The piezoelectric properties of sodium bismuth tantalate Na 0.5Bi2.5Ta2O9 (NBTa) dense ceramics were determined using 0.1 wt% Mn-doped samples. The ferroelectric properties of the NBTa ceramics were confirmed. The remanent polarization Pr and coercive field Ec were 15.5μC/cm2 and 81.5kV/cm at room temperature, respectively. Optimum poling conditions (temperature T p, time tp and electric field Ep) were μ investigated for piezoelectric measurements. The independent electromechanical coupling factors of the NBTa dense ceramics were obtained as follows: k p = 10.0, k31 = 6.1, k33 = 12.4 and k 15 = 5.6%. These values are comparable to those of the reported bismuth layer-structured ferroelectrics (BLSFs) that are composed of two pseudo-perovskite layers. The physical constants of the NBTa ceramics were also determined. The piezoelectric constants were d33 = 10.8, d 31 = 5.2, and d15 = 6.0pC/N.
|Number of pages||5|
|Journal||Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers|
|Publication status||Published - 1 Oct 2004|
- Bismuth layer-structured compounds
- Material constants