Structural and thermodynamic properties of disordered <i>hcp</i> O2–Kr solutions

Abstract

X-ray studies of supercooled orientationally disordered hexagonal close-packed phase of O2–Kr solutions are carried out in the temperature range from 5 to 43 K for O2 concentrations varying between 20 and 50%. For T &amp;lt; 30 K, the lattice parameters, molar volumes and thermal expansion coefficients exhibit anomalous behavior, which is assumed to be due to the slowing down of the rotational motion and the enhancement of magnetic and orientational ordering in the molecular subsystems of the solutions at low temperatures. The results are compared with those obtained earlier for O2–Ar solutions. Some ideas about the nature of short-range orientational order in frozen disordered phases of binary systems of cryocrystals are proposed.

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DOI

10.1063/10.0032250

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