Rare earth oxysulfide cold storage medium
AssigneeKonoshima Chemical Co., Ltd.
InventorsTakagimi Yanagitani, Hoshiteru Nozawa
Life of this patent
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Abstract
A cold storage material having a large thermal capacity in a ultra-low temperature range of 10 K or less and being highly durable against thermal shock and mechanical vibration. The cold storage material contains a rare earth oxysulfide ceramic represented by the general formula R2O2S in which R is one or more kinds of rare earth elements selected from La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y, and Al2O3 having a specific surface area of 0.3 m2/g to 11 m2/g is added to the cold storage material.
Claims4
A method for estimating a composition ratio of a rare earth oxysulfide-based cold storage material, wherein Al2O3 reacts with Gd2O2S to obtain Gd2O2S, Al2O3 and GdAlO3 as the composition, and taking the X-ray intensity of Gd2O2S at a diffraction angle (2θ) of 29.909° as 100, the proportion (%) of the X-ray intensity of GdAlO3 at a diffraction angle (2θ) of 33.989° relative to the X-ray intensity of Gd2O2S is a first relative X-ray intensity and the proportion (%) of the X-ray intensity of Al2O3 at a diffraction angle (2θ) of 35.152° relative to the X-ray intensity of Gd2O2S is a second relative X-ray intensity, and the first relative X-ray intensity is within a prescribed range and the second relative X-ray intensity is within another prescribed range.
Dependencies are inferred from the claim text.