Abstract
Lead-free piezoelectric ceramics (1−x) [(0.97Bi0.5Na0.5TiO3)]-0.03BaZrO3-xLiNbO3 (BNT-BZ3-xLN) with x = (0–0.07) were synthesized using the conventional solid-state reaction method, and their crystal structure, microstructure, and dielectric, ferroelectric and piezoelectric properties were investigated as a function of the LN content. The X-ray diffraction patterns revealed the formation of a single-phase perovskite structure for all the LN-modified BNT-BZ ceramics in this study. The results indicate that the LN substitution into BNT-BZ3 induces a transition from a ferroelectric to a diffuse and/or relaxor state accompanying a field-induced strain of 0.20% for x = 0.05 at an applied field of 6 kV/mm. The corresponding dynamic piezoelectric coefficient for this composition was (Smax/Emax = 333 pm/V). A significant reduction of the coercive field (Ec) and enhancement of the piezoelectric constant (d33) from 98 pC/N for x = 0 to 117 pC/N x = 0.01 was observed.
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