(1-x)KNNT-xBNZ lead-free piezoelectric ceramics were prepared by solid state reaction method. The effect of composition and sintering temperature on the phase,microstructure and electric-properties were studied.The results show that the calcination temperature of 850 ℃ is determined by thermal analysis.By XRD detecting,the calcinated powder are typical perovskite structures,and the crystal structure is the coexistence of tetragonal phase and orthorhombic phase.By SEM,the good sintering ceramics with a uniform grain are ob-tained for the ceramic when x=0.04 and sintering temperature is 1120 ℃.The electric-properties test shows that the ceramics with excellent electric properties of ε r=1250,d33=235 pC/N,kp=0.43 are obtained at sinte-ring temperature of 1120 ℃.When x=0.04,the resonance frequency fr is 210.032 kHz,which is lower than that of other components.
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