Large Strain With Ultra-Low Hysteresis and Enhanced Energy Storage Performance of Mn-Doped 0.65Bi0.5Na0.5TiO3-0.35SrTiO3 Lead-Free Ceramics

doi:10.21203/rs.3.rs-184913/v1

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Large Strain With Ultra-Low Hysteresis and Enhanced Energy Storage Performance of Mn-Doped 0.65Bi0.5Na0.5TiO3-0.35SrTiO3 Lead-Free Ceramics

https://doi.org/10.21203/rs.3.rs-184913/v1

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In this paper, the electric-field-induced strain behavior and energy storage performance of MnO-doped 0.65Bi_0.5Na_0.5TiO₃-0.35SrTiO₃ (NBT-ST-xMn) lead-free ceramics has been investigated. After the introduction of MnO into NBT-ST ceramics, pinched and double P-E hysteresis loops with high P_max and negligible P_r can be observed due to the introduction of defect dipoles. As a result, a relatively high strain of 0.22% with ultra-low hysteresis of 14% was achieved under a moderate electric field of 60 kV/cm at x=1.0 mol.%. Excellent energy storage performance of 1.14 and 1.17 J cm^-3 with a high η of 83 and 80% are achieved at x=0.5 and 1.0 mol.%, respectively. Meanwhile, high electrostriction coeffcient of 0.022 m⁴C² with pure electrostrictive characteristics was obtained at x=0.5 mol.%. The results illustrate that the proper selection of base composition and effective chemical modifier can made the NBT-ST an outstanding candidate for actuators and energy storage devices.