Study of phase transitions in the solid solutions CH4−CD4
A. I. ProkhvatilovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovA. P. IsakinaPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
ABI
Abstract
The solid solutions CH4−CD4 were studied by the x-ray method over a wide range of temperatures and concentrations. The characteristics of the phase transitions were studied and it was established that in solutions with a “frozen” high-temperature composition of spin modifications a linear concentration dependence of the phase-transition temperatures holds. It is shown that in the region of weak solid solutions xCD4 < 15% the metastability of the phase III is a result of the spin-nuclear conversion of methane molecules. The change in the tetragonality of the lattice of the low-temperature phase of the solid solutions as a function of the concentration of deutero-methane was studied.
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