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Magnetocaloric Effects of Binary Rare Earth Nitrides

Published online by Cambridge University Press:  01 February 2011

Yusuke Hirayama
Affiliation:, Osaka university, engineering, Yamadaoka 2-1, Osaka,Suita, N/A, Japan
Takashi Nakagawa
Affiliation:, Tokyo Institute of Technology, Graduate School of Science and Engineering, Meguro, Tokyo, 152-8552, Japan
Takafumi Kusunose
Affiliation:, Osaka university, Institute of Scientific and Industrial Research, Osaka, Ibaraki, 567-0047, Japan
Takao A. Yamamoto
Affiliation:, Osaka univesity, Graduate School of Engineering, 2-1 Yamada-oka, Osaka, Suita, 565-0871, Japan
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We synthesized HoxEr1−xN (x =0.1, 0.3, 0.5, 0.7, 0.9) by the carbothermic reduction method. The magnetic entropy change, ΔS, which is an indicator of performance of magnetocaloric effect, MCE, was obtained from data sets of magnetization M (H, T) measured at various temperature, T, and magnetic field, H, through the Maxwell equations. The Thus obtained ΔS vs. T curves have peaks at temperatures depending on x in a range of 8–18 K. ΔS values of HoxEr1−xN expressed in terms of J K−1 m−3 were higher than those of intermetallic compounds of rare earth and transition metals previously reported. These ΔS peak plots are along a convex curve, which may indicate an interaction between the two components.

Research Article
Copyright © Materials Research Society 2008

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