Lead‐free (Ba1−xCax)(Ti0.95Zr0.05)O3 (x=0.02–0.20) ceramics were prepared successfully using a solid‐state reaction technique. The polymorphic phase transitions from orthorhombic to tetragonal phase around room temperature were identified in the composition range of 0.06

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Lead-free (Ba 1Àx Ca x )(Ti 0.96 Sn 0.04 )O 3 (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 0.01x 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.

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