Rare earth oxysulfide cold storage medium
AssigneeKonoshima Chemical Co., Ltd.
InventorsTakagimi Yanagitani, Hoshiteru Nozawa
Life of this patent
Estimating the term…
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.
Claims3
A method for estimating a ratio of GdAlO3 to Gd2O2S and a ratio of Al2O3 to Gd2O2S by an X-ray intensity, wherein Al2O3 reacts with Gd2O2S to obtain Gd2O2S, Al2O3 and GdAlO3 as a composition, the method comprising:
- a first step of obtaining an X-ray intensity of Gd2O2S at a diffraction angle (2θ) of 29.909°;
- a second step of obtaining an X-ray intensity of GdAlO3 at a diffraction angle (2θ) of 33.989°;
- a third step of obtaining an X-ray intensity of Al2O3 at a diffraction angle (2θ) of 35.152°;
- a fourth step of obtaining a first relative X-ray intensity, and the first relative X-ray intensity is a proportion (%) of the X-ray intensity of GdAlO3 obtained by the second step relative to the X-ray intensity of Gd2O2S obtained by the first step;
- a fifth step of obtaining a second relative X-ray intensity, and the second relative X-ray intensity is a proportion (%) of the X-ray intensity of Al2O3 obtained by the third step relative to the X-ray intensity of Gd2O2S obtained by the first step,
- a sixth step of estimating the ratio of GdAlO3 to Gd2O2S obtained by the first relative X-ray intensity, and
- a seventh step of estimating the ratio of Al2O3 to Gd2O2S obtained by the second relative X-ray intensity.
Dependencies are inferred from the claim text.