Title :
PKN-a strong piezoelectric crystal
Author :
Sun, Ren-ying ; Fan, Shi-ji ; Wu, Jindi ; Lin, Ya-fang
Author_Institution :
Inst. of Ceramics, Acad. Sinica, Shanghai, China
Abstract :
Dielectric, piezoelectric and electromechanical coupling properties of lead potassium niobate Pb2KNb5O15 (PKN) crystals are reviewed in this paper. PKN has very strong coupling coefficients for bulk wave and surface acoustic wave, k 0.6-0.7 and k2>10% in comparison with several piezoelectric crystals such as LN, LT, α-SiO2, LBO, LGS, LiIO3 and BNN. Transparent, brownish twin-free PKN crystals of 1" diameter by 2" length have been grown by the modified Bridgman method by us for the first time under a furnace temperature 1380-1400°C and growth rate <0.5 mm/hr, so that research into the application of PKN crystals has become possible
Keywords :
acoustic wave velocity; crystal growth from melt; elastic constants; electromechanical effects; lead compounds; permittivity; piezoelectric materials; potassium compounds; surface acoustic waves; 1380 to 1400 degC; PKN; Pb2KNb5O15; bulk wave; coupling coefficients; dielectric properties; electromechanical coupling properties; furnace temperature; growth rate; modified Bridgman method; piezoelectric properties; strong piezoelectric crystal; surface acoustic wave; Acoustic measurements; Acoustic waves; Ceramics; Crystal microstructure; Dielectrics; Ferroelectric materials; Lead; Niobium compounds; Surface acoustic waves; Temperature;
Conference_Titel :
Frequency Control Symposium, 1996. 50th., Proceedings of the 1996 IEEE International.
Conference_Location :
Honolulu, HI
Print_ISBN :
0-7803-3309-8
DOI :
10.1109/FREQ.1996.559828
