The lower limit of thermal conductivity in multicomponent solutions of rare gas solids
V.A. Konstantinov, A.V. Karachevtseva, V.P. Revyakin, and V.V. Sagan
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
Received October 24, 2018
The isochoric thermal conductivity of Kr0.63Xe0.37 solid solution has been investigated for three samples with different molar volumes in the temperature range from 80 K to the onset of melting, as well as the thermal con-ductivity of the ternary (Kr0.63Ar0.185Xe0.185) and quaternary (Kr0.63Ar0.12Xe0.12(CH4)0.13) solid solutions. It is found that for multi-component alloys, the thermal conductivity reaches a minimum, whereby adding more impurity atoms in the solid solution does not affect the thermal conductivity in agreement with the recent nonequilibrium molecular dynamics calculations for argon. The phonon contribution to the total thermal conductivity depends significantly on molar volume of sample and impurity concentration, in contrast to the contribution of diffusive modes, which is practically independent of these factors.
Key words: thermal conductivity, rare gas solids, solid solutions, phonon, diffuson.