4K-GM Cryocooler Performance and Thermal Conductivity of Ho_xEr_(1-x)N

摘要

Ho_xEr_(1-x)N (x=0.25, 0.5, 0.75) samples were synthesized by nitriding of Ho_xEr_(1-x) alloy bars and their thermal conductivity κ were measured. The measured κ values were comparable to those of stainless steel and Er_3Ni. Ho_(0.5)Er_(0.5)N showed the highest k of the present three samples. The thermal diffusivity calculated from the κ and the specific heat indicates that Ho_(0.5)Er_(0.5)N is a very promising regenerator material for the cryocoolers. The electrical resistivity ρ was also measured as a function of temperature.