Abstract
A Pb(Ni1/3Nb2/3)0.5(Ti0.7Zr0.3)0.5O3 functionally graded piezoelectric actuator was fabricated by tape-casting. The properties of the PNN-PZT ceramics were initially investigated by phase and microstructure analyses. High piezoelectric, dielectric and ferroelectric properties of d33 = 780 pC/N, kp = 0.605, εr = 6.18 × 103, tanδ = 0.018, Pr = 26.36 μC/cm2 were obtained for the specimens sintered at 1225 °C. The new piezoelectric actuator consisted of four layers, and the variation of changes in their d33 and εr were graded opposite the thickness direction. The relationship between displacement and voltage for the actuator was determined, with the results showing that it was linear. The driving displacement of the actuator reached 416.550 μm.
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