Isotopic effects in the heat capacity of solid hydrogens with central intermolecular interactions
M. I. Bagatskiı̆Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovI. Ya. MinchinaPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. G. Manzheliı̆Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovP. I. MuromtsevPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovА. И. КривчиковPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. S. ParbuzinPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
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Heat capacities of solid deuterohydrogen (0.5–6 K) and orthodeuterium (1–6 K) are measured at equilibrium vapor pressure. The limiting values of the Debye temperature Θ00 estimated at zero temperatures and pressure for these substances are found to be 115 ± 1.0 K and 111.4 ± 1.0 K, respectively. It is shown that for equal molar volumes of quantum crystals of para- and deuterohydrogen and orthodeuterium, the relation Θ0√μ = constant is satisfied, where μ is the molecular mass of a substance. The values of the Debye temperature for other hydrogen isotopes are estimated. The conversion rate constant (from orthohydrogen to deuterohydrogen) is found to be K = 8.0 × 10−3 · h−1.
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