Electrical and Optical Properties of Potassium Niobate Grown by Vertical Bridgman Method |
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| Journal | Key Engineering Materials (Volume 301) |
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| Volume | Electroceramics in Japan VIII |
| Edited by | Masaru Miyayama, Tadashi Takenaka, Masasuke Takata and Kazuo Shinozaki |
| Pages | 15-18 |
| DOI | 10.4028/www.scientific.net/KEM.301.15 |
| Citation | Takashi Takagi et al., 2006, Key Engineering Materials, 301, 15 |
| Online since | January, 2006 |
| Authors | Takashi Takagi, Takashi Fujii, Akira Ando, Yukio Sakabe |
| Keywords | Bridgman Technique, Ferroelectric Materials, Potassium Niobate |
| Abstract | Piezoelectric properties of potassium niobate (KNbO3; KN) crystal grown using the Vertical Bridgman method were obtained by a resonance-antiresonance method for a length extensional mode. The crystal was poled at 200°C under an electric field of 70 V/mm applied parallel to one of the spontaneous polarization axes. An electromechanical coupling factor (k31) of 0.248, mechanical quality factor (Qm) of 5700, piezoelectric constant (d31) of 9.6 pC/N, elastic compliance (s11E) of 4.02 pm2/ N, and constant (e33T/e0) of 42 were obtained. The optical absorption coefficient of poled crystal has been less than 1.0 cm-1 in the wavelength region of 400-1600 nm. Comparing these values with the reported one for TSSG-KN, indicated that our VB-KN was of good quality. |
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