Correlation between structural features and vis-NIR spectra of {alpha}-Fe{sub 2}O{sub 3} hematite and AFe{sub 2}O{sub 4} spinel oxides (A=Mg, Zn)
- Bordeaux Institute of Condensed Matter Chemistry, ICMCB-CNRS, 87 Avenue du Dr. Albert Schweitzer, 33608 Pessac Cedex (France)
Iron (III) rich pigments MgFe{sub 2}O{sub 4} and ZnFe{sub 2}O{sub 4} spinel ferrites and {alpha}-Fe{sub 2}O{sub 3} hematite were synthesized by Pechini route and precipitation process, respectively. The compounds were characterized by X-ray diffraction (XRD), Moessbauer spectroscopy and visible-NIR spectroscopy. Diffuse reflectance spectra were interpreted in regard of structural features of the three oxides in order to correlate absorption bands positions with structural parameters. It has been demonstrated that the two main absorption edges occurring in visible range (400-800 nm) can be attributed to two 2p(O{sup 2-}){yields}3d(Fe{sup 3+}) charge transfers, the energy being directly linked to the distortion degree of the [FeO{sub 6}] octahedra. - Graphical abstract: UV-visible-NIR reflectance of iron red pigments: MgFe{sub 2}O{sub 4}, ZnFe{sub 2}O{sub 4} spinels and Fe{sub 2}O{sub 3} hematite, were analyzed in regard of their structural features: cationic distribution, geometry of the Fe{sup 3+} sites, iono-covalence of the bonds.
- OSTI ID:
- 21128280
- Journal Information:
- Journal of Solid State Chemistry, Vol. 181, Issue 5; Other Information: DOI: 10.1016/j.jssc.2008.02.009; PII: S0022-4596(08)00074-1; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
Similar Records
(De)lithiation of spinel ferrites Fe3O4, MgFe2O4, and ZnFe2O4: a combined spectroscopic, diffraction and theory study
Nanocrystalline spinel ferrite (MFe{sub 2}O{sub 4}, M = Ni, Co, Mn, Mg, Zn) powders prepared by a simple aloe vera plant-extracted solution hydrothermal route