Thermal expansion of solid parahydrogen at helium temperatures
A. N. AleksandrovskiĩPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovА. В. СолдатовPhysicotechnical 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, KharkovV. V. PaleiPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
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Thermal expansion of solid parahydrogen is investigated in the temperature range from 0.9 to 5 K. The content of the orthomodification in parahydrogen is 0.13 at. %, and that of nonhydrogen impurities is less than 2·10−3 at. %. No anisotropy in thermal expansion was observed within the experimental error. The temperature dependence of the linear expansion coefficient can be described by the expression α = 1.82·10−7 T3. The obtained values of a are in good agreement with the available data on compressibility and (∂p/∂T)T. The Grüneisen coefficient is γ = 3αV/CTχT = 2.00±0.25.
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