Abstract
Measurements were made of the specific heat (in the temperature range 80–400 K), electrical resistivity (4.2–300 K), thermo-emf (4.2–300 K), thermal conductivity (7–300 K), magnetic susceptibility (4.2–400 K), and lattice parameters (30–300 K) of the alloy NbH0.83. The λ′→λβ phase transitions were studied. It was established that the structure of the niobium matrix of the hydride remains unchanged as a result of these transitions. It is shown that the β→λ phase transition (one-dimensional hydrogen ordering) is a three-stage one and is accompanied by a substantial change in the shear modulus of the hydride. The λ′ phase existing at T<110 K was determined. The electron thermal conductivity κel calculated for the λ′ phase in the range T<23 K is 25% higher than the measured thermal conductivity. In order to explain this fact and also the discontinuity in the concentration dependence of the coefficient of thermal expansion of NbHx for x≃0.83–0.84 and the approximately 1.5% compression of the NbH0.84 volume it is assumed that in the region of x c in the λ′ phase the topology of the Fermi surface of the NbHx interstitial alloy changes substantially.
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Translated from Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 118, No. 2, 2000, pp. 370–379.
Original Russian Text Copyright © 2000 by Sorokina, Wlosewicz, Plackowski, Misiorek, Sulkowski.
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Sorokina, N.A., Wlosewicz, D., Plackowski, T. et al. Characteristics of the thermodynamic and kinetic properties of NbH0.83 in the phase transition region. J. Exp. Theor. Phys. 91, 324–331 (2000). https://doi.org/10.1134/1.1311991
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DOI: https://doi.org/10.1134/1.1311991