Growth and structure of strontium-doped LaGaO3

R. Aleksiyko; Marek Berkowski; J. Fink-Finowicki; P. Byszewski; Ryszard Diduszko; E. Kowalska

doi:10.1117/12.435870

10 August 2001 Growth and structure of strontium-doped LaGaO₃

R. Aleksiyko, Marek Berkowski, J. Fink-Finowicki, P. Byszewski, Ryszard Diduszko, E. Kowalska

Proceedings Volume 4412, International Conference on Solid State Crystals 2000: Growth, Characterization, and Applications of Single Crystals; (2001) https://doi.org/10.1117/12.435870
Event: International Conference on Solid State Crystals 2000, 2000, Zakopane, Poland

Abstract

A series of La_1-xSr_xGaO₃ solid solution single crystal with x equals 0, 0.04 and 0.12 were grown by the Czochralski method and with x equals 0.01, 0.06 and 0.1 by the floating zone method. The segregation coefficient of Sr in LaGaO₃ has been found to be k_eff (Sr) equals 1.25. The crystals were grown from the melt with stoichiometric Ga₂O₃ amount at a growth rate ranging from 2.5 mm/h for pure LaGaO₃ to 1.2 mm/h for La_0.88Sr_0.12GaO₃. The structure of these crystals was investigated by x- ray powder diffraction technique using CuK_(alpha ) radiation. The diffraction patterns were analyzed by Rietveld refinement method. Crystals with strontium concentrations from x equals 0 to 0.1 crystallizes adopting Pbnm structure. It was found that deviation from the ideal perovskite structure decreases with rising strontium concentration, finally reaching centrosymmetric Ibmm structure at x equals 0.12. Orthorombic unit cell parameters c and b decreases whereas a increases with x. Thermal analysis proved that the temperature of the first order phase transition observed in pure LaGaO₃ at 150 degrees falls to 126 degrees at x equals 0.01 and remains almost constant at higher x.

Citation Download Citation

R. Aleksiyko, Marek Berkowski, J. Fink-Finowicki, P. Byszewski, Ryszard Diduszko, and E. Kowalska "Growth and structure of strontium-doped LaGaO₃", Proc. SPIE 4412, International Conference on Solid State Crystals 2000: Growth, Characterization, and Applications of Single Crystals, (10 August 2001); https://doi.org/10.1117/12.435870

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