ABSTRACT
By the ordinary CZ method, the melt composition must ideally the same as that of the grown crystal, otherwise the melt composition changes during the progress of crystallization and as a result, it causes a compositional non-uniformity in the grown crystal. In the psudo-binary system of Li20-Nb205, near-stoichiometric LiNb03 coexists in equilibrium with a Li-rich melt (about 58 Li20 mol%), which is close to an eutectic composition as shown in Fig. 1 [5]. Large single crystal with high homogeneity cannot be grown by the CZ method from the melt of such a composition close to the eutectic composition and much off from the congruent composition.
