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Mostly it is used as a black- pigment -catalyst in the Haber process and in the water gas shift reaction. It is used as a contrast-agent in MRI scanning, whereas it is used as a pigment in magnetic applications, polishing compounds, cosmetics, medicines, polymer, rubber, filler, building, construction, appliances, and magnetic inks.
Tang, S.; Chia, G. H.; Lee, H. K. Magnetic core-shell iron(II,III) oxide@layered double oxide microspheres for removal of 2,5-dihydroxybenzoic acid from aqueous solutions. J. Colloid Interface Sci. 2015, , 437, 316-323.
Kerr, R.; Gonzalo, C. P.; Forsyth, M.; Jensen, B. W. The Reduction of Oxygen on Iron(II) Oxide/Poly(3,4-ethylenedioxythiophene) Composite Thin Film Electrodes. Electrochim. Acta 2015, , 154, 142-148.