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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
Affiliation:
v-khovaylo@cplire.ru, National University of Science and Technology "MISiS", Moscow, Russian Federation
K P Skokov
Affiliation:
k.skokov@ifw-dresden.de, Tver State University, Faculty of Physics, Tver, Russian Federation
E V Avilova
Affiliation:
avmar2001@mail.ru, National University of Science and Technology “MISiS”, Moscow, Russian Federation
Val Novosad
Affiliation:
novosad@anl.gov, Argonne National Laboratory, Materials Science Division, Argonne, Illinois, United States
H Miki
Affiliation:
miki@wert.ifs.tohoku.ac.jp, Tohoku University, Institute of Fluid Science, Sendai, Japan
Ryosuke Kainuma
Affiliation:
kainuma@tagen.tohoku.ac.jp, Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Sendai, Japan
G Wang
Affiliation:
skokov_k_p@mail.ru, Universidad de Zaragoza, Instituto de Ciencia de Materiales de Aragon, Zaragoza, Spain
E Palacios
Affiliation:
skokov@mail.ru, Universidad de Zaragoza, Instituto de Ciencia de Materiales de Aragon, Zaragoza, Spain
J Bartolomé
Affiliation:
kpskokov@mail.ru, Universidad de Zaragoza, Instituto de Ciencia de Materiales de Aragon, Zaragoza, Spain
R Burriel
Affiliation:
skokov_k@mail.ru, 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.

Type
Research Article
Copyright
Copyright © Materials Research Society 2010

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