Transport properties of ceria–zirconia–yttria solid solutions {(CeO2)x(ZrO2)1−x}1−y(YO1.5)y (x = 0–1, y = 0.2, 0.35)
Transport properties of ceria–zirconia–yttria solid solutions {(CeO2)x(ZrO2)1−x}1−y(YO1.5)y (x = 0–1, y = 0.2, 0.35)
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二氧化铈-氧化锆-氧化钇固溶体的输运性质 {(CeO2)x(ZrO2)1−x}1−y(YO1.5)y (x = 0–1, y = 0.2, 0.35)
DOI：
10.1016/j.jallcom.2004.12.088
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发表时间：
2006
影响因子：
6.2
通讯作者：
H. Yokokawa
中科院分区：
文献类型：
--
作者：
N. Sakai;Y. Xiong;K. Yamaji;H. Kishimoto;T. Horita;M. E. Brito;H. Yokokawa
研究了{(CeO2)0.5(ZrO2)0.5}0.65(YO1.5)0.35固溶体的电子电导率、空穴电导率、氧输输性能和热膨胀行为，并与{(CeO2)1−x(ZrO2)x}0.8(YO1.5)0.2的数据进行了比较，考察了钇含量的影响。离子阻断法测得{(CeO2)0.5(ZrO2)0.5}0.65(YO1.5)0.35的电导率比{(CeO2)0.5(ZrO2)0.5}0.8(YO1.5)0.2的电导率低一个数量级。在还原气氛中，钇含量的增加抑制了由立方结构向焦绿石结构的相变。{(CeO2)0.5(ZrO2)0.5}0.65(YO1.5)0.35的氧同位素扩散系数和表面交换速率常数与{(CeO2)0.5(ZrO2)0.5}0.8(YO1.5)0.2的氧同位素扩散系数和表面交换速率常数相当。对稀土掺杂的二氧化铈也观察到由于铈离子的还原而引起的化学膨胀。讨论了该材料作为阳极衬底在固体氧化物燃料电池中的相容性。
The electron and hole conductivity, oxygen transport property and thermal expansion behavior of {(CeO2)0.5(ZrO2)0.5}0.65(YO1.5)0.35solid solution were investigated and the effect of yttrium content was examined by comparing the data with those of {(CeO2)1−x(ZrO2)x}0.8(YO1.5)0.2. The electron conductivity of {(CeO2)0.5(ZrO2)0.5}0.65(YO1.5)0.35measured by ion blocking method was one order lower than that of {(CeO2)0.5(ZrO2)0.5}0.8(YO1.5)0.2. The increase of yttrium content suppressed the phase transition from cubic to pyrochlore structure in reducing atmosphere. The oxygen isotope diffusivity and surface exchange rate constant of {(CeO2)0.5(ZrO2)0.5}0.65(YO1.5)0.35are considered to be comparable to those of {(CeO2)0.5(ZrO2)0.5}0.8(YO1.5)0.2. The chemical expansion due to the reduction of cerium ion was observed as well as for rare earth doped ceria. The compatibility of the material as an anode substrate in solid oxide fuel cells is discussed.