Thermodynamics of molecular librational motion in <i>β</i>-O2
A. P. BrodyanskiĭPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovV. A. SlyusarevPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kovYu. A. FreĭmanPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Khar’kov
ABI
Abstract
We consider the effect of librational anharmonicity on thermodynamic properties of β-O2. It is shown that, unlike in crystals of the N2 type, the sign of the anharmonicity correction to the librational specific heat in β-O2 is negative, and in a rigid lattice the librational subsystem does not manifest instability with respect to transition to the orientationally disordered state. The nature of the transition to the γ-phase is discussed.
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