Abstract
Abstract The dependence of electrical properties of [Ag 0.2 (K 0.52 Na 0.48 ) 0.8 ](Nb 1− x Ta x )O 3 (AKNNT, 0.025≤ x ≤0.1) ceramics on their structural characteristics was investigated. Sintered specimens had a single phase of perovskite structure with orthorhombic symmetry. The unit-cell volume and B-site bond valence ( V B ) of ABO 3 perovskite structure decreased with Ta 5+ content. This decrease induced distortion in the oxygen octahedra. The electromechanical coupling factor ( k p ) and the piezoelectric constant ( d 33 ) of the sintered specimens increased with octahedral distortion. Also, the dielectric constant ( e r ) increased due to the decrease in B-site bond valence ( V B ). Effects of Ta 5+ content on the remanant polarization ( P r ) and coercive field ( E c ) as well as mechanical quality factor ( Q m ) of the sintered specimens were also discussed.
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