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Lead‐free Ba0.7Ca0.3Ti1−xSnxO3 (x=0.00, 0.025, 0.050, 0.075, and 0.1, abbreviated as BCST) electroceramic system was prepared by the solid‐state reaction method and its ferroelectric, piezoelectric, and electrostrictive properties were investigated. X‐ray diffraction shows that the compositions with x≤0.05 exhibit a tetragonal crystal structure having P4mm symmetry; while the compositions x=0.075 and 0.1 exhibit a mixed P4mm+Amm2 phase coexistence of tetragonal and orthorhombic and P4mm+Pmtrue3false¯m pseudo‐cubic lattice symmetries, respectively, at room temperature. The dense microstructure having relative density ~90%‐92% and average grain size in the range ~2.36 μm to 8.56 μm was observed for BCST ceramics. Temperature‐dependent dielectric measurements support the presence of phase coexistence and show the decrease in Curie temperature (TC) with Sn4+ substitution. The dielectric loss (tan δ) values in the temperature range (−100°C to 150°C) was observed to be <4%, for all BCST ceramics. The BCST compositions exhibit typical polarization‐electric field (P‐E) hysteresis and electric field induced strain (S‐E) butterfly loop, which confirms the ferroelectric and piezoelectric character. The compositions x=0.025, 0.05 and 0.075 show the peaking behavior of displacement current density (trueJ→) to an applied electric field (trueE→) (J‐E) which implies the saturation state of polarization. The maximum electrostrictive coefficient (Q33) value of 0.0667 m4/C2 was observed for x=0.075 and it is higher than some of the significant lead‐based electrostrictive materials. The compositions x=0.05 and 0.075 exhibit the notable electrostrictive properties that may be useful for piezoelectric Ac device applications. The observed results are discussed and correlated with the structure‐property‐composition.

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Declarations FundingNo funding was received. IMPROVED TUNABILITY AND ENERGY STORAGE DENSITY PROPERTIES OF LOW LOSS, LEAD FREE (Ba 0.50 Sr 0.50 )TiO 3 and Ba(Zr 0.15 Ti 0.85 )O 3 BILAYER THIN FILM STACKS