Thermal Conductivity of Crystalline Deuterated Methane

The preliminary results of thermal conductivity experiment carried out on solid CD 4 at equilibrium vapor pressure in the temperature range 1.2–30 K are reported. The dependence of the thermal conductivity on temperature shows a clear change at the temperatures 27.0 and 22.1 K, which correspond to the phase transitions, from phase I to II and from phase II to III, respectively. In the orientationally ordered phase III of the deuterated methane, the thermal conductivity of CD 4 depends on thermal history of the sample.