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Magnetic refrigeration with GdN by Active Magnetic Refrigerator cycle

Published online by Cambridge University Press:  23 March 2011

Yusuke Hirayama ,
Hiroyuki Okada ,
Takashi Nakagawa ,
Takao. A. Yamamoto ,
Takafumi Kusunose ,
Numazawa Takenori ,
Koichi Mastumoto ,
Toshio Irie  and
Eiji Nakamura
Yusuke Hirayama
Affiliation:
Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
Hiroyuki Okada
Affiliation:
Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
Takashi Nakagawa
Affiliation:
Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
Takao. A. Yamamoto
Affiliation:
Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
Takafumi Kusunose
Affiliation:
Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
Numazawa Takenori
Affiliation:
Exploratory Materials Research Laboratories for Energy and Environment, National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan
Koichi Mastumoto
Affiliation:
Department of Physics, Kanazawa University, Kanazawa 920-1192, Japan
Toshio Irie
Affiliation:
SANTOKU corporation, Kobe, Hyogo 674-0093, Japan
Eiji Nakamura
Affiliation:
SANTOKU corporation, Kobe, Hyogo 674-0093, Japan
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Abstract

A magnetic refrigeration test was performed using a test device filled with spherical GdN material synthesized by the hot isostatic pressing (HIP) method. Refrigeration with an active magnetic regenerator cycle was tested in the temperature range between 48 and 66 K, with the field changing from 1.2 to 3.7 T and 2.0 to 4.0 T at upper and lower sides of the regenerator bed filled with the GdN spheres, respectively. Temperature spans about of 2 K were obtained at both sides, and the total temperature span in each cycle attained about 5 K. The specific heat of the material was measured to calculate the magnetic entropy change ΔS and the adiabatic temperature change ΔT induced by the magnetic field change ΔH. It was suggested that for a given ΔH, larger ΔS and ΔT can be exploited when demagnetized to lower H, especially, to zero field.

Keywords

magnetic propertiesnitridehot isostatic pressing (HIP)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1310: Symposium FF – Magnetocalorics and Magnetic Cooling , 2011 , mrsf10-1310-ff01-06
Copyright
Copyright © Materials Research Society 2011

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