Peculiarities in thermal expansion of atomic cryocrystals due to oxygen impurity

Thermal expansion of Kr–O2 solutions containing 0.3, 0.6 and 1 mol.% of oxygen impurity is investigated in the temperature interval from 2 to 6 K. A low-temperature anomaly in thermal expansion of these solutions is observed. The obtained results are compared with the data on thermal expansion of the Ar–O2 solution. It is shown that theoretical models describing the behavior of the O2 impurity molecule are inapplicable for the description of thermal expansion of the solutions under investigation. An analysis of the concentration dependence of thermal expansion of the Kr–O2 solutions leads to the conclusion that the solubility of oxygen in krypton is weaker than in argon. The distortion of the Ar crystal lattice is modelled by introducing N2 impurity into the Ar–O2 solution, and the behavior of O2 molecules in such a lattice is investigated.

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