The effect of n-H2 impurity on the heat capacity of solid Ne

Автор(и)

  • M.I. Bagatskii B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
  • I.Ya. Minchina B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
  • V.S. Parbuzin Lomonosov Moscow State University, Moscow 119899, Russia

DOI:

https://doi.org/10.1063/1.3075948

Ключові слова:

heat capacity; hydrogen-containing alloys; phase transitions.

Анотація

The alloy of Ne - 5.1%n-H2 was investigated calorimetrically under equilibrium vapor pressure in an interval of 0.9–25 K. The magnitudes and the temperatures dependencies of the heat capacity Csol(T) of the alloy at T = 11–20 K are strongly dependent on the conditions of sample preparation. The temperatures dependencies of the Csol(T) of the sample prepared in a calorimeter by direct condensation of a gas mixture at T = 15 K exhibit a smeared maximum near the triple point temperature of hydrogen and a phase transition at T = 17.1 K. The detected features of Csol(T) indicate that the preparation of the solid Ne – n-H2 from a gas phase leads to the formation of a nonequilibrium long-living phase Ne with large H2 concentrations and a small portion of H2 inclusions with low Ne concentrations. The phase transition is caused by decompositions of this phase. The phase dose not recover on cooling the sample after the phase transition. It is found that the rate of the ortho-para conversion of the H2 molecules in the solid Ne – n-H2 solutions higher than that of solid H2.

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Опубліковано

2008-12-26

Як цитувати

(1)
Bagatskii, M.; Minchina, I.; Parbuzin, V. The Effect of n-H2 Impurity on the Heat Capacity of Solid Ne. Fiz. Nizk. Temp. 2008, 35, 204-207.

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