Structural characterization of the complex perovskites Ba1-xLaxTi1-xCrxO3

The series Ba1-xLaxTi1-xCrxO3 (0 less than or equal to x less than or equal to 1) was synthesized at 1400degreesC for about 60 h. Their structure was carefully analyzed by the use of powder X-ray diffraction and Rietveld analysis software GSAS (General Structure Analysis System). Four solid solutions are found in this series: tetragonal solid solution Ba1-xLaxTi1-xCrxO3 (0 less than or equal to x less than or equal to 0.029), cubic solid solution Ba1-xLaxTi1-xCrxO3 (0.0365 less than or equal to x less than or equal to 0.600), rhombohedral solid solution Ba1-xLaxTi1-xCrxO3 (0.700 less than or equal to x less than or equal to 0.873), and orthorhombic solid solution Ba1-xLaxTi1-xCrxO3 (0.956 less than or equal to x less than or equal to 1). There are corresponding two-phase regions between the adjacent two solid solutions. The detailed lattice parameters are presented. The relationship between the lattice parameters and the composition of the solid solutions is developed. (C) 2002 Elsevier Science (USA).