Structure and Conductivity of Perovskites Sr1−xLaxTi1−xCrxO3

Abstract

The Sr1−xLaxTi1−xCrxO3 (0≤x≤1) system was synthesized at 1500°C for about 60 h. Their structures were analyzed by the use of powder X-ray diffraction data and Rietveld analysis software GSAS (General Structure Analysis System). Three solid solutions are found: cubic solid solution Sr1−xLaxTi1−xCrxO3 (0≤x≤0.168, space group Pm3m), rhombohedral solid solution Sr1−xLaxTi1−xCrxO3 (0.23≤x≤0.67, space group R3c) and orthorhombic solid solution Sr1−xLaxTi1−xCrxO3 (0.92≤ x≤1, space group Pnma). The conductivities of this series were measured mainly from 25 to 450°C. It was found that this series changed from dielectric material SrTiO3 to semiconductor LaCrO3 continuously. The highest conductive sample was found to be Sr1−xLaxTi1−xCrxO3 with x=0.92, whose conductivity at room temperature was about 5×10−3Ω−1cm−1.