The effect of (Li,Ce) doping in Aurivillius phase material (Na0.52K0.42Li0.06)0.5Bi2.5(Nb1.88Sb0.06Ta0.06)O9

The effect of (Li,Ce) substitution for A‐site on the properties of [(Na0.52K0.42Li0.06)Bi]0.5Bi2 (Nb1.88Sb0.06Ta0.06)O9‐based ceramics was investigated. The piezoelectric activity of [(Na0.52K0.42Li0.06)Bi]0.5Bi2 (Nb1.88Sb0.06Ta0.06)O9‐based ceramics is significantly improved by the modification of lithium and cerium. The Curie temperature (TC) gradually decreases from 625 to 605 oC with increasing the (Li,Ce) modification. The piezoelectric coefficient d33 of the [(Na0.52K0.42Li0.06)Bi]0.44(Li,Ce)0.03[]0.03Bi2(Nb1.88Sb0.06Ta0.06)O9 ceramic was found to be 28 pC/N, the highest value among the [(Na0.52K0.42Li0.06)Bi]0.5Bi2(Nb1.88Sb0.06Ta0.06)O9‐based ceramics, also almost 50% higher than the reported d33 values of other Bismuth layer‐structured ferroelectric (BLSF) systems (∼5–19 pC/N). The planar coupling factor kp and kt were found to be 7.0 and 28.0%, together with the high TC (∼610 °C) and stable piezoelectric properties, demonstrating that the (Li,Ce) modified [(Na0.52K0.42Li0.06)Bi]0.5Bi2(Nb1.88Sb0.06Ta0.06)O9‐based material a promising candidate for high temperature applications.