Rare earth metal oxysulfide regenerative material and regenerator
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United States of America Patent
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Jun 5, 2007
Grant Date -
Jan 22, 2004
app pub date -
Jun 13, 2002
filing date -
Jun 18, 2001
priority date (Note) -
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Abstract
A rare earth metal oxysulfide represented by a general formula R.sub.2O.sub.2S (R denotes one kind or two or more kinds of rare earth elements to be selected from a group of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, as wells as Y) is formed into spherical granules. The mean particle size of the granules is 0.05 1 mm and their relative density is 96% or over. The granules are used as a regenerative material at the liquid helium temperature.
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