Abstract
In this study, the brownmillerite CaFeO2.5+δ sample has been prepared by co-precipitation method. The brownmillerite CaFeO2.5+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 CaFeO2.5+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 CaFeO2.5+δ sample contained Fe3+ in both octahedral and tetrahedral sites. Furthermore, there is Fe3.5+ in the octahedral site because of the excess oxygen content (δ = 0.0185). The UV-Vis. absorption spectrum of the brownmillerite CaFeO2.5+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 CaFeO2.5+δ sample indicated the presence of antiferromagnetic ordering with a small amount of weak ferromagnetic. Present results support that the brownmillerite CaFeO2.5+δ sample is useful for industrial applications.
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