Abstract
A series of MgO-doped LiNbO 3 crystals were grown from MgO-doped congruent LiNbO 3 melts. The compositional relationship between the melts and crystals grown from these melts was studied. It was found that as the MgO content increases, the Li 2O and Nb 2O 5 contents as well as the Li/Nb molar ratio in crystals decrease. In general, MgO-doping tends to decrease the effective distribution coefficient of Li 2O and increase that of Nb 2O 5. It can be concluded that from a congruent LiNbO 3 melt doped with 4–6 mol% MgO, as usually adopted, crystals with a high compositional homogeneity cannot be obtained. Problems associated with binary and ternary congruent compositions and the defect structure in MgO-doped LiNbO 3 are also discussed.
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