Abstract
Lead-free piezoelectric ceramics (1-x)(Na0.5K0.5)NbO3-xBi0.5(Na0.8K0.2)0.5TiO3 (abbreviated as NKN-BNKT100x, with x ranges from 0 to 0.08 mol) have been synthesized by a conventional solid state sintering method. The effects of amount of BNKT-content on electrical properties and crystalline structures have been investigated. X-ray diffraction analysis showed that a morphotropic phase boundaries (MPB) between orthorhombic and tetragonal phases exists in the composition range of 0.05 < x < 0.06, near which the dielectric and piezoelectric properties are enhanced. The NKN-BNKT5 ceramics exhibits good properties (d33 = 216pC/N, kp = 41%, e33T/e0 = 1315). These results indicate that NKN-BNKT100x ceramic is a promising lead-free piezoelectric candidate material.
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