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In this study, the brownmillerite CaFeO 2.5+δ  sample has been prepared by co-precipitation method. The brownmillerite CaFeO 2.5+δ  sample crystallizes in a distorted orthorhombic (Pcmn space group) structure as confirmed by Rietveld analysis of the X-ray diffraction (XRD). Structural characterization also of the brownmillerite CaFeO 2.5+δ  sample has been carried out by field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDS), and ultra-high resolution transmission electron microscopy (UHR-TEM). Mössbauer spectroscopy revealed that the brownmillerite CaFeO 2.5+δ  sample contained Fe 3+  in both octahedral and tetrahedral sites. Furthermore, there is Fe 3.5+  in the octahedral site because of the excess oxygen content (δ = 0.0185). The UV-Vis. absorption spectrum of the brownmillerite CaFeO 2.5+δ  sample exhibits two absorption peaks in the UV range and two broad absorption peaks in the visible range. The hysteresis loop M (H) of the brownmillerite CaFeO 2.5+δ  sample indicated the presence of antiferromagnetic ordering with a small amount of weak ferromagnetic. Present results support that the brownmillerite CaFeO 2.5+δ  sample is useful for industrial applications.

Study the influence of the crystal structure of the co-precipitated brownmillerite CaFeO 2.5+δ sample on optical and magnetic properties