“…Bismuth ferrites, a large group of transition-metal oxides, including perovskite, mullite, and sillenite-type structural compounds have lately sparked the interest of researchers due to their superior fundamental physics and wide-ranging technological applications. , Among them, perovskite-type BiFeO 3 (BFO) with a suitable band gap of ∼2.2 eV and the existence of simultaneous ferroelectric and ferromagnetic ordering at room temperature is mostly studied in the field of visible-light responsive photocatalysis . Compared to perovskite BFO, the synthesis and analysis of other phases such as sillenite-type Bi 25 FeO 40 with the I 23 cubic crystal structure are yet less explored. , The sillenite compounds, bearing the general formula of Bi 12 MO 20 (M = Ge, Ti, Ga, Fe, Bi, V, etc), exhibit unique properties such as photo-refractivity, optical activity, and photo-conductivity .…”