In this paper we investigate the entropy change and the kinetics at the magneto-structural transition (at 628 K) of polycrystalline MnBi. Samples were prepared by rapid quenching and annealing and exhibit 86 wt% of the hexagonal MnBi phase. The entropy change at the transition is found to be Delta s = 17.6 J kg(-1) K-1 and the magnetic field shifts the transition temperature at a rate of 2.6 K T-1. The temperature hysteresis, of 19 K, is quite large for magneto-thermal application. The transition shows kinetics effects upon cooling in which the transition temperature is found to depend approximately to the logarithm of the temperature rate with coefficient -3.8 K. (C) 2013 Elsevier Ltd and IIR. All rights reserved.

Entropy change and kinetic effects at the magnetostructural phase transition of MnBi / Basso, V; Olivetti, E. S.; Martino, L; Kuepferling, M. - In: INTERNATIONAL JOURNAL OF REFRIGERATION. - ISSN 0140-7007. - 37:(2014), pp. 266-272. [10.1016/j.ijrefrig.2013.07.013]

Entropy change and kinetic effects at the magnetostructural phase transition of MnBi

Basso V;Olivetti E. S.;Martino L;Kuepferling M
2014

Abstract

In this paper we investigate the entropy change and the kinetics at the magneto-structural transition (at 628 K) of polycrystalline MnBi. Samples were prepared by rapid quenching and annealing and exhibit 86 wt% of the hexagonal MnBi phase. The entropy change at the transition is found to be Delta s = 17.6 J kg(-1) K-1 and the magnetic field shifts the transition temperature at a rate of 2.6 K T-1. The temperature hysteresis, of 19 K, is quite large for magneto-thermal application. The transition shows kinetics effects upon cooling in which the transition temperature is found to depend approximately to the logarithm of the temperature rate with coefficient -3.8 K. (C) 2013 Elsevier Ltd and IIR. All rights reserved.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11696/30235
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