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 process ing of rare metal containing raw materials. The phase composition of Nb 2 O 5 〈Dy〉 precursors was determined by X ray diffraction and IR spectroscopy. Using inductively coupled plasma mass spectrometry in combina tion with a laser ablation sampling system, we examined the Dy dopant profile in Nb 2 O 5 powder samples and the LiNbO 3 growth charge. The Nb 2 O 5 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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