Lead-free piezoelectric ceramics (0.95x)(Bi12Na12)TiO3x(Bi12K12)TiO30.05BaTiO3 (abbreviated as BNTBKTBT100x, with x ranged from 0 to 20mol%) have been studied. Effects of amount of BKT on the electrical properties and crystal structure were examined. BNTBKTBT5 ceramics give good performances with piezoelectric constant d33=148pCN, electromechanical coupling factor kp=34%, kt=49.2%, free permittivity ε33Tε0=700, and dissipation factor tanδ=2% at 1kHz. Accordingly, the sample shows larger remanent polarization and lower coercive field than 0.95BNT0.05BT ceramics. X-ray diffraction analysis shows that incorporated BKT diffuses into the BNTBT lattice to form a solid solution during sintering, but changes the crystal structure from rhombohedral to tetragonal symmetry at higher BKT amounts.

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