Heat capacity of Kr-O2 solutions at helium temperatures
P. I. MuromtsevB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, 310164 KharkovM. I. Bagatskiı̆B. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, 310164 KharkovV. G. Manzheliı̆B. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, 310164 KharkovI. Ya. MinchinaB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, 310164 Kharkov
ABI
Аннотация
The heat capacity C of Kr–n16O2 solid solutions is investigated in the temperature range 0.5–10 K for oxygen concentration n varying between 0.26 and 10 mol.% under equilibrium vapor pressure. The contribution ΔC(T) to heat capacity due to spin-rotational degrees of freedom of O2 molecules is separated. The ΔC(T) peak observed at low impurity concentrations (n=0.26 mol.%) near 1 K is very close to the ΔC(T) peak of the solution Ar–0.13 mol.% l6O2. The experimental results are compared with theoretical models. At higher oxygen concentrations, the glass-like behavior of Kr–O2 solutions is less pronounced as compared to Kr–N2 solutions. An explanation of this difference is also given.
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