In this study, in order to develop composition ceramics for Acoustic Emission (abbreviated as AE) sensor application, the PZT system ceramics was fabricated by conventional solid state reaction method. When x=0.48, the density, electromechanical coupling factor(kp), piezoelectric coefficient d₃₃ and piezoelectric voltage constant g₃₃ of the maximum values of 7.857 g/cm₃, 0.51, 190[pC/N], 52[10-₃mV/N] were obtained, respectively, suitable for AE sensor.

In this paper, in order to develop optimum composition ceramics with excellent piezoelectric properties, (Na0.525K0.443Li0.037)(Nb0.823Sb0.08Ta0.037)O3 + 0.3 wt%Bi2O3 + 0.4 wt%Fe2O3 lead-free piezoelectric ceramics were synthesized by conventional soild-state method. The calcination temperature of columbite precursors were fabricated at temperature range from 950℃ to 1,150℃ and sintering aids with low melting point were added to densify these ceramics. Effect of calcination temperature on dielectric and piezoelectric properties of ceramics were investigated. the ceramics with B-site columbite precursors at temperature of 1,100℃ obtained the optimal values of d33=272 [pC/N], kp=0.51, Qm=102, εr=978.