| Summary: | In this paper, in order to develop composition ceramics for an acoustic emission sensor application for nondestructive testing, Pb(Ni,Nb<sub>2/3</sub>)O<sub>3</sub>-Pb(Zr,Ti)O<sub>3</sub>-Pb(Mg,W)O<sub>3</sub> [PNN-PZT-PMW] system ceramics were manufactured by conventional mixed oxide method using Li<sub>2</sub>CO<sub>3</sub> and CaCO<sub>3</sub> as sintering aids. Their microstructural, dielectric and piezoelectric properties were also investigated. At x = 0.0075 Sm, the substituted specimen sintered at 980 (°C), and high values of piezoelectric properties appeared: the dielectric constant (ε<sub>r</sub>) of 2824, piezoelectric coefficient d<sub>33</sub> of 630 [pC/N], planar electromechanical coupling factor k<sub>p</sub> of 0.665, piezoelectric voltage constant g<sub>33</sub> of 25.2 [mV.m/N], and high Curie temperature (Tc) = 270 (°C), respectively. These values were applicable for devices such as acoustic emission sensor and ultrasonic transducer.
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