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Lead-free (1-x)NKN-xBZT ceramics were fabricated by a conventional mixed oxide method. The results indicate that the content of BZT significantly influences the sintering, microstructure and electrical properties of (1-x)NKN-xBZT ceramics. For the (1-x)NKN-xBZT ceramics sintered at 1100°C, the bulk density increased with increasing content of BZT until reaching a maximum value at a content of 0.3BZT. The dielectric constant, piezoelectric constant and electromechanical coupling factor of the (1-x)NKN-xBZT ceramics increased with adding BZT content at a low BZT content, in spite of the deformation of the NKN lattice, which might be due to the increase in their density. The optimum properties d33 = 155 pC/N, kp = 36%, ε = 393 and Pr = 9.8 µC/cm 2 were obtained for the 0.97NKN-0.03BZT ceramics sintered at 1100°C for 4 h.

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