Abstract
KrF laser-induced photolysis of Fe(II) acetylacetonate in 2-propanol leads to (i) formation of nanosized iron and (ii) etching of the silica reactor by carbonaceous photolytic products, yielding amorphous polyoxocarbosilane. These reactions allow chemical solution deposition of Fe/polyoxocarbosilane/carbon nanocomposite possessing rare amorphous Fe phase. The material in ambient air undergoes slow oxidative passivation of the Fe constituent forming a discontinuous a-Fe 2O 3 shell and when heated it transforms to nanosized crystalline α-Fe 2O 3/polyoxocarbosilane/carbon nanocomposite. Its magnetic moment is a superposition of ferromagnetic contribution from large particles and superantiferromagnetic contribution from the thin passivating shell.
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