Abstract

The results of investigating the crystal structure, ionic conductivity, and local structure of the (ZrO₂)_{1 –x}(Gd₂O₃)_x and (ZrO₂)_{1 –x}(Y₂O₃)_x (x = 0.04, 0.08, 0.10, 0.12, and 0.14) solid solutions are reported. The crystals are grown by directional crystallization of the melt in a cold container. The phase composition of the crystals is investigated by X-ray diffractometry and transmission electron microscopy. The transport characteristics are studied by impedance spectroscopy in the temperature range of 400 to 900°C. The local crystal structure is examined by optical spectroscopy. Eu³⁺ ions were used as a spectroscopic probe. The study of the local structure of the ZrO₂–Y₂O₃ and ZrO₂–Gd₂O₃ solid solutions revealed the features in the formation of optical centers, which reflect the character of localization of oxygen vacancies in the crystal lattice depending on the stabilizing oxide concentration. It is established that the local crystal environment of Eu³⁺ ions in the (ZrO₂)_{1 –x}(Y₂O₃)_x and (ZrO₂)_{1 –x}(Gd₂O₃)_x solid solutions is determined by the stabilizing oxide concentration and is practically independent of the stabilizing oxide type (Y₂O₃ or Gd₂O₃). The maximum conductivity at a temperature of 900°C is observed in the crystals with 10 mol % of Gd₂O₃ and 8 mol % of Y₂O₃. These compositions correspond to the t'' phase and are close to the interface between the cubic and tetragonal phase regions. It is found that in the ZrO₂–Y₂O₃ system the highly symmetric phase is stabilized at a lower stabilizing oxide concentration than in the ZrO₂–Gd₂O₃ system. The analysis of the data obtained makes it possible to conclude that, in this composition range, the concentration dependence of the ionic conductivity is mainly affected by the phase composition rather than the character of the localization of oxygen vacancies in the crystal lattice.

中文翻译：

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相组成和局部晶体结构对ZrO 2 -Y 2 O 3和ZrO 2 -Gd 2 O 3固溶体输运性质的影响

摘要

研究（ZrO ₂）_{1 – x}（Gd ₂ O ₃）_x和（ZrO ₂）_{1 – x}（Y ₂ O ₃）_x（x的晶体结构，离子电导率和局部结构的结果= 0.04、0.08、0.10、0.12和0.14）固溶体报告。通过在冷容器中使熔体定向结晶来生长晶体。通过X射线衍射和透射电子显微镜研究晶体的相组成。通过阻抗光谱在400至900℃的温度范围内研究传输特性。通过光学光谱检查局部晶体结构。Eu ³⁺离子用作光谱探针。ZrO ₂ -Y ₂ O ₃和ZrO ₂ -Gd ₂ O ₃的局部结构研究固溶体揭示了光学中心形成的特征，这些特征反映了取决于稳定氧化物浓度的晶格中氧空位的局部化特征。已经确定，由（ZrO ₂）_{1 – x}（Y ₂ O ₃）_x和（ZrO ₂）_{1 – x}（Gd ₂ O ₃）_x固溶体中的Eu ³⁺离子的局部晶体环境由稳定氧化物的浓度，实际上与稳定氧化物的类型（Y ₂ O ₃或Gd ₂O ₃）。在具有10mol％的Gd ₂ O ₃和8mol％的Y ₂ O ₃的晶体中观察到在900℃的温度下的最大电导率。这些成分对应于t ''相，并靠近立方相和四方相区域之间的界面。发现与ZrO ₂ -Gd ₂ O ₃相比，在ZrO ₂ -Y ₂ O ₃系统中高对称相稳定在较低的稳定氧化物浓度下。系统。对获得的数据的分析可以得出结论，在该组成范围内，离子电导率的浓度依赖性主要受相组成的影响，而不是晶格中氧空位的局部化特征。