Abstract
In order to optimize the growth conditions of stoichiometric lithium niobate from K 2O–Li 2O–Nb 2O 5 fluxes, the limits of its crystallization field were determined by investigating phase equilibria in the ternary system Li 2O–K 2O–Nb 2O 5. For this purpose, suitable parts of four vertical sections were studied using DSC experiments and X-ray powder diffraction allowed to identify all the solid phases involved. The lithium niobate liquidus surface is delimited by four monovariant lines: Liq + Li 3NbO 4 + LiNbO 3, Liq + KNbO 3 + LiNbO 3, Liq + KLN solid solution + LiNbO 3 and Liq + LiNb 3O 8 + LiNbO 3. In the region investigated, three ternary invariant reactions were found. The first < LiNb O 3 > + < KNb O 3 > ⇄ < β -L i 3 Nb O 4 > + < KLN solid solution > is a quasi-peritectoid reaction occurring at 966 °C, the second is the eutectic reaction at 997 °C: Liq ⇄ < β -L i 3 Nb O 4 > + < KNb O 3 > + < LiNb O 3 > and the last one is the quasi-peritectic reaction: Liq + < KLN solid solution > ⇄ < KNb O 3 > + < LiNb O 3 > at about 1050–1055 °C.
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