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Figure 8. Ferroelectric properties, polarization response, and microstructure during the heating process of BNST-0.03FN ceramic. (A) P-E loops and (B) S-E curves of BNST-0.03FN ceramic at different temperatures. (C) Variation of P_max, P_r, S_max and S_neg as a function of temperature. (D) J-E curves of BNST-0.03FN ceramic at different temperatures. (E) Two-dimensional evolution of the J-E curves with temperature in the first and second quadrants. (F) XRD pattern showing the evolution of the (111) peak and (200) peak with temperature of BNST-0.03FN ceramic. (G) Raman spectra and the fitting results of thirteen Gaussian-Lorentzian peaks for BNST-0.03FN ceramic at different temperatures. (H) Variation of Gaussian-Lorentzian peak positions in regions I-III as a function of temperature.