Phase equilibrium relations in the system PbO-TiOz-ZrOz were studied by quenching in the range where the PbO content is 50 mole yo and more. Isotherms were examined at llOOo, 1200°, and 13OO0C and tie lines were determined between the liquid and solid solution in equilibrium. The incongruent melting point of PbZr03 was 157OOC and the equilibrium between liquid, PbO-type solid, and PbZrOa is peritectic. Pb(Zr,Ti)Ol solid solutions containing more than 14 mole yo PbZrOa decomposed to liquid, ZrOz, and Pb(Zr,Ti)Oa and the decomposition temperature rises from 1340° to 157OOC with increasing PbZrO, content. The system PbTi03-PbZr03 should not b e treated as a binary, but as a section of the ternary system.

The phase equilibrium of the LiVO3-LiNbO3 pseudobinary system has been investigated, and a LiNbO3 single-crystal thin film has been grown epitaxially onto the substrate by dipping a c-plate LiTaO3 substrate into a LiVO3 flux solution. An x-ray rocking curve indicated that the film had a high single crystallinity with good epitaxy. The composition ratio Li/Nb of the film was estimated to be close to the stoichiometric value Li/Nb≈1.0.

We report optical waveguiding of a LiNbO3 single−crystal film grown onto a c−plate LiTaO3 substrate by liquid phase epitaxy from a new Li2O−V2O5 flux. A film of about 3−μm thickness supported seven TE and two TM modes. Measurements of the mode indices indicated that the film is a ’’uniform’’ waveguide having constant refractive indices no=2.2884 and ne=2.1914 throughout the film. Attenuation was measured to be 5 and 11 dB/cm for TM and TE, respectively.

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