Synthesis and Piezoelectric Properties of Lead-free （ Bi0.5 Na0.5 ）1-x（BaaSrb）xTiO3 Ceramics
摘要
A new group of lead-free piezoelectric ceramics, ( Bi0.5 Na0.5 ) 1 - x ( BaaSrb ) x TiO3 ( abbreviated as BNBST[ 100x - 100a/100b ] ,0 ＜ x ＜ 1, a + b = 1 ), was synthesized. The ceramics were prepared by conventional ceramic sintering technique, and the ceramics with density of 95% of the theoretical one can be sintered without the atmasphere control during the sintering process. The results of the X- ray diffraction ( XRD ) data show that the ceramics possess a single perovskite phase. The measurements of dielectric and piezoelectric properties reveal that the ceramics provide relatively high piezoelectric charge constant d33 and high planar electromechanical coupling factor kp . For the BNBST6-95/5 ceramics, d33 is equal to 170pC/N, and kp is equal to 32.0% . The fabrication technique for these ceramics is conventional and stable.