Growth of 3-inch diameter near-stoichiometric LiTaO3 by conventional Czochralski technique

Near-stoichiometric LiTaO3 single crystals, 80 mm in diameter and 25–30 mm in length, were grown by conventional Czochralski technique using radio-frequency heating and automatic control system. Two compositions of the starting melt were used, containing accordingly 58 and 60.5 mol% Li2O. The chemical composition of the grown crystals was estimated by measuring their coercive field to be 49.75–49.8 and 49.93–49.97 mol% Li2O for these two starting melts.