Figure 4

(a) Raman scattering spectra of BaFeO_3−δ solid solution into Na_0.5Bi_0.5TiO₃ with various concentrations from 200 cm⁻¹ to 1000 cm⁻¹; and (b) deconvolution Raman peaks of pure Na_0.5Bi_0.5TiO₃ and 5 and 9 mol% BaFeO_3−δ solid solution into Na_0.5Bi_0.5TiO₃.