CRYOCOOLER REGENERATOR MATERIAL, CRYOGENIC REGENERATOR, REGENERATIVE CRYOCOOLER AND SYSTEM COMPRISING REGENERATIVE CRYOCOOLER

摘要

One embodiment provides a cryogenic regenerator material containing as the main constituent at least one compound (A) containing at least one metallic element M and at least one non-metallic element X selected from O, S, N and F. The compound (A) in the cryogenic regenerator material has a half width of a main peak of 0.2 degrees or more obtained by the powder X-ray diffraction measurement.