-05-31T08:12:35Z