The nanocrystalline iron samples were carburised with CO:CO₂ (98:2) mixture at the temperature of 450 ^OC. The obtained product contained 29 % of Fe₃C, 35 % of Fe₃O₄ and 36 % of C in form of carbon fibers. This composite was used as a filler for epoxy resin.
The electric and magnetic properties of the obtained polymer composites were studied.
The obtained polymer product is semi-conductive. The conductivity increases with increasing content of the iron-carbon filler in the polymer composite. The filler has no effect on the dielectric properties of the polymer composite.
The results of the EPR studies show a superparamagnetism of the polymer composite. A dramatic change of the EPR signal intensity is observed at the temperature of 80 to 81 K. This effect is connected with the II order phase transition at the temperature between 80 and 81 K.

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