Journal
JOURNAL OF CRYSTAL GROWTH
Volume 284, Issue 1-2, Pages 149-155Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jcrysgro.2005.06.056
Keywords
doping; phase equilibria; top seeded solution growth; niobates; nonlinear optic materials
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MgO-doped near-stoichiometric LiNbO3 crystals have been grown by the high-temperature top-seeded solution growth method from the K2O-Li2O-Nb2O5 flux. The critical threshold concentration of MgO required to minimize photorefractive damage in the crystals has been determined on the basis of the liquid-solid phase relations. The lowest MgO concentration in the melt where above-threshold crystals can be still grown with near-stoichiometric crystal composition was 0.2 mol %. At near-threshold MgO concentration, a transitional region was detected along the crystal growth axis, where two OH- absorption bands peaking at 3465 and 3534cm(-1) frequency were observed in the IR spectra at the same time. (c) 2005 Elsevier B.V. All rights reserved.
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