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In this article, to develop the composition ceramics for the application of single-layer piezoelectric speaker, Pb(Ni 1/3 Nb 2/3 ) 0.5 (Zr 0.32 Ti 0.68 ) 0.5 O 3  co-doped with Ta 2 O 5  and Sm 2 O 3  were manufactured and then their dielectric and piezoelectric properties were investigated. At the 0.4 wt% Ta 2 O 5  and 0.0 wt% Sm 2 O 3  added composition ceramics, excellent physical properties were also appeared, respectively: the dielectric constant ( εr ) of 6778, piezoelectric charge constant (d 33 ) of 1027 [pC/N], electromechanical coefficient ( kp ) of 0.67 and curie temperature of 155 [°C]. These values were suitable for the device application such as ultrasonic tooth cleaner and piezoelectric speakers.

Physical properties of Sm 2 O 3 added Pb(Ni 1/3 Nb 2/3 ) O 3 –Pb(Zr 0.32 Ti 0.68 )O 3 system ceramics for piezoelectric speaker application