Jinhao Qiu1, Junji Tani1,, Kazuyuki Orikasa1,, Kazuya Matsuta1,\footnotemark and Hirofumi Takahashi2
1Institute of Fluid Science, Tohoku University, Sendai 980-8577
This study aims to fabricate high-performance lead-free piezoelectric materials by using a hybrid sintering process, which is a combination of microwave heating and hot-press. The hybrid sintering process was found to be able to improve the density and consequently the piezoelectric properties of PZT and PNN-PZT materials in the former study. The lead-free piezoelectric materials used in this study are BNBT-6[0.94(Bi0.5Na0.5)TiO3-0.06BaTiO3]. The BNBT-6 was sintered with the hybrid process, the conventional process, the microwave process and the hot-press process and the piezoelectric properties of the acquired specimens were investigated and compared. The results showed that the hybrid process increased density of sintered specimens, but could not improve electromechanical coupling factors, kp and kt, and the dielectric constant ε 33T/ε 0, probably due to large grain size and the residual strain generated by the pressure during sintering.
piezoelectric material, hybrid sintering, hot-press, microwave sintering, (Bi0.5Na_0.5)TiO3-BaTiO3, residual strain
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