Fig. 2.

a Fluorescence images, average luminous intensities, and PL patterns of Fe₂O₃–XFe₂O₄ by the excitation of 405 nm. b reflects the DRS patterns and confrontation between experimental and calculated band gaps of Fe₂O₃–XFe₂O₄. The absorption bands were tested through the slopes of diffuse reflectance curves that the experimental and calculated band gaps are similar with each other. c shows the calculated dielectric functions and spin-PDOSs of Fe₂O₃–XFe₂O₄