TY - JOUR
T1 - Effect of sintering temperature on microstructure, electrical properties, and thermal expansion of perovskite-type La0.8Ca 0.2CrO3 complex oxides synthesized by a combustion method
AU - Guo, Wenfeng
AU - Wang, Yingzi
AU - Li, Adan
AU - Jiao, Tifeng
AU - Gao, Faming
N1 - Funding Information:
This project was financially supported by the Scientific and Technological Research and Development Program of Hebei Province (Grant No. 11215171), the Science & Technology Pillar Program of Hebei Province (Grant No. 11276736), the China Postdoctoral Science Foundation (Grant No. 2011M500540), and the Scientific Research Foundation for Returned Overseas Chinese Scholars of Hebei Province (Grant No. 2011052).
PY - 2013/6
Y1 - 2013/6
N2 - Perovskite-type La0.8Ca0.2CrO3 complex oxides were synthesized by a combustion method. Microstructural evolution, electrical properties, and thermal expansion behavior of the ceramics were investigated in the sintering temperature range of 1250 °C to 1450 °C. It was found that the electrical conductivity (σe) remarkably improved with increasing sintering temperature from 1250 C to 1400 C, ascribed to the development of microstructural densification, whereas it declined slightly above 1400 °C due to generation of excessive liquid. The specimen sintered at 1400 °C had a maximum conductivity of 31.6 S cm-1 at 800 °C, and lowest activation energy of 0.148 eV. The improvement of the thermal expansion coefficient (TEC) with increasing sintering temperature was monotonic as a result of the microstructural densification of the materials. The TEC of La0.8Ca0.2CrO3 sintered at 1400°C was about 10.5 × 10-6 K-1, being consistent with other components as high-temperature conductors. With respect to microstructure, electrical properties, and thermal expansion, the preferable sintering temperature was ascertained to be about 1400 °C, which is much lower than for the traditional solid-state reaction method.
AB - Perovskite-type La0.8Ca0.2CrO3 complex oxides were synthesized by a combustion method. Microstructural evolution, electrical properties, and thermal expansion behavior of the ceramics were investigated in the sintering temperature range of 1250 °C to 1450 °C. It was found that the electrical conductivity (σe) remarkably improved with increasing sintering temperature from 1250 C to 1400 C, ascribed to the development of microstructural densification, whereas it declined slightly above 1400 °C due to generation of excessive liquid. The specimen sintered at 1400 °C had a maximum conductivity of 31.6 S cm-1 at 800 °C, and lowest activation energy of 0.148 eV. The improvement of the thermal expansion coefficient (TEC) with increasing sintering temperature was monotonic as a result of the microstructural densification of the materials. The TEC of La0.8Ca0.2CrO3 sintered at 1400°C was about 10.5 × 10-6 K-1, being consistent with other components as high-temperature conductors. With respect to microstructure, electrical properties, and thermal expansion, the preferable sintering temperature was ascertained to be about 1400 °C, which is much lower than for the traditional solid-state reaction method.
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U2 - 10.1007/s11664-012-2464-0
DO - 10.1007/s11664-012-2464-0
M3 - Article
AN - SCOPUS:84877740892
SN - 0361-5235
VL - 42
SP - 939
EP - 943
JO - Journal of Electronic Materials
JF - Journal of Electronic Materials
IS - 6
ER -