Theory of the <i>β</i>–<i>γ</i> transition in solid oxygen
A. P. BrodyanskiĭPhysicotechnical Institute of Low Temperatures, Academy of Sciences, Ukrainian SSR, KharkovYu. A. FreĭmanPhysicotechnical Institute of Low Temperatures, Academy of Sciences, Ukrainian SSR, Kharkov
ABI
Abstract
We consider a model of “discs and spheres” as a description of γ-O2, in which the nutational motion of the precessing molecules is described in terms of a quantum approach, while the remaining orientational degrees of freedom are described classically. Using a modified Kohin potential, we calculate the constants of the molecular and crystalline fields for the precessing molecules in γ-O2, and we show that their orientational state may be described by a negative value of the order parameter. It is shown that the β-γ transition in solid oxygen is related to a change in sign of the order parameter in the orientational subsystem and may be reduced to a transition of the order–order type.
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