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Evaluation of the magnetocaloric effect from magnetization and heat capacity data
Author(s) -
Lee J. S.
Publication year - 2004
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200304685
Subject(s) - magnetic refrigeration , heat capacity , magnetization , adiabatic process , isothermal process , magnetic field , condensed matter physics , materials science , thermodynamics , gadolinium , physics , metallurgy , quantum mechanics
Magnetic refrigeration is based on the magnetocaloric effect (MCE) – the ability of some materials to heat up when magnetized and cool down when removed from the magnetic field. The available techniques for studying the MCE are: (i) direct measurements by monitoring the change in material's temperature during the application or removal of the magnetic field; and (ii) indirect calculations from experimental data of magnetization and/or heat capacity as functions of temperature and magnetic field. In this paper the procedure to evaluate the MCE from magnetization and zero‐field heat capacity data is described. The MCE – isothermal magnetic entropy change (Δ S M ) and adiabatic temperature change (Δ T ad ) – of gadolinium (Gd) obtained by this procedure is presented. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)