Iron nanoparticles in copper matrix prepared by sol-gel route

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Abstract
Iron particles having diameters around 8 nm and loosely packed with nanosized copper particles have been prepared by a sol‐gel route. The samples exhibit coercivities in the range 200 to 500 Oe that are typical of single‐domain iron grains. The Mössbauer spectrum is consistent with the presence of α‐Fe particles in the system. However, a finite value of the isomer shift is obtained that is ascribed to possible electron transfer between the iron atoms and the surrounding copper matrix.