Abstract
We have studied conditions for the synthesis of niobium pentoxide and a lithium niobate growth charge doped with dysprosium, which was added to niobium hydroxide obtained through extraction processing of rare-metal-containing raw materials. The phase composition of Nb2O5〈Dy〉 precursors was determined by X-ray diffraction and IR spectroscopy. Using inductively coupled plasma mass spectrometry in combination with a laser ablation sampling system, we examined the Dy dopant profile in Nb2O5 powder samples and the LiNbO3 growth charge. The Nb2O5 precursors and the growth charge synthesized using them were shown to be chemically uniform in composition. The present results are of importance for the growth of defect-free lithium niobate single crystals of optical quality, highly uniform in composition, with a predetermined doping level.
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