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Growth and Optical Properties of LaGaO 3 /SrTiO 3 MixedCrystals
Author(s) -
Kaczmarek S. M.,
Aleksiyko R.,
Berkowski M.,
FinkFinowicki J.,
Czuba M.,
Olesinska W.
Publication year - 2001
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/1521-4079(200110)36:8/10<865::aid-crat865>3.0.co;2-3
Subject(s) - chemistry , materials science
Single crystals of La 1‐x Sr x Ga 1‐x Ti x O 3 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 LaGaO 3 ) from pure LaGaO 3 . Thermal analysis proved that the temperature of the first order phase transition observed in pure LaGaO 3 at 150 °C falls to 76 °C at x = 0.04 and remains almost constant at higher x . The observed fluorescence of 2 T 2 ‐ 2 E transition of Ti 3+ in the crystals shows two bands centered at about 420 and 447 nm coming from excitation at 314, 340 and 384 nm absorption bands.