Bi3-xMxTiTaO9 (M = La or Nd) ceramics with high mechanical quality factor Qm

The piezoelectric, ferroelectric and dielectric properties of Nd-modified Bi3TiTaO9 (Bi3-xNdxTiTaO9, BNTT-x) (0 < x < 0.75) and La-modified Bi3TiTaO9 (Bi3-xLaxTiTaO9, BLTT-x) (0 < x < 1.00) ceramics were investigated and compared. The specimens were fabricated by a conventional ceramic fabrication technique. BNTT-0.50 and BLTT-0.25 ceramics showed the highest coercive field, E-c of approximately 150 kV/cm in the BNTT and BLTT systems, respectively. Furthermore, BNTT-0.50 and BLTT-0.25 ceramics also showed the highest mechanical quality factor, Q(m), of approximately 11000 in the BNTT and BLTT systems at the (33)-mode, respectively. On the basis of result of this study, it was found that both BNTT-0.50 and BLTT-0.25 are high-Q(m) material.