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In order to synthesize various Perovskite ABO 3 type compounds and their solid solutions, we have applied a novel "melt synthesis technique" rather than conventional solid state reaction techniques. In the melt synthesis, the mixture of oxides or their precursors is melted in a short period of time (1-60 sec) by a strong light radiation in an arc imaging furnace. A spherical molten sample where multiple cations were mixed homogeneously was directly solidified on a copper hearth with a rapid cooling of 10 2 K/sec. Solid solutions based upon 1:1 ordered Perovskite in the system of Sr(Li 2/5 W 3/5 )O 3 -La(Li 3/5 W 2/5 )O 3 were synthesized in this technique.

Lithium tantalate, LiTaO 3 (LT), single crystal growth by the vertical Bridgman (VB) technique is attempt for the first time. In the present VB-LT technique, pure platinum crucibles are used in a furnace with a graphite heater and an argon atmosphere. One-hundred percent solidified crack-free VB-LT crystals are successfully grown by composing the initial melts with exactly congruent compositions. The fundamental technical issues for VB-LT growth are also clarified.

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