Piezoelectric Properties of Bi3TiNbO9–BaBi2Nb2O9 Ceramics

Piezoelectric properties of lead-free bismuth layer structure oxides, (1-x)Bi3TiNbO9 (BTN)–xBaBi2Nb2O9 (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 µC/cm2 at 200°C and high Curie temperatures (T c) of 700–900°C have been obtained. Maximum mechanical quality factor (Q m) of 9000 at 16 MHz thickness extensional third vibration mode (TE3rd) has been measured.