HYDRATE OF RARE EARTH METAL SULFATE, METHOD FOR PRODUCING SAME, AND CHEMICAL THERMAL STORAGE MATER

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The problem of the invention is to provide a compound useful as a chemical thermal storage material that is inexpensive, highly safe, has high reproducibility even when reacted repeatedly (high repetition durability), and also makes it possible to proceed reversibly with heat storage and heat release even in a relatively low temperature range. The invention is a hydrate of a rare earth metal sulfate having a characteristic peak at a specific diffraction angle (2θ) in an x-ray diffraction pattern measured using λ＝1.5418Å copper radiation through a monochromator.