Abstract
Potassium niobate (KNbO 3 ) single crystals were grown by a top-seeded solution growth (TSSG) method. At first, the electric field was applied along [001]c (cubic notification system) direction of KNbO 3 crystals to induce the engineered domain configurations into KNbO 3 crystals. Prior to domain engineering, the piezoelectric properties of [001]c oriented KNbO 3 single-domain crystals were measured. These measurement values were completely consisted with the calculated d 31 and d 32 . Finally, the fine engineered domain configurations were induced into KNbO 3 crystals. As a result, piezoelectric properties increased with decreasing domain sizes of the engineered domain configuration. However, the symmetry of the KNbO 3 crystals was, and there were four kinds of domain structures such as 90°, 180°, 60° and 120° domains. Thus, the engineered domain structure induced in this study was very complicated structure, and the piezoelectric properties were also depended on domain pattern and kinds of domain walls.
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