fig6

Figure 6. Ferroelectric properties, polarization response, and microstructure during the heating process of BNST ceramic. (A) P-E loops and (B) S-E curves of BNST 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 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 ceramic. (G) Raman spectra and the fitting results of thirteen Gaussian-Lorentzian peaks for BNST ceramic at different temperatures. (H) Variation of Gaussian-Lorentzian peak positions in regions I-III as a function of temperature.