Structural characterization of the perovskite series La1-xSrxCr1-xTixO3

The perovskite-type compounds La1-xSrxCr1-xTixO3, x = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, have been synthesized by alkoxide methods, and the room temperature structures characterized using X-ray synchrotron powder diffraction. The x = 0 endmember, LaCrO3, and the x = 0.1 compound are orthorhombic in space group Pbnm, the compounds with x = 0.2 to x = 0.7 inclusive are rhombohedral in R (3) over barc, and the x = 0.8 and x = 0.9 compounds are, like the x = 1 endmember SrTiO3, cubic in Pm (3) over barm. This sequence differs from that reported recently in this journal (R. H. Mitchell and A. R. Chakhmouradian, J. Solid State Chem. 144, 81-85, 1999), but is as expected by comparison with the high-temperature behavior of the end member LaCrO3. (C) 2000 Academic Press.