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

Wenfeng Guo, Yingzi Wang, Adan Li, Tifeng Jiao, Faming Gao

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5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)939-943
Number of pages5
JournalJournal of Electronic Materials
Volume42
Issue number6
DOIs
Publication statusPublished - Jun 2013

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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