Crystal Research and Technology
Cryst. Res. Technol. 36 (2001) 865 - Abstract -

S. M. Kaczmarek, R. Aleksiyko*, M. Berkowski*, J. Fink-Finowicki*, M. Czuba, W. Olesinska**

Institute of Optoelectronics, Military University of Technology, Warsaw, Poland
*Institute of Physics Polish Academy of Sciences, Warsaw, Poland
**Institute of Electronic Materials Technology, Warsaw, Poland

Growth and Optical Properties of LaGaO3/SrTiO3 Mixed Crystals

Single crystals of La1-xSrxGa1-xTixO3 solid solution with x = 0.01, 0.04 and 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 Czochralski method from a stoichiometric melt at a growth rate at about 2 mm/h up to 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 a/b ratio (a/b>1 for pure LaGaO3) from pure LaGaO3. Thermal analysis proved that the temperature of the first order phase transition observed in pure LaGaO3 at 150 °C falls to 76 °C at x = 0.04 and remains almost constant at higher x. The observed fluorescence of 2T2-2E transition of Ti3+ in the crystals shows two bands centered at about 420 and 447 nm coming from excitation at 314, 340 and 384 nm absorption bands.

Keywords: crystal growth, LaGaO3/SrTiO3 mixed crystals, phase transition, absorption, photoluminescence


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