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Figure 4. Polarization response and microstructure under electric field of BNST-0.01FN ceramic. (A) J-E curves of BNST-0.01FN ceramic samples at different applied electric fields. (B) Amplitude image and (C) phase image of domain structures in BNST-0.01FN ceramic. (D) Local switching spectra obtained via PFM, showing phase and amplitude response as a function of electric field. (E) Raman spectra and the fitting results of thirteen Gaussian-Lorentzian peaks for BNST-0.01FN ceramic at various electric fields. (F) Variation of Gaussian-Lorentzian peak positions in regions I-III as a function of electric field. (G) Comparison of Raman spectra for poled and unpoled BNST-0.01FN samples.