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首页> 外文会议>International symposium on solid oxide fuel cells >EFFECT OF MOISTURE ON THE PHASE STABILITY OF Y_2O_3-Bi_2O_3 SOLID ELECTROLYTES
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EFFECT OF MOISTURE ON THE PHASE STABILITY OF Y_2O_3-Bi_2O_3 SOLID ELECTROLYTES

机译：水分对Y_2O_3-BI_2O_3固体电解质相位稳定性的影响

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摘要

Bi_2O_3-based cubic solid solutions containing 25% Y_2O_3 undergo transformation to a rhombohedral phase when annealed at temperatures ≤ 650°C. The stability of solid electrolytes in the humid environment is extremely important for practical applications. The rhombohedral phase decomposed to α-monoclinic phase after immersing in water at 70°C for 50 h. Many cracks were found in the decomposed area. These cracks may be caused by the volume change during the decomposition of rhombohedral to a-phase. However, the cubic phase remained unaffected under the same treatment. In the humid environment, the difference in phase stability between cubic and rhombohedral phases is related to the difference in crystal structures. For Y_2O_3-Bi_2O_3 to be used as the solid electrolyte in electrochemical devices, the transformation from cubic to rhombohedral phase needs to be suppressed because the rhombohedral phase will not only lower the conductivity but is also very unstable in a humid environment.
机译：基于Bi_2O_3的立方固溶液，当在温度≤650℃时退火时，含有25％Y_2O_3的转化为菱形相。潮湿环境中固体电解质的稳定性对于实际应用非常重要。在70℃下浸入水中50小时后分解为α-单斜相的rhombohedral相。在分解区域中发现了许多裂缝。这些裂缝可能是由rhombenheheheh面向到A阶段分解过程中的体积变化引起的。然而，在同一治疗下，立方相仍未受到影响。在潮湿环境中，立方和菱形相之间的相位稳定性差异与晶体结构的差异有关。对于用作电化学器件中的固体电解质的Y_2O_3-BI_2O_3，需要抑制从立方体到菱体相的转化，因为菱形相不仅降低导电性，而且在潮湿环境中也是非常不稳定的。

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