Magnetic properties of nanocomposites of mixed oxides of iron and chromiumsynthesized under different oxidative environments

Synthesis of nanocomposites of mixed oxides of Fe and Cr in a copolymer mat rix of aniline and formaldehyde at room temperature along with IR, XRD and Fe-57 Mossbauer studies on as synthesized as well as the samples on heating at different temperatures is described. The XRD and 57Fe Mossbauer studies show the formation of nanosized iron oxide particles. These studies furthe r show the formation of nanosized particles of metal oxides and formation o f solid solution of iron and chromium oxide on heating the samples at 700 d egrees C. Further, the IR studies show that the polymeric backbone is stron gly influenced by different reaction conditions and lead to variable magnet ic character in the heated samples as shown by their Mossbauer studies.