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4K-GM Cryocooler Performance and Thermal Conductivity of HoxEr1-xN

Published online by Cambridge University Press:  29 April 2013

Takanori Nakano ,
Yusuke Hirayama ,
Takushi Izawa ,
Takashi Nakagawa ,
Yasushi Fujimoto ,
Shinji Masuyama ,
Toshio Irie ,
Eiji Nakamura  and
Takao A. Yamamoto
Takanori Nakano
Affiliation:
Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
Yusuke Hirayama
Affiliation:
Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
Takushi Izawa
Affiliation:
Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
Takashi Nakagawa
Affiliation:
Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
Yasushi Fujimoto
Affiliation:
Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan
Shinji Masuyama
Affiliation:
Oshima National College of Maritime Technology, 1091-1 Komatsu, Suo-oshima-cho, Oshima-gun, Yamaguchi 742-2193, Japan.
Toshio Irie
Affiliation:
Santoku Corporation, 4-14-34 Fukaekita-cho, Higashinada-ku, Kobe, Hyogo 658-0013, Japan.
Eiji Nakamura
Affiliation:
Santoku Corporation, 4-14-34 Fukaekita-cho, Higashinada-ku, Kobe, Hyogo 658-0013, Japan.
Takao A. Yamamoto
Affiliation:
Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
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Abstract

HoxEr1-xN (x=0.25, 0.5, 0.75) samples were synthesized by nitriding of HoxEr1-x alloy bars and their thermal conductivity κ were measured. The measured κ values were comparable to those of stainless steel and Er3Ni. Ho0.5Er0.5N showed the highest κ of the present three samples. The thermal diffusivity calculated from the κ and the specific heat indicates that Ho0.5Er0.5N is a very promising regenerator material for the cryocoolers. The electrical resistivity ρ was also measured as a function of temperature.

Keywords

nitridethermal conductivityspecific heat

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