Bismuth sodium titanate (Bi0.5Na0.5TiO3, BNT) with 0-6 at. % lanthanum was prepared by the conventional mixed oxide method. Each composition was calcined at 800-900°C for 2-5 h to form a pure perovskite phase. Green pellets were sintered at 1050-1150°C for 1-4 h to obtain dense ceramics with at least 95% of theoretical density. X-ray diffraction (XRD) showed phase distortion as lanthanum was added to this system. Meanwhile, a small amount of La was found to affect the grain size and had an influence on the poling conditions and electrical properties. The BNT-based composition with 1 at.% La doping provided a dielectric constant (K) of 560, a piezoelectric charge constant (d33) of 92 pC/N, and a hydrostatic piezoelectric coefficient (dh) of 72 pC/N.
|Original language||English (US)|
|Number of pages||5|
|Journal||Journal of the American Ceramic Society|
|State||Published - Jan 1 1997|
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry