Thermal expansion of solid deuterohydrogen at helium temperatures

For the first time, the thermal expansion of solid deuterohydrogen (HD) is studied in the temperature range 1.2 to 5 K. The isotopic impurity concentrations are 1.5% H2 and 0.4% D2, the other impurities totalling less than 5·10 −4%. It is shown that the thermal expansion coefficient of solid HD can be described by the expression αHD (K−1) = 1.38·10−7T3 in the investigated temperature range. The isothermal compressibility χT = (34 ± 6)·10−10 Pa−1 is predicted on the basis of the experimental results and literature data.

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