Pb(Znl/~Nb,/3)03 (PZN) ceramic is used to improve the piezoelectric properties of PZT ceramics. Complete perovskite phase is synthesized for PZN content up to 10 mol%. Piezoceramics having dielectric constant higher than 3000 and planar couplin factor about 60% are the thickness of ceramic plate. Plate with thickness smaller than l o o p shows nothing in superior piezoelectric properties. The second phase ZrO2 due to the evaporation of PbO phase during sinterin is the dominant factor. gradually plays an important role when thickness is thin enough. Experimental results demonstrate both the control of PbO vapor pressure and the processing conditions can effectively reduce such deterioration.obtainable. However, these properties seem to be 9 eteriorated by decreasing This non-piezoelectric phase exists on the surface o P piezoceramic plate and

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