Popis: |
This article studies the microstructure and piezoelectric properties of a ceramic lead-free NBT under different amount of ZnO doping. X-ray diffraction shows that Zn 2+ diffuses into the lattice of (Bi 0.5 Na 0.5 )TiO 3 to form a solid solution with a pure perovskite structure. By modifying the zinc oxide content, the sintering behavior of (Bi 0.5 Na 0.5 )TiO 3 ceramics was significantly improved and the grain size was increased. The piezoelectric coefficient d 33 for the 1.0 wt.% ZnO-doped (Bi 0.5 Na 0.5 )TiO 3 ceramics sintered at 1050 °C was found to be 95 pC/N, and the electromechanical coupling factor k p = 0.13. However, the piezoelectric coefficient d 33 for the 0.5 wt.% ZnO-doped (Bi 0.5 Na 0.5 )TiO 3 ceramics sintered at 1140 °C was found to be 110 pC/N, and the electromechanical coupling factor k p = 0.17. |