Cryogenic regenerator material, regenerative cryocooler, and system including regenerative cryocooler

摘要

According to an embodiment, a cryogenic regenerator material contains a silver oxide. A molar ratio of silver atoms to oxygen atoms contained in the cryogenic regenerator material: Ag/O is 1.0 or more and 4.0 or less. The cryogenic regenerator material contains at least one selected from AgO, Ag₂O and Ag₃O as the silver oxide.