Titlebook: LACAME 2008; Proceedings of the 1 J. Desimoni,C.P. Ramos,R.C. Mercader Conference proceedings 2009 Springer-Verlag Berlin Heidelberg 2009 M

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,Eleventh Latin American conference on the applications of the M?ssbauer effect, LACAME 2008, La Pla

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Reduction of hematite with ethanol to produce magnetic nanoparticles of Fe,O,, Fe,O or Fe, coated whanol in a Temperature Programmed Reaction up to 950°C. XRD and M?ssbauer measurements showed after reaction at 350°C the partial reduction of hematite to magnetite. At 600°C the hematite is completely reduced to magnetite (59%), wüstite (39%) and metallic iron (7%). At higher temperatures, carbide

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Niobian iron oxides as heterogeneous Fenton catalysts for environmental remediation,is based on the reaction between Fe. and H.O. to produce highly reactive intermediate hydroxyl radicals (.OH), which are able to oxidize organic contaminants, whereas the Fenton-like reaction is based on the reaction between Fe. and H.O.. These heterogeneous systems offer several advantages over the

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,M?ssbauer spectroscopy study of a mineral sample from Oshno Hill, District of Chavín de Pariarca, Hince, Huanuco, Peru, indicates the presence of lepidocrocite (.-FeOOH) and goethite (.-FeOOH). The room temperature M?ssbauer spectrum (MS) doublet with broad lines displays hyperfine parameters corresponding to the presence of particles of iron hydroxides smaller than 100?? in a superparamagnetic r