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(Bi_0.5Na_0.5)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, k_p and k_t, and the dielectric constant ε₃₃^T/ε₀, probably due to large grain size and the residual strain generated by the pressure during sintering.