Microwave-Induced Combustion Synthesis and Ion Conductivity of Ce1-xLaxO2-1/2x Ceramics
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概要
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Ce1-xLaxO2-1/2x nanopowders were successfully synthesized by a microwave-induced combustion process. The phase identification, ionic conductivity and thermal expansion coefficient of Ce1-xLaxO2-1/2x ceramics were investigated in the current study. The results revealed that the bulk densities of Ce1-xLaxO2-1/2x ceramics sintered at 1450 °C for 3 h were all greater than 94% of the in theoretical densities, the maximum ionic conductivity of the sintered specimens was 0.047 S/cm at 850 °C for Ce0.84La0.16O1.92. Moreover, the minimum activity energy $E_{\text{a}}$ determined from 500 to 850 °C for Ce0.84La0.16O1.92 was 0.759 eV. It is found that the ionic conductivity increased with decreasing thermal expansion coefficient. For Ce1-xLaxO2-1/2x ceramics, the ionic conductivity increased with La doping concentration until $x=0.16$, and then decreased.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2006-07-15
著者
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Fu Yen-pei
Department Of Materials Science And Engineering National Dong Hwa University
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Fu Yen-Pei
Department of Materials Science and Engineering, National Dong Hwa University, Shou-Feng, Hualien 974, Taiwan
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