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Pressure-induced improvement of grain boundary properties in yttrium-doped BaZrO3
Lei Wu; LiDong Dai; HePing Li; YuKai Zhuang; KaiXiang Liu
2016
Source PublicationJournal of Physics D: Applied Physics
Volume49Issue:34
Abstract
Yttrium-doped BaZrO3 (BZY) is a promising electrolyte for intermediate-temperature protonic ceramic fuel cells. However, BZY exhibits a high resistance because of the blocking effect of the grain boundaries. In this study, the effect of pressure on undoped and 5% yttrium-doped BaZrO3 (BZY0 and BZY5) were investigated at 0.45-24.01 GPa and 273-673 K with a diamond anvil cell. Their bulk, grain boundary, and total electrical conductivities were determined by impedance spectroscopy and direct-current resistance measurement. Both samples tended to show increasing electrical conductivity with increasing pressure, although each showed a discontinuous inflexion point (at similar to 14.54 GPa for BZY0 and at similar to 11.11 GPa for BZY5) indicating a phase transition from a cubic to a tetragonal structure. The samples showed a 3.43 GPa difference in the onset pressure of the structure change. Characteristic parameters, including space charge potential, relaxation frequency, and transport activation energy, were obtained before and after the phase transition. The results suggest that pressure significantly improves oxygen ion conduction in acceptor-doped perovskites oxides.
Subject Area地球深部物质与流体作用地球化学
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/352002/6535
Collection地球内部物质高温高压实验室_地球内部物质高温高压实验室_期刊论文
Recommended Citation
GB/T 7714
Lei Wu,LiDong Dai,HePing Li,et al. Pressure-induced improvement of grain boundary properties in yttrium-doped BaZrO3[J]. Journal of Physics D: Applied Physics,2016,49(34).
APA Lei Wu,LiDong Dai,HePing Li,YuKai Zhuang,&KaiXiang Liu.(2016).Pressure-induced improvement of grain boundary properties in yttrium-doped BaZrO3.Journal of Physics D: Applied Physics,49(34).
MLA Lei Wu,et al."Pressure-induced improvement of grain boundary properties in yttrium-doped BaZrO3".Journal of Physics D: Applied Physics 49.34(2016).
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