Piezoelectric properties of Bi3TiNbO9-BaBi2Nb2O9 ceramics

Piezoelectric properties of lead-free bismuth layer structure oxides, (1 - x)Bi3TiNbO9 (BTN)-xBaBi(2)Nb(2)O(9) (BBN) (m = 2) ceramics, have been studied. We have observed large piezoelectric properties for x values between 0.1 and 0.3. Within this range of x values, these specimens have an orthorhombic structure, high anisotropy of the a and b axes and high resistivity. Also, for these samples, a large coercive force (E-c) of 8.0 kV/mm large remanent polarization (P-r) of 7.1 muC/cm(2) at 200 degreesC and high Curie temperatures (T-c) of 700-900 degreesC have been obtained. Maximum mechanical quality factor (Q(m)) of 9000 at 16 MHz thickness extensional third vibration mode (TE3rd) has been measured.