Electromechanical and ferroelectric properties of (Bi1/2Na1/2)TiO3–(Bi1/2K1/2)TiO3–BaTiO3 lead-free piezoelectric ceramics

Wang, X.X.; Tang, X.G.; Chan, H.L.W.
July 2004
Applied Physics Letters;7/5/2004, Vol. 85 Issue 1, p91
Academic Journal
Lead-free piezoelectric ceramics (0.95-x)(Bi1/2Na1/2)TiO3–x(Bi1/2K1/2)TiO3–0.05BaTiO3 (abbreviated as BNT–BKT–BT100x, with x ranged from 0 to 20 mol %) have been studied. Effects of amount of BKT on the electrical properties and crystal structure were examined. BNT–BKT–BT5 ceramics give good performances with piezoelectric constant d33=148 pC/N, electromechanical coupling factor kp=34 %, kt=49.2 %, free permittivity ε33T/ε0=700, and dissipation factor tanδ=2 % at 1 kHz. Accordingly, the sample shows larger remanent polarization and lower coercive field than 0.95BNT–0.05BT ceramics. X-ray diffraction analysis shows that incorporated BKT diffuses into the BNT–BT 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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