Cold storage material particle, cold storage device, refrigerator, cryopump, superconducting magnet, nuclear magnetic resonance imaging apparatus, nuclear magnetic resonance apparatus, magnetic field application type single crystal pulling apparatus, and method for producing cold storage material particle

Abstract

A cold storage material particle of an embodiment includes at least one first element selected from the group consisting of a rare earth element, silver (Ag), and copper (Cu) and a second element that is different from the first element and forms a multivalent metal ion in an aqueous solution, in which an atomic concentration of the second element is 0.001 atomic % or more and 60 atomic % or less, and a maximum value of volume specific heat at a temperature of 20K or less is 0.3 J/cm3·K or more.

Dependencies are inferred from the claim text.