Abstract
The results of the study of the crystal structure, ionic conductivity and local structure of (ZrO2)1- х(Gd2O3)x and (ZrO2)1- х(Y2O3)x solid solutions in a wide range of compositions (x = 0.04-0.38) are given. Studies were performed on crystals obtained by the method of directional crystallization of the melt in a cold crucible. The results of the study of the local structure of the solid solutions of the ZrO2-Y2O3 and ZrO2-Gd2O3 systems revealed the formation of optical centers, which reflect the localization of oxygen vacancies in the crystal lattice depending on the concentration of the stabilizing oxide. It was shown that the local crystalline environment of Eu3+ ions in solid solutions (ZrO2)1- х(Y2O3)x and (ZrO2)1- х(Gd2O3)x is determined by the concentration of the stabilizing oxide and practically does not depend in this case on the type of the stabilizing oxide. The maximum conductivity of ZrO2-Gd2O3 solid solutions is shifted to higher concentrations relative to the maximum conductivity of ZrO2-Y2O3 solid solutions and was observed on crystals corresponding to the t´´ phase. The results of the study of the crystal and local structure of solid solutions of the ZrO2-Gd2O3 and ZrO2-Y2O3 systems allowed us to isolate the concentration regions of stabilizing oxides in which the ionic conductivity is determined mainly by the phase composition or localization of oxygen vacancies in the crystal lattice.
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