Dielectric and Piezoelectric Properties of (Bi0.5Na0.5)TiO3 (Bi0.5K0.5)TiO3 Systems
Abstract
The structural, dielectric and piezoelectric properties of[Bi0.5(Na1-XKX)0.5]TiO3 ceramics were studied for the compositional range, X=0 1.0. The samples were prepared by a conventional sintering technique. From X-ray diffraction results, it was found that the morphotropic phase boundary (MPB) between (Bi0.5Na0.5)TiO3 (rhombohedral) and (Bi0.5K0.5)TiO3 (tetragonal) exists in the range of X=0.16 0.20. Polarization-Electric field hysteresis loops show that the remanent polarization at X=0.20 (BNTK20) is larger than that at X=0.0 (BNT). Peaks of electromechanical coupling factor, dielectric constant, piezoelectric constant and elastic compliance were obtained at X=0.16 0.20 of the MPB region. Dielectric and piezoelectric properties are enhanced in the MPB region for [Bi0.5(Na1-XKX)0.5]TiO3, similar to that observed for Pb(Zr, Ti)O3.
- Publication:
-
Japanese Journal of Applied Physics
- Pub Date:
- September 1999
- DOI:
- 10.1143/JJAP.38.5564
- Bibcode:
- 1999JaJAP..38.5564S