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Mixed Conduction in BaCe0.8Pr0.2O3-α Ceramic
Mao-yuan Wang, Li-gan Qiu¤
School of Chemistry and Chemical Engineering, Yancheng Teachers College, Yancheng 224051, China
Abstract:
BaCe0.8Pr0.2O3-α ceramic was synthesized by high temperature solid-state reaction. The structural characteristics and the phase purity of the crystal were determined using powder X-ray diffraction analysis. By using the methods of AC impedance spectroscopy, gas concentration cell and electrochemical pumping of hydrogen, the conductivity and ionic transport number of BaCe0.8Pr0.2O3-α were measured, and the electrical conduction behavior of the material was investigated in different gases in the temperature range of 500-900 ffiC. The results indicate that the material was of a single perovskite-type orthorhombic phase. From 500 ffiC to 900 ffiC, electronic-hole conduction was dominant in dry and wet oxygen, air or nitrogen, and the total conductivity of the material increased slightly with increasing oxygen partial pressure in the oxygen partial pressure range studied. Ionic conduction was dominant in wet hydrogen, and the total conductivity was about one or two orders of magnitude higher than that in hydrogen-free atmosphere (oxygen, air or nitrogen).
Key words:  BaCe0.8Pr0.2O3-α, AC impedance, Gas concentration cell, Electrochemical pumping of hy-drogen, Mixed conduction
FundProject:国家自然科学基金(No.20771079)和江苏省自然科学基金(No.07KJB150126)
Mixed Conduction in BaCe0.8Pr0.2O3-α Ceramic
王茂元, 仇立干¤
盐城师范学院化学化工学院,盐城224051
摘要:
以高温固相反应法合成了BaCe0.8Pr0.2O3-α陶瓷,用X射线衍射法对其结构进行了表征. 用交流阻抗谱、气体浓差电池和氢泵方法测定了材料在500-900 ffiC、不同气氛中的电导率以及离子迁移数,研究了材料的导电特性. 结果表明,该陶瓷材料为单一钙钛矿型斜方晶结构. 在500-900ffiC下,在干燥和潮湿的氧气、空气和氮气气氛中,材料以电子空穴导电为主,其总电导率随氧分压的增加而稍有增加;在潮湿的氢气气氛中,材料以离子导电为主,其总电导率比不含氢气气氛(O2,air,N2)中的电导率高一到两个数量级.
关键词:  BaCe0.8Pr0.2O3-α,阻抗谱,气体浓差电池,氢泵,混合导电性
DOI:10.1088/1674-0068/21/03/286-290
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