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Entropy 2015, 17(3), 1236-1252; doi:10.3390/e17031236

Analysis of the Magnetocaloric Effect in Heusler Alloys: Study of Ni50CoMn36Sn13 by Calorimetric Techniques

1
Instituto de Ciencia de Materiales de Aragón (ICMA) and Dep. de Física de la Materia Condensada, CSIC - University of Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
2
Faculty of Physics, Tver State University, Tver 170000, Russia
3
Faculty of Physics, Chelyabinsk State University, Chelyabinsk 454001, Russia
4
National University of Science and Technology "MISiS", Moscow 119049, Russia
5
ITMO University, 49 Kronverksky Ave., St. Petersburg 197101, Russia
*
Author to whom correspondence should be addressed.
Academic Editor: Kevin H. Knuth
Received: 18 November 2014 / Revised: 28 February 2015 / Accepted: 10 March 2015 / Published: 12 March 2015
(This article belongs to the Section Thermodynamics)
View Full-Text   |   Download PDF [531 KB, uploaded 12 March 2015]   |  

Abstract

Direct determinations of the isothermal entropy increment, \(-\Delta S_T\), in the Heusler alloy Ni\(_{50}\)CoMn\(_{36}\)Sn\(_{13}\) on demagnetization gave positive values, corresponding to a normal magnetocaloric effect. These values contradict the results derived from heat-capacity measurements and also previous results obtained from magnetization measurements, which indicated an inverse magnetocaloric effect, but showing different values depending on the technique employed. The puzzle is solved, and the apparent incompatibilities are quantitatively explained considering the hysteresis, the width of the martensitic transition and the detailed protocol followed to obtain each datum. The results show that these factors should be analyzed in detail when dealing with Heusler alloys. View Full-Text
Keywords: magnetocaloric effect; Heusler alloys; heat capacity; thermal hysteresis magnetocaloric effect; Heusler alloys; heat capacity; thermal hysteresis
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Palacios, E.; Bartolomé, J.; Wang, G.; Burriel, R.; Skokov, K.; Taskaev, S.; Khovaylo, V. Analysis of the Magnetocaloric Effect in Heusler Alloys: Study of Ni50CoMn36Sn13 by Calorimetric Techniques. Entropy 2015, 17, 1236-1252.

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