Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1450538 | Acta Materialia | 2006 | 7 Pages |
Abstract
Ce0.8Sm0.2O1.9 (SDC) powder is synthesized by a simplified carbonate coprecipitation method, and the powder can be sintered to densify at 1100–1200 °C. SDC sintered at 1200 °C exhibits 98.6% of the theoretical density and an effective conductivity (σeff) of 0.038 S cm−1 at 700 °C. Arrhenius plots of log(σeffT) vs. 1/T for SDC sintered between 900 and 1300 °C are curved at about 600 °C, giving activation energies of ∼0.9 eV below 600 °C and ∼0.8 eV above 600 °C. SDC sintered at 1400 °C, however, shows decreased σeff with a higher activation energy of ∼1.0 eV independent of temperature within 400–800 °C, and pinholes appear at tri-junctions of grain boundaries because of reduction of CeO2 at high temperatures.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Haibin Li, Changrong Xia, Minhui Zhu, Zuoxing Zhou, Guangyao Meng,