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Träfflista för sökning "WFRF:(Alexander G.) srt2:(1987-1989)"

Search: WFRF:(Alexander G.) > (1987-1989)

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1.
  • Aleksandrovski, A. N., et al. (author)
  • Anomalies of the plastic deformation of solid parahydrogen
  • 1987
  • In: Soviet Journal of Low Temperature Physics. - 0360-0335. ; 13:10, s. 623-624
  • Journal article (peer-reviewed)abstract
    • The work hardening curves σ(ε) of special-purity parahydrogen single crystals are obtained in the temperature range 2-6 °K at very low stresses (σ=5 10 - 2 g/mm2). Our study reveals a number of anomalies, in particular an effect whereby a sample recovers its dimensions after plastic deformation reaching 7%. The work hardening curves of solid neon are also obtained for comparison. The gravity-induced downward flow of parahydrogen single crystals at helium temperatures mentioned in the literature has not been observed.
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2.
  • Aleksandrovskii, A. N., et al. (author)
  • Thermal expansion of solid parahydrogen at helium temperatures
  • 1989
  • In: Soviet Journal of Low Temperature Physics. - 0360-0335. ; 15:8, s. 492-493
  • Journal article (peer-reviewed)abstract
    • 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 α are in good agreement with the available data on compressibility and ([partial derivate]p/[partial derivate]T)V. The Grüneisen coefficient is γ=3αV/CV`T=2.00 ± 0.25.
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