Abstract
The structure of mixed La0.92Sr0.08Ga0.92Ti0.08O3 (LSGT-8) single crystal, obtained by Czochralsky method, have been investigated in a wide temperature range of 12-1203 K by means of in situ high resolution powder diffraction technique using synchrotron radiation as well as DTA/DSC analysis. Both, diffraction and calorimetric data indicate a first-order phase transition from orthorhombic (space group Pbnm) to rhombohedral (space group R-3c) structure near the room temperature (Tc ≈ 303 K). Lattice parameters and atomic coordinates of low- and high-temperature phases have been refined in the whole temperature range investigated. It was established that the critical temperature of the phase transition in the system (1-x)LaGaO3-(x)SrTiO3 in the concentration range of x = 0 ÷ 0.08 falls down linearly according to the empirical relation: Tc≈ 419(9) − 15.4(17)*x.
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