Mechanical and electrical properties of Al_2O_3ZCe_(0.8)Y_(0.2)0_(1.9) composite electrolytes

Hongmei Xu; Hongge Yan; Zhenhua Chen

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Mechanical and electrical properties of Al_2O_3ZCe_(0.8)Y_(0.2)0_(1.9) composite electrolytes

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The Al_2O_3/Ce_(0.8)Y_(0.2)O_(1.9) composites, with Al_2O_3 concentration ranging from 0 to 10mol percent, were prepared by a low-temperature combustion process. The effects of Al_2O_3 addition on the rlexural strength and electrical conductivity of Y~(3+)-doped ceria were investigated, and the mechanism was analyzed. The experimental results showed that Al_2O_3 enhanced significantly the flexural strength of the as-sintered Ce_(0.8)Y_(0.2)O_(1.9). The flexural strength was 270 MPa for the specimen containing 10mol percent Al_2O_3 while the flexural strength of the undoped Ce_(0.8)Y_(0.2)O_(1.9) specimen was only 121 MPa. Impedance analysis showed that ionic conductivity of the Al_2O_3/Ce_(0.8)Y_(0.2)O_(1.9) composite electrolytes decreased and the activation energy increased when the concentration of Al_2O_3 was within the solubility. When the content of Al_2O_3was above its solubility limit in Ce_(0.8)Y_(0.2)O_(1.9), the bulk resistance was constant and the grain boundary conductivity increased because of the "scavenging" effect of Al_2O_3. When the concentration of Al_2O_3 was over 5 mol percent, the grain boundary conductivity began to reduce because of the "blocking" effect of Al_2O_3 particles at the grain boundaries. The activation energy for the bulk conductivity and the grain boundary conductivity retained constant when the concentration of Al_2O_3 was over its solubility limit in Ce_(0.8)Y_(0.2)O_(19).

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来源
《Materials Science & Engineering, B. Solid-State Materials for Advanced Technology》 |2007年第3期|85-90|共6页
作者
Hongmei Xu; Hongge Yan; Zhenhua Chen;
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作者单位

Institute of Material Surface Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China;

Department of Chemistry and Biochemistry, University of Maryland,College Park, Maryland 20742;

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原文格式 PDF
正文语种英语
中图分类工程材料学;
关键词
Solid electrolyte; Alumina; Electrical conductivity; Flexural strength; Low-temperature combustion;

Mechanical and electrical properties of Al_2O_3ZCe_(0.8)Y_(0.2)0_(1.9) composite electrolytes

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