Study of phase transitions in the solid solutions CH4−CD4

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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