In this paper we investigate the magnetocaloric properties of polycrystalline MnBi at its magnetostructural transition at 628 K. The samples, prepared by rapid quenching and annealing, present 86 wt% of the hexagonal MnBi phase. The entropy change at the transition is found to be Δs =17.6 Jkg-1K-1 and the magnetic field shifts the transition temperature of 2.6 KT-1. Despite the relevant magnetocaloric properties, the temperature hysteresis, of 19 K, is quite large for magnetothermal application.
Entropy change at the magnetostructural phase transition of polycrystalline MnBi / Basso, V.; Olivetti, E.; Martino, L.; Sasso, C.P.; Kuepferling, M.. - 2012-5(2012), p. 153. ((Intervento presentato al convegno Fifth IIF-IIR International Conference on Magnetic Refrigeration at Room Temperature tenutosi a Grenoble nel 17-20 September 2012.
Entropy change at the magnetostructural phase transition of polycrystalline MnBi
BASSO, VITTORIO;OLIVETTI, ELENA SONIA;MARTINO, LUCA UGO;SASSO, CARLO PAOLO;KUEPFERLING, MICHAELA
2012
Abstract
In this paper we investigate the magnetocaloric properties of polycrystalline MnBi at its magnetostructural transition at 628 K. The samples, prepared by rapid quenching and annealing, present 86 wt% of the hexagonal MnBi phase. The entropy change at the transition is found to be Δs =17.6 Jkg-1K-1 and the magnetic field shifts the transition temperature of 2.6 KT-1. Despite the relevant magnetocaloric properties, the temperature hysteresis, of 19 K, is quite large for magnetothermal application.| File | Dimensione | Formato | |
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