The effect of (Li,Ce) doping in Aurivillius phase material (Na _0.52K _0.42Li _0.06) _0.5Bi _2.5(Nb _1.88Sb _0.06Ta _0.06)O ₉

The effect of (Li,Ce) substitution for A-site on the properties of [(Na _0.52K _0.42Li _0.06)Bi] _0.5Bi ₂ (Nb _1.88Sb _0.06Ta _0.06)O ₉-based ceramics was investigated. The piezoelectric activity of [(Na _0.52K _0.42Li _0.06)Bi] _0.5Bi ₂ (Nb _1.88Sb _0.06Ta _0.06)O ₉-based ceramics is significantly improved by the modification of lithium and cerium. The Curie temperature (TC) gradually decreases from 625 to 605 °C with increasing the (Li,Ce) modification. The piezoelectric coefficient d ₃₃ of the [(Na _0.52K _0.42Li _0.06)Bi] _0.44(Li,-Ce) _0.03[] _0.03Bi ₂(Nb _1.88Sb _0.06Ta _0.06)O ₉ ceramic was found to be 28 pC/N, the highest value among the [(Na _0.52K _0.42Li _0.06)-Bi] _0.5Bi ₂(Nb _1.88Sb _0.06Ta _0.06)O ₉-based ceramics, also almost 50% higher than the reported d ₃₃ values of other Bismuth layerstructured ferroelectric (BLSF) systems (∼5-19 pC/N). The planar coupling factor k _p and k _t were found to be 7.0 and 28.0%, together with the high TC (∼610 8C) and stable piezoelectric properties, demonstrating that the (Li,Ce) modified [(Na _0.52K _0.42 Li _0.06)Bi] _0.5Bi ₂(Nb _1.88Sb _0.06Ta _0.06)O ₉-based material a promising candidate for high temperature applications.