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Near-Zero Energy Loss in Sr1-1.5xBixTiO3 Dielectric Ceramics for High-Efficiency Energy Storage
Kaidi Kong1, Qing Sun1, Jiarui Wang2
1School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, China.
Abstract:
High-efficiency Sr1-1.5xBixTiO3 dielectrics with near-zero energy loss were synthesized via the citrate method. Results showed that Bi3+ doping induces local lattice distortion and facilitates the formation of polar nanoregions embedded within the cubic matrix, thereby enhancing the polarization intensity. The optimal composition (x = 0.01) achieves a large recoverable energy density (Wrec) of 3.51 J/cm3 and an ultrahigh efficiency (η) of 97.58% at an electric field of 484 kV/cm, with a high figure of merit (WF = 145) competitive among lead-free dielectric ceramics. First-principles calculations reveal that the enhanced energy storage performance with promoted polarization stems from two synergistic effects: the disruption of the centrosymmetric structure by Bi3+-induced lattice distortion, and the contribution of local polarization from strong hybridization between Bi-6s and O-2p orbitals. These findings offer a promising strategy for designing high-performance lead-free dielectric materials for energy storage applications.
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