Growth and optical properties of LaGaO3/SrTiO3 mixed crystals

Single crystals of La1-xSrxGa1-xTixO3 solid solution with x = 0.01, 0.04 an d 0.08 were grown by the Czochralski method and with x 0.01 by the floating zone method. Large good quality single crystals were grown by the Czochral ski method from a stoichiometric melt at a growth rate at about 2 mm/h up t o x = 0.04. Lattice constants determined by X-ray analysis, being equal to: a = 5.503(1), b = 5.541(1) and c = 7.7829 (1), differ by opposite alh rati o (a/b >1 for pure LaGaO3) from pure LaGaO3. Thermal analysis proved that t he temperature of the first order phase transition observed in pure LaGaO3 at 150 degreesC falls to 76 degreesC at x = 0.04 and remains almost constan t at higher x. The observed fluorescence of T-2(2)-E-2 transition of Ti3+ i n the crystals shows two bands centered at about 420 and 447 nm coming from excitation at 314, 340 and 384 nm absorption bands.