Single crystals of optically good quality KTa
xNb
(1-x)O
3(KTN), 10mm×10mm×15mm in size, are prepared by a modified Kyropoulos technique from melts which contain excess of K
2CO
3. The as-grown crystals possess well-developed (100) surfaces. When K
2CO
3 content is chosen to be 52_??_55 mol %, colorless and transparent crystals are grown and their resistivity ρ is as high as 10
13Ω·cm. However, with increasing K
2CO
3 contents over 60 mole %, values of ρ decrease to 10
8Ω·cm and crystals become blue in color. Dielectric constant at Curie temperature
Tc and Curie-Weiss constant are independent of K
2CO
3 content. Half-wave voltage Vπ are measured for several samples at temperatures about 10°C above the
Tc. The value of Vπ, is about 300 V, which remains constant with K
2CO
3 content.
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