Achieving large piezoelectric response and ultrahigh electrostriction in [001] textured BiScO 3 ‐PbTiO 3 high‐temperature piezoelectric ceramics

Abstract [001] textured 0.40BiScO 3 ‐0.60PbTiO 3 ‐0.125 mol%Nb 5+ (BS‐60PT‐0.125Nb) high‐temperature piezoelectric ceramics were synthesized using templated grain growth process. A high texture degree F 001 of 99% was obtained using 2 vol% BaTiO 3 (BT) templates. The piezoelectric charge constant d 33 and the unipolar strain under 40 kV cm −1 at room temperature for the textured ceramics are 646 pC N −1 and 0.36%, respectively, which is over two times as those for untextured ceramics (∼243 pC N −1 and 0.17%). The electrostriction Q 33 value of the textured sample remarkably increased from 0.034 m 4 C −2 to 0.068 m 4 C −2 under 30 kV cm −1 , showing a twice higher than untextured. Compared with random ceramics, the improvement piezoelectric response of the textured ceramics is primarily attributed to the increase of the dielectric constant ε r and electrostriction coefficient Q 33 along [001] orientation, which is originating from the anisotropy of piezoelectricity. The BS‐60PT‐0.125Nb textured ceramics have large piezoelectric response and ultrahigh electrostriction with high temperature stability (high depolarization temperature T d of ∼360°C and high Curie temperature T c of 421°C), showing great potential for the piezoelectric applications at high temperatures.