Structure and conductivity of perovskites Sr1-xLaxTi1-xCrxO3

The Sr1-xLaxTi1-xCrxO3 (0 less than or equal to x less than or equal to 1) system was synthesized at 1500degreesC 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 less than or equal to x less than or equal to 0.168, space group Pm (3) over barm), rhombohedral solid solution Sr1-xLaxTi1-xCrxO3 (0.23 less than or equal to x less than or equal to 0.67, space group R (3) over barc) and orthorhombic solid solution Sr1-xLaxTi1-xCrxO3 (0.92 less than or equal to x less than or equal to 1, space group Pnma). The conductivities of this series were measured mainly from 25 to 450degreesC. 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 X 10(-3) Omega(-1) cm(-1). (C) 2002 Elsevier Science (USA).