Abstract
Lead-free (1−x)Bi0.47Na0.47Ba0.06TiO3–xKNbO3 (BNBT–xKN, x=0–0.08) ceramics were prepared by ordinary ceramic sintering technique. The piezoelectric, dielectric and ferroelectric properties of the ceramics are investigated and discussed. The results of X-ray diffraction (XRD) indicate that KNbO3 (KN) has diffused into Bi0.47Na0.47Ba0.06TiO3 (BNBT) lattices to form a solid solution with a pure perovskite structure. Moderate additive of KN (x≤0.02) in BNBT–xKN ceramics enhance their piezoelectric and ferroelectric properties. Three dielectric anomaly peaks are observed in BNBT–0.00KN, BNBT–0.01KN and BNBT–0.02KN ceramics. With the increment of KN in BNBT–xKN ceramics, the dielectric anomaly peaks shift to lower temperature. BNBT–0.01KN ceramic exhibits excellent piezoelectric properties and strong ferroelectricity: piezoelectric coefficient, d33=195pC/N; electromechanical coupling factor, kt=58.9 and kp=29.3%; mechanical quality factor, Qm=113; remnant polarization, Pr=41.8μC/cm2; coercive field, Ec=19.5kV/cm.
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