The effect of (Li,Ce) doping in Aurivillius phase material (Na 0.52 K 0.42 Li 0.06 ) 0.5 Bi 2.5 (Nb 1.88 Sb 0.06 Ta 0.06 )O 9

The effect of (Li,Ce) substitution for A‐site on the properties of [(Na 0.52 K 0.42 Li 0.06 )Bi] 0.5 Bi 2 (Nb 1.88 Sb 0.06 Ta 0.06 )O 9 ‐based ceramics was investigated. The piezoelectric activity of [(Na 0.52 K 0.42 Li 0.06 )Bi] 0.5 Bi 2 (Nb 1.88 Sb 0.06 Ta 0.06 )O 9 ‐based ceramics is significantly improved by the modification of lithium and cerium. The Curie temperature ( T C ) gradually decreases from 625 to 605  o C with increasing the (Li,Ce) modification. The piezoelectric coefficient d 33 of the [(Na 0.52 K 0.42 Li 0.06 )Bi] 0.44 (Li,Ce) 0.03 [] 0.03 Bi 2 (Nb 1.88 Sb 0.06 Ta 0.06 )O 9 ceramic was found to be 28 pC/N, the highest value among the [(Na 0.52 K 0.42 Li 0.06 )Bi] 0.5 Bi 2 (Nb 1.88 Sb 0.06 Ta 0.06 )O 9 ‐based ceramics, also almost 50% higher than the reported d 33 values of other Bismuth layer‐structured 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 T C (∼610 °C) and stable piezoelectric properties, demonstrating that the (Li,Ce) modified [(Na 0.52 K 0.42 Li 0.06 )Bi] 0.5 Bi 2 (Nb 1.88 Sb 0.06 Ta 0.06 )O 9 ‐based material a promising candidate for high temperature applications.