Abstract
The (1−x)(Na0.465K0.465Li0.07)NbO3 - xAgTaO3 lead-free ceramics were fabricated by the solid-state reaction process. The densification enhanced with increasing AgTaO3 content, giving maximum relative density of 98% (x = 0.02). Both orthorhombic-tetragonal (T O–T ) and tetragonal-cubic (T C) phase transition temperature decreased gradually with the increasing AgTaO3 content. The ceramic with a composition of x = 0.02 exhibited excellent electrical properties: the dielectric constant (ϵr) = 470, dissipation factor (tan δ) = 0.022, piezoelectric constant d 33 = 160 pC/N, and Curie temperature T C = 432°C. These results clearly showed that the 0.98(Na0.465K0.465Li0.07)NbO3 – 0.02AgTaO3 ceramics are very promising lead-free piezoelectric candidates.
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