首页 | 本学科首页   官方微博 | 高级检索  
     


Ionic conduction in BaxCe0.8Pr0.2O3-
Authors:WANG Maoyuan
Affiliation:aSchool of Chemistry and Chemical Engineering, Yancheng Teachers University, Yancheng 224051, China
Abstract:
BaxCe0.8Pr0.2O3–α (x=0.98–1.03) ceramics were prepared by high temperature solid-state reaction. X-ray diffraction (XRD) patterns showed that the materials were perovskite-type orthorhombic single phase. By using gas concentration cell and AC impedance spectroscopy methods, the electrical conduction behavior of the materials was investigated in different gases at 500–900 °C. The influence of nonstoichiometry in the materials with x≠1 on conduction properties was studied and compared with that in the material with x=1. The results indicated that Ba1.03Ce0.8Pr0.2O3–α was a pure protonic conductor, and Ba0.98Ce0.8Pr0.2O3–α was a mixed conductor of protons and electrons in wet hydrogen at 500–900 °C. BaCe0.8Pr0.2O3–α was a pure protonic conductor in 500–600 °C, and a mixed conductor of protons and electrons above 600 °C in wet hydrogen. In 500–900 °C, they were all mixed conductors of oxide ions and electronic holes in dry air, and mixed conductors of protons, oxide ions and electronic holes in wet air. Both the protonic and oxide ionic conductivities increased with increasing barium content in the materials in wet hydrogen, dry air and wet air, respectively.
Keywords:BaxCe0.8Pr0.2O3–  α     ionic conduction   gas concentration cell   AC impedance   nonstoichiometry   rare earths
本文献已被 维普 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号