Abstract
(Na 0.5K 0.5) 0.975Li 0.025Nb 0.82− x Sb x Ta 0.18O 3 lead-free piezoceramics were prepared by the conventional solid-state sintering method. All samples possess a pure perovskite phase, and no secondary phase could be certified. The crystal structure changes from tetragonal to pseudo-cubic with increasing amount of Sb. The ferroelectric Curie temperature ( T c) shifts to lower temperature while the tetragonal to orthorhombic phase transition temperature ( T o –t ) shows no obvious change with increasing Sb 5+. Enhanced piezoelectric and electromechanical properties are obtained with x=0.06: d 33=352 pC/N, k p=47% and k t=38%, showing that they could be promising candidates as lead-free piezoelectric materials.
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