Abstract
Traditional solid state reaction method was adopted to synthesize ternary piezoelectric ceramics 0.55Pb(Ni1/3Nb2/3)O3–0.45Pb(Zr0.3Ti0.7)O3 (abbreviated as PNN–PZT) with MnO2 additive (0−3.5% in molar ratio) in order to develop composition ceramics for low dielectric loss multilayer piezoelectric electroacoustic device. Effect of MnO2 doping on electric properties of PNN–PZT ceramics was systematically investigated. The results show that MnO2 doping significantly reduces dielectric loss (tgδ), increases phase transition temperature (Tmax) at a maximum value of relative permittivity, and weakens ferroelectricity. The 1.0mol% MnO2 doped PNN–PZT ceramics have optimal piezoelectric, dielectric and ferroelectric properties with d33=710 pC/N, kp=0.595, Qm=176, εr=3092 (1kHz), tgδ=0.0149 (1kHz), Pr=15.45 μC/cm2, and Ec=4.98kV/cm. A modified Curie–Weiss law revealed the behavior of diffuse relaxor phase transition of the ceramics. All these results (high d33, high kp, and low tgδ) make the modified PNN–PZT ceramics promising candidates for electromechanical devices. The mechanism of effect of MnO2 doping on electric properties was discussed.
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