| Summary: | In this paper, for the application to multi-layer piezoelectric devices capable of being used in piezoelectric speakers, Pb(Ni<sub>1/3</sub>Nb<sub>2/3</sub>)O<sub>3</sub>-Pb(Zr,Ti)O<sub>3</sub>-BiFeO<sub>3</sub> ceramics substituted with Pb(Mg<sub>1/2</sub>W<sub>1/2</sub>)O<sub>3</sub> were manufactured according to MnO<sub>2</sub> addition, and their physical properties were studied. At non-doped MnO<sub>2</sub> added specimen, the maximum values of piezoelectric properties were shown, respectively: the ε<sub>r</sub> of 2182, d<sub>33</sub> of 513 pC/N, and k<sub>p</sub> of 0.634. When taking into consideration the low dielectric constant and high d<sub>33</sub> in case of increasing the numbers of multilayer in ceramics, the x = 0.2 composition ceramics was suitable for the device application such as speaker using low-temperature sintering multilayer piezoelectric actuators.
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