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Hydrogen in amorphous and crystalline ytterbium films

  • Metals. Superconductors
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Abstract

Ytterbium vapor condensation on a liquid-helium cooled substrate in a hydrogen atmosphere is used to obtain Yb-H films containing up to 55 at.% hydrogen. Various thermodynamic and kinetic parameters of the transition of these films from the amorphous to the crystalline state (a→c transition) are investigated along with the electrical conductivity of these states. It is shown that the investigated properties of Yb-H films containing up to 40 at.% hydrogen are essentially indistinguishable from those of pure Yb films in the temperature interval 4.2–293 K. Increasing the hydrogen concentration to 55 at.% leads to an insignificant increase in the electrical resistivity, the kinetic temperature, and the activation energy of the a→c transition, and also to a decrease of the propagation speed of self-maintaining avalanche (explosive) crystallization. Reasons for the observed influence of hydrogen on the properties of Yb-H films are analyzed. The examined low-temperature Yb-H condensates can be characterized as a “frozen” solid solution of hydrogen in ytterbium in the temperature interval 4.2–293 K. Storing such films at room temperature leads to the formation of ionic ytterbium dihydride YbH2.

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Authors and Affiliations

  1. Khar’kov Physicotechnical Institute, 310108, Khar’kov, Ukraine

    V. M. Kuz’menko & A. N. Vladychkin

Authors
  1. V. M. Kuz’menko
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  2. A. N. Vladychkin
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Fiz. Tverd. Tela (St. Petersburg) 41, 177–182 (February 1999)

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Kuz’menko, V.M., Vladychkin, A.N. Hydrogen in amorphous and crystalline ytterbium films. Phys. Solid State 41, 155–159 (1999). https://doi.org/10.1134/1.1130747

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  • DOI: https://doi.org/10.1134/1.1130747

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