期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 316, 期 2, 页码 E555-E557出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2007.03.017
关键词
magnetocaloric effect; magnetic phase transition; magnetization
The magnetic field and temperature dependences of the adiabatic temperature change (Delta T) were measured in single-crystalline and polycrystalline gadolinium (Gd) near the Curie point (T(C)) by a direct method while continuously changing magnetic field (H) at different rates and the more conventional stepping of the magnetic field from 0 to 1.2 T. The Delta T(H) behavior has a tendency towards saturation at high magnetic fields, which is similar for both the polycrystal and the single crystal (in the latter case, the magnetic field vectors was parallel to the c-axis of the crystal). The Curie temperature of Gd was determined from Belov-Goryaga (Arrott) plots using isothermal magnetization data and a similar technique using adiabatic temperature change isotherms. In the latter case, T(C) was about 9 K higher than in the first case. Possible reasons for the observed difference are discussed. (C) 2007 Published by Elsevier B.V.
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