| 晶界在多晶ZrO2基固体电解质中的作用 |
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| 引用本文： | 郭新,袁润章,孙尧卿,崔崑.晶界在多晶ZrO2基固体电解质中的作用[J].物理学报,1996,45(5):860-868. |
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| 作者姓名： | 郭新 袁润章 孙尧卿 崔崑 |
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| 作者单位： | (1)华中理工大学材料科学与工程系,武汉430074; (2)武汉工业大学材料复合新技术国家重点实验室,武汉430070 |
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| 基金项目： | 中国博士后科学基金资助的课题 |
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| 摘 要： | 在实验的基础上将ZrO2基固体电解质的晶界分为三类:“清洁”晶界、含非晶相的晶界和含晶态相晶界,并分析了各类晶界的形态与性质,其中根据有效介质理论的计算,晶态晶界相的电导率约为基体的三倍,因而据此提出了一个运用“晶界工程”进一步提高ZrO2导电性的方法。用理论模型分析了各类晶界对ZrO2氧传感器输出电势的影响。
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| 关 键 词： | 多晶 陶瓷 固体电解质 二氧化锆 晶界 |
| 收稿时间： | 1995-02-21 |
ROLE OF GRAIN BOUNDARIES IN POLYCRYSTALLINE ZIRCONIA-BASED SOLID ELECTROLYTES |
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| GUO XIN,YUAN RUN-ZHANG,SUN YAO-QING and CUI KUN.ROLE OF GRAIN BOUNDARIES IN POLYCRYSTALLINE ZIRCONIA-BASED SOLID ELECTROLYTES[J].Acta Physica Sinica,1996,45(5):860-868. |
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| Authors: | GUO XIN YUAN RUN-ZHANG SUN YAO-QING and CUI KUN |
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| Abstract: | On the basis of experiments, the ZrO2 grain boundaries are classified into three types: the " clean" grain boundaries, the grain boundaries with amorphous phases and the grain boundaries with crystal phases. The structure and property of the three types of grain boundaries are analyzed on .the grounds of microstructure and lattice defects. The conductivity of the crystal grain boundary phases is calculated with the effective-medium theory and found to be three times higher than that of the matrix, and an idea of further enhancing the ionic conductivity of ZrO2 by modifying grain boundaries is thus proposed. The effect of the ZrO2 grain boundaries on the emf of the oxygen sensor is discussed with simplified models. |
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