MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
 
Hydrogenation Induced Change in Structures, Magnetic Properties and Specific Heats of Magnetic Regenerative Material ErNi and ErNi2
Tao JinConghang LiJiale HuangKe TangLixin Chen
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2013 Volume 54 Issue 3 Pages 363-366

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Abstract

High specific heats of the magnetic regenerative material, at the temperatures lower than 20 K, is crucial for a regenerative cryocooler to reach a liquid-helium temperature. The hydrogenation of the magnetic regenerative materials ErNi and ErNi2 may change their structures, magnetic properties and specific heats, which will be investigated in this paper. XRD patterns show that crystalline and amorphous phases can both be formed in the hydrogenation at 293 K. The insertion of hydrogen atoms can lead to a larger specific heat, measured by a physical property measurement system (PPMS), in some higher temperature ranges. But the peak values of specific heat of the hydrides are lower than those of their parent compounds below 15 K, which indicates that the idea of regenerative material hydrogenation should be left out in the efforts of regenerator performance enhancement.

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© 2013 The Japan Institute of Metals and Materials
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