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首页> 外文会议>Fourth International Symposium on Ionic and Mixed Conducting Ceramics, null >ELECTRON AND HOLE CONDUCTIVITY OF ZrO_2-CeO_2-YO_(1.5) SOLID SOLUTIONS
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ELECTRON AND HOLE CONDUCTIVITY OF ZrO_2-CeO_2-YO_(1.5) SOLID SOLUTIONS

机译：ZrO_2-CeO_2-YO_（1.5）固溶体的电子和空穴导电率

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摘要

The electronic conductivity of [(ZrO_2)_(1-x)(CeO_2)_(0.8)(YO_(1.5))_(0.2) (ZCY, x = 0～1, 0.1 step) solid solutions at 1073K was measured by DC-polarization method with Hebb-Wagner's ion blocking cell as a function of oxygen partial pressure(P(O_2)). The electronic conductivity of ZCYs with medium Ce contents (x - 0.3 and 0.5) depends on the P(O_2)~(-1/4) in a range of P(O_2) > 10~(-1) MPa, indicating that the electron is the dominant species of the electronic conduction. The electronic conductivity of ZYCs with high Ce contents (x = 0.7 ～ 1.0) deviates from the P(O_2)~(-1/4) dependence in a range of P(O_2) > 10~(-6) MPa, which indicates that the dominant conductive species changes from electron to hole with increasing the P(O_2). The composition dependence of the electron conductivity can be explained in terms of the enhanced stabilization of Ce~(3+) in the solid solutions and the resulting shift of the redox equilibria between Ce~(4+) and Ce~(3+). On the other hand, the composition dependence of hole conductivity implies that the logarithmic hole conductivity gradually increases with Ce concentration along a linear line connecting yttria stabilized zirconia (ZCY, x = 0) and yttria-doped ceria (ZCY, x = 1). For the 20mol%-yttria-doped ceria (ZCY, x = 1) electrolyte, the hole conduction was clearly observed in the higher P(O_2) region and the activation energy of the electron and the hole conduction were 2.23 eV and 1.26 eV, respectively.
机译：[1071]固溶体的[（ZrO_2）_（1-x）（CeO_2）_（0.8）（YO_（1.5））_（0.2）（ZCY，x = 0〜1，0.1级）的电子电导率通过Hebb-Wagner离子阻挡电池的直流极化方法是氧分压（P（O_2））的函数。 Ce含量中等（x-0.3和0.5）的ZCYs的电子电导率在P（O_2）> 10〜（-1）MPa的范围内取决于P（O_2）〜（-1/4），表明电子是电子传导的主要种类。 Ce含量高（x = 0.7〜1.0）的ZYCs的电子电导率在P（O_2）> 10〜（-6）MPa的范围内偏离P（O_2）〜（-1/4）依赖性。随着P（O_2）的增加，主要的导电物质从电子变为空穴。电子电导率的成分依赖性可以用固溶体中Ce〜（3+）增强的稳定性以及Ce〜（4+）和Ce〜（3+）之间氧化还原平衡的变化来解释。另一方面，空穴电导率的组成依存性意味着对数空穴电导率随着Ce浓度沿着连接氧化钇稳定的氧化锆（ZCY，x = 0）和氧化钇掺杂的二氧化铈（ZCY，x = 1）的线性线逐渐增加。对于掺杂20摩尔％氧化钇的二氧化铈（ZCY，x = 1）电解质，在较高的P（O_2）区域清晰地观察到空穴传导，并且电子和空穴传导的活化能分别为2.23 eV和1.26 eV，分别。

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