Structure and impedance of ZrO2 doped with Sc2O3 and CeO2
Structure and impedance of ZrO2 doped with Sc2O3 and CeO2
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DOI：
10.1016/j.matlet.2004.07.065
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发表时间：
2005-08
影响因子：
3
通讯作者：
Zhenwei Wang;Mojie Cheng;Zhonghe Bi;Yonglai Dong;Huamin Zhang;Jing Zhang;Zhaochi Feng;Can Li
中科院分区：
文献类型：
--
作者：
Zhenwei Wang;Mojie Cheng;Zhonghe Bi;Yonglai Dong;Huamin Zhang;Jing Zhang;Zhaochi Feng;Can Li
合成了Sc2O3掺杂量为10mol%，CeO2掺杂量为10mol%，Sc2O3掺杂量为10mol%，CeO2掺杂量为10mol%，XRD结果表明，烧结样品具有立方相结构。然而，拉曼光谱表明，除了主要的立方相，第二相也存在于烧结样品。CeO2的加入可以提高立方相的含量，但当CeO2含量高达10mol%时，仍存在少量的亚稳四方相（t′相）。近紫外拉曼光谱表明，变形的四方结构在晶界占主导地位。CeO2的加入减少了晶界处的杂质，高CeO2含量样品的近紫外拉曼光谱在晶界处没有发现杂质。阻抗测试结果表明，随着CeO2含量的增加，晶界阻抗减小，体阻抗增大。低的晶界阻抗可以归因于CeO2掺杂后形成的清洁晶界，体阻抗的增加是由于大的Ce（IV）离子的阻挡效应。
Scandia and ceria doped zirconia samples, with 10 mol% Sc2O3and different content of CeO2, were synthesized and characterized. The XRD results depict that the sintered samples have a cubic phase structure. However, Raman spectra show that besides the main cubic phase, a secondary phase is also present in the sintered samples. The addition of CeO2can raise the content of the cubic phase, but the minor meta-stable tetragonal phase (t′-phase) exists even at the CeO2content as high as 10 mol%. The near-UV Raman spectra indicate that the deformed tetragonal structure predominates at the grain boundary. The addition of CeO2can reduce the impurity at grain boundary, and no impurity can be found by near-UV Raman spectroscopy at the grain boundary of the samples with high CeO2content. The impedance measurements show that with the increase of CeO2content, the impedance of grain boundary decreases and the bulk impedance increases. The low impedance of grain boundary can be attributed to the formation of a clean grain boundary upon CeO2doping, and the increase of the bulk impedance is due to the blocking effect of the large Ce(IV) ions.