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

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

Ural State Technical University, Ekaterinburg

Abstract: Diffusion and solubility of helium in Ce$_{0.8}$Gd$_{0.2}$O$_{1.9-\delta}$ ceramics ($\delta$ = 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 ($\delta$ = 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 $\sim$1 $\times$ 10$^{19}$ 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 $\sim$2 eV and below -0.3 eV, respectively.

Received: 22.01.2009
Accepted: 08.04.2009

 English version: Technical Physics, 2010, 55:1, 137–140

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