Evaluation of low-temperature specific heats and thermal conductivities of Er-Ag alloys as regenerator materials

Tetsushi Biwa, Wataru Yagi, Uichiro Mizutani

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The low-temperature specific heat for a series of ErxAg100-x (x = 40, 50, 60 and 70) alloys has been measured over the temperature range 1.6-30 K to evaluate their applicability as regenerator materials. In the temperature range 10-20 K, the volumetric specific heat for the x = 50-70 samples exceeds that for Er3Ni, which is currently known as the most efficient regenerator material. The x = 40 sample is superior to Er3Ni below 6 K. In addition, we found that the thermal conductivity for the present Er-Ag alloys is 5-10 times that for Er3Ni below 25 K. We conclude that the present Er-Ag alloys are suitable as regenerator materials, particularly if a composition-gradient composite regenerator material, in which the Er concentration varies from 70 to 40 along the direction of the gas flow, is fabricated.

Original languageEnglish
Pages (from-to)2244-2248
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume35
Issue number4 A
Publication statusPublished - 1996 Apr 1
Externally publishedYes

Keywords

  • Er-Ag alloys
  • Gifford-McMahon refrigerator
  • Low-temperature specific heat
  • Regenerator material
  • Stirling refrigerator
  • Thermal conductivity

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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