Abstract
HTTSSG growth of stoichiometric lithium niobate (sLN) from K2O containing melt was investigated in order to establish optimal condition for facet-free growth of crystals pulled along the Z=〈0001〉 axis. Elimination of pyramidal facets and flow instabilities was achieved by a gradually adjusted rotation rate program at thermal conditions characterized by the relation Gr/Re2>1 assuring a crystallization front conformed to the very low convexity requirement.
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