Abstract
The low-temperature plasticity of solid polycrystalline parahydrogen doped with an isotopic impurity (deuterium) is studied. The dependences of the rate of steady-state creep in p-H2 on the impurity concentration and stress are obtained. The deformation of p-H2 is described with inclusion of the zero-point mean-square displacements 〈x2〉 of particles making up a crystal. The calculated and experimental values of 〈x2〉 are compared for two possible isotope molecules (HD and D2) at three stress levels. A correlation between the 〈x2〉 values and an increase in the force constants of a p-H2 crystal doped with the isotopic impurity is established. An increase in the mean-square displacements of p-H2 with the tensile load is discussed. Deformation-induced purification of a p-H2 crystal from the isotopic impurity is suggested to occur.
Published Version
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