Abstract
Lead-free 0.98(Na0.5K0.5)NbO3–0.02Ba(ZrxTi(1−x))O3 (0.98NKN–0.02BZT) ceramics with Zr contents were fabricated by a conventional mixed-oxide method. The results indicate that the Zr/Ti ratio significantly influences the structural, piezoelectric, dielectric, and ferroelectric properties of 0.98NKN–0.02BZT ceramics. For the 0.98NKN–0.02BZT (x=0) ceramics sintered at 1090°C, the bulk density increased as the Zr contents decreased and showed a maximum value at x=0. The Curie temperature of the 0.98NKN–0.02BZT ceramics slightly decreased as the Zr contents increased. The dielectric constant, piezoelectric constant, and electromechanical coupling factor of samples were maximized at x=0, which might be due to the increase in density. A high d33=194pC/N, kp=38% were obtained for the 0.98NKN–0.02BZT ceramics sintered at 1090°C for 4h.
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