Low temperature properties of some Er-rich intermetallic compounds Page: 1 of 7
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IS-M 928
LOW TEMPERATURE PROPERTIES OF SOME Er-RICH INTERMETALLIC
COMPOUNDS
K.A. Gschneidner, Jr.,"2 A.O. Pecharsky,' Lucas Hale,' and
V.K. Pecharsky'2
'Ames Laboratory
2Department of Materials Science and Engineering, Iowa State University,
Ames, Iowa 50011-3020, USA
ABSTRACT
The low temperature volumetric heat capacity (-3.5 to 350 K) and magnetic
susceptibility (-4 to 320 K) of Er3Rh, Er3Ir, Er3Pt, Er2Al, and Er2Sn have been measured.
All of the compounds order antiferromagnetically (or ferrimagnetically), and most exhibit
more than one magnetic ordering transition. The volumetric heat capacities in general are
smaller than those of the prototype magnetic regenerator materials, except for Er3Ir in the
12 to 14 K temperature range.
INTRODUCTION
Lanthanide materials have been used as low temperature (<20 K) regenerators since
1990. Capitalizing on the large magnetic entropies of the lanthanides Toshiba scientists
[1,2] lowered the low temperature limit of a two stage Gifford-McMahon (G-M)
cryocooler from -10 K to -4 K by replacing Pb in the low temperature stage with Er3Ni.
Subsequently, Nd [3] and HoCu2 [4] have been utilized for cooling down to -4 K, while Er
and Er-Pr alloys (up to 50 at.% Pr) have been suggested as a replacement for Pb [5,6] as the
intermediate temperature (-10 to --60 K) range regenerator material. More recently
Tanaeva et al. [7] proposed GdAlO3, which orders at 3.8 K, as the magnetic material for
the coldest section of the regenerator. Today research is still being conducted to find
improved regenerator materials, which order magnetically below 20 K, in order to enhance
the performance of Stirling, G-M, and pulse tube cryocoolers. Below, we summarize our
recent research on five Er-rich materials: Er3Rh, Er3lr, Er3Pt, Er2Al, and Er2Sn.
EXPERIMENTAL DETAILS
The alloys were prepared by arc-melting stoichiometric amounts of the component
materials on a water cooled copper hearth under an argon atmosphere. The alloys wereLownIuded 04 Aug 2004 to 1 55J9020S.209. Rcdiributiun subject to A P license tr c opyriohi sce htp::4procling:ip.org/pioc dingcpr.j.p
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K.A. Gshneidner,jr; Pecharsky, A.O.; L.Hale & Pecharsky, V.K. Low temperature properties of some Er-rich intermetallic compounds, article, September 30, 2004; Ames, Iowa. (https://digital.library.unt.edu/ark:/67531/metadc789008/m1/1/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.