Large Piezoelectric Coefficient in (Ba1−xCax)(Ti0.96Sn0.04)O3
(BCST) (x = 0–0.04) ceramics were prepared using solid‐state reaction technique. At room temperature, a polymorphic phase transition from orthorhombic phase to tetragonal phase was identified in the composition range of 0.01 ≤ x ≤ 0.03.
Extremely high piezoelectric coefficient of d
33 = 510 pC/N and high planar electromechanical coupling factor of k
p = 48% were obtained for the BCST ceramics at x = 0.02. These results
indicate that the BCSTs are promising candidates for the widely used lead‐based piezoelectric materials.