Electrical and Optical Properties of Potassium Niobate Grown by Vertical Bridgman Method
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.
Masaru Miyayama, Tadashi Takenaka, Masasuke Takata and Kazuo Shinozaki
T. Takagi et al., "Electrical and Optical Properties of Potassium Niobate Grown by Vertical Bridgman Method", Key Engineering Materials, Vol. 301, pp. 15-18, 2006