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Effects of meniscus on the directional growth of potassium niobate single crystals |
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| Authors: | H C Zeng T C Chong L C Lim H Kumagai M Hirano |
| Institution: | a Department of Chemical Engineering, Faculty of Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 0511, Singapore b Department of Electrical Engineering, Faculty of Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 0511, Singapore c Department of Mechanical and Production Engineering, Faculty of Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 0511, Singapore d Research Center, Asahi Glass Co., Ltd., Japan 1150 Hazawa-cho, Kanagawa-ku, Yokohama 221, Japan |
| Abstract: | The study of meniscus effects on the directional growth of single crystals of potassium niobate (KNbO3) with a 110]pc oriented seed by the top-seeded-solution-growth technique has been described. The directional growth of KNbO3 single crystals has been illustrated for different crystallographic orientations of the crystal. Experimental results show that the shape of the solution flux meniscus, which is determined by a number of growth parameters, has a significant effect on growth rates on different 100pc, 010pc and 001pc type surfaces. Findings based on this work enable one to select a dominant growth direction and hence to engineer the geometrical shaping of resultant KNbO3 single crystals through careful control of growth parameters. Maximum crystal dimensions for the grown KNbO3 along 100]pc and 001]pc achieved in this work are 34.0 and 31.2 mm, respectively. |
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