Thermal expansion of solid hydrogens
А. В. СолдатовB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, 310164, Khar’kov, pr. lenina, 47A. N. AleksandrovskiĩB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, 310164, Khar’kov, pr. lenina, 47V. G. Manzheliı̆B. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, 310164, Khar’kov, pr. lenina, 47V. V. RaleĭB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, 310164, Khar’kov, pr. lenina, 47M. A. Strzhemechnyı̆B. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, 310164, Khar’kov, pr. lenina, 47
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The linear thermal expansion coefficient α of solid deuterium with paramodification content of 2.25% was determined in the temperature interval 1.5–5.6 K. The contributions of the translational vibrations of the lattice αlat and the rotational motion of the molecules αrot to α are separated. The temperature dependence of αlat was determined by the expression αlat = 1.475 · 10−7T3 + (4.5–7)·1010T5. The possibilities of a universal description of the thermal expansion of cryocrystals with a central interaction, including quantum crystals of hydrogen isotopes, are discussed. A theoretical description is proposed and the temperature dependence of αrot is analyzed.
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