fig4

Figure 4. Energy-storage performance of BNT-BT-0.1BS ceramics. (A) Unipolar P-E loops under different electric fields, and (B) corresponding W_rec and η; (C) Variation of W_D with time under different electric fields; (D) Comparison of W_rec and η with reported Pb-free bulk ceramics; (E) Comparison of P_D and W_D with reported Pb-free bulk ceramics; (F) W_D and P_D under different electric fields. BNT: Bi_0.5Na_0.5TiO₃; BT: BaTiO₃; BS: BaSnO₃; BKT: Bi_0.5K_0.5TiO₃; ST: SrTiO₃; KNN: K_0.5Na_0.5NbO₃; NN: NaNbO₃; AN: AgNbO₃; BF: BiFeO₃.