Rare earth metal oxysulfide regenerative material and regenerator
AssigneeKonoshima Chemical Co., Ltd.
InventorsYanagitani Takagimi, Nozawa Hoshiteru, Kagawa Katsunori
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Abstract
A rare earth metal oxysulfide represented by a general formula R2O2S (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.
Claims15
A rare earth metal oxysulfide regenerative material comprising a rare earth metal oxysulfide represented by a general formula R2O2S in which R represents at least one member of rare earth elements selected from the group consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y, characterized in that an additive comprising an oxide, a carbide or a nitride of at least one member selected from the group consisting of alkaline-earth metals, transition metals, and elements of 3b and 4b groups of the periodic table excluding C is added to said rare earth metal oxysulfide by 0.05–30 wt %.
A regenerator packed with a rare earth metal oxysulfide regenerative material comprising a rare earth metal oxysulfide represented by a general formula R2O2S (R denotes at least one member of rare earth elements selected from the group consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, DY, Ho, Er, Tm, Yb and Lu, as well as Y).
Dependencies are inferred from the claim text.