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Comparative Study of the Magnetocaloric Properties in Ni-Mn-X (X = Ga, In, Sn) by Magnetization and Specific Heat Measurements

Published online by Cambridge University Press:  31 January 2011

V V Khovaylo ,
K P Skokov ,
E V Avilova ,
Val Novosad ,
H Miki ,
Ryosuke Kainuma ,
G Wang ,
E Palacios ,
J Bartolomé  and
R Burriel
V V Khovaylo
Affiliation:
[email protected], National University of Science and Technology "MISiS", Moscow, Russian Federation
K P Skokov
Affiliation:
[email protected], Tver State University, Faculty of Physics, Tver, Russian Federation
E V Avilova
Affiliation:
[email protected], National University of Science and Technology “MISiS”, Moscow, Russian Federation
Val Novosad
Affiliation:
[email protected], Argonne National Laboratory, Materials Science Division, Argonne, Illinois, United States
H Miki
Affiliation:
[email protected], Tohoku University, Institute of Fluid Science, Sendai, Japan
Ryosuke Kainuma
Affiliation:
[email protected], Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Sendai, Japan
G Wang
Affiliation:
[email protected], Universidad de Zaragoza, Instituto de Ciencia de Materiales de Aragon, Zaragoza, Spain
E Palacios
Affiliation:
[email protected], Universidad de Zaragoza, Instituto de Ciencia de Materiales de Aragon, Zaragoza, Spain
J Bartolomé
Affiliation:
[email protected], Universidad de Zaragoza, Instituto de Ciencia de Materiales de Aragon, Zaragoza, Spain
R Burriel
Affiliation:
[email protected], Universidad de Zaragoza, Instituto de Ciencia de Materiales de Aragon, Zaragoza, Spain
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Abstract

Some compositions of Ni-Mn-X (X = Ga, In, Sn) ferromagnetic shape memory alloys exhibit a first order magnetostructural phase transition. Magnetic entropy change ΔSm in the vicinity of this transition has been studied by magnetization and heat capacity measurements. Comparison of these results point to a large difference in magnitudes of ΔSm obtained from magnetization and heat capacity data. It is suggested that this discrepancy originates from overestimation of \Delta S_m determined from the magnetization measurements and underestimation of ΔSm obtained from the heat capacity measurements.

Keywords

magnetic propertiesmetalphase transformation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1200: Symposium G – Magnetic Shape Memory Alloys , 2009 , 1200-G07-04
Copyright
Copyright © Materials Research Society 2010

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