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Magnetocaloric Effects of Binary Rare Earth Nitrides

Published online by Cambridge University Press:  01 February 2011

Yusuke Hirayama ,
Takashi Nakagawa ,
Takafumi Kusunose  and
Takao A. Yamamoto
Yusuke Hirayama
Affiliation:
y-hirayama@mit.eng.osaka-u.ac.jp, Osaka university, engineering, Yamadaoka 2-1, Osaka,Suita, N/A, Japan
Takashi Nakagawa
Affiliation:
nakagawat@abe.pe.titech.ac.jp, Tokyo Institute of Technology, Graduate School of Science and Engineering, Meguro, Tokyo, 152-8552, Japan
Takafumi Kusunose
Affiliation:
kusuno15@sanken.osaka-u.ac.jp, Osaka university, Institute of Scientific and Industrial Research, Osaka, Ibaraki, 567-0047, Japan
Takao A. Yamamoto
Affiliation:
takao@mit.eng.osaka-u.ac.jp, Osaka univesity, Graduate School of Engineering, 2-1 Yamada-oka, Osaka, Suita, 565-0871, Japan
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Abstract

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.

Keywords

nitridemagnetic propertiesferromagnetic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1040: Symposium Q – Nitrides and Related Bulk Materials , 2007 , 1040-Q09-05
Copyright
Copyright © Materials Research Society 2008

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