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Mass-spectrometric analysis of diffusion and solubility of helium in cerium-gadolinium ceramics with a submicrocrystalline structure

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Abstract

Diffusion and solubility of helium in Ce0.8Gd0.2O1.9 − δ ceramics (δ = 0, 0.015) with a submicrocrystal structure are studied by thermodesorption of helium from preliminarily saturated (in the gas phase) crystals at temperatures of 613 and 673 K in the saturated pressure range 0–21 MPa. It is shown that, in this ceramics (δ = 0), the defect-trap diffusion mechanism operates. The main positions for dissolution are neutral anion vacancies formed as a result of thermal dissociation of impurity-vacancy complexes and saturated up to ∼1 × 1019 cm−3 at P = 6 MPa and T = 673 K. The dissociation energy of the complex and the energy of helium dissolution in the neutral anion vacancy are estimated at ∼2 eV and below −0.3 eV, respectively.

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Authors and Affiliations

  1. Ural State Technical University (UPI), ul. Mira 19, Yekaterinburg, 620002, Russia

    M. A. Kovalenko, A. Ya. Kupryazhkin & V. V. Ivanov

Authors
  1. M. A. Kovalenko
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  2. A. Ya. Kupryazhkin
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  3. V. V. Ivanov
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Correspondence to A. Ya. Kupryazhkin.

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Original Russian Text © M.A. Kovalenko, A.Ya. Kupryazhkin, V.V. Ivanov, 2010, published in Zhurnal Tekhnicheskoĭ Fiziki, 2010, Vol. 80, No. 1, pp. 138–141.

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Kovalenko, M.A., Kupryazhkin, A.Y. & Ivanov, V.V. Mass-spectrometric analysis of diffusion and solubility of helium in cerium-gadolinium ceramics with a submicrocrystalline structure. Tech. Phys. 55, 137–140 (2010). https://doi.org/10.1134/S1063784210010226

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  • DOI: https://doi.org/10.1134/S1063784210010226

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