Effect of Sintering Temperature on Microstructure, Electrical Properties, and Thermal Expansion of Perovskite-Type La0.8Ca0.2CrO3 Complex Oxides Synthesized by a

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• 作者：Wenfeng Guo (1) (2)
  Yingzi Wang (3)
  Adan Li (1)
  Tifeng Jiao (1)
  Faming Gao (1)
  
• 关键词：La0.8Ca0.2CrO3 ; microstructure ; electrical conductivity ; activation energy ; thermal expansion coefficient (TEC)
• 刊名：Journal of Electronic Materials
• 出版年：2013
• 出版时间：June 2013
• 年：2013
• 卷：42
• 期：6
• 页码：939-943
• 全文大小：506KB
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• 作者单位：Wenfeng Guo (1) (2)
  Yingzi Wang (3)
  Adan Li (1)
  Tifeng Jiao (1)
  Faming Gao (1)
  
  1. Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, 066004, China
  2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China
  3. School of Material Science and Engineering, University of Jinan, Jinan, 250022, China
  
• ISSN：1543-186X

文摘

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 (σ e) 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? 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??K?, 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.