New ferromagnetic semi-conductors are interesting because of the expectations connected with their use in magnetoelectronic or spintronic devices. Potential candidates are semi-conductive oxides of metals doped with ions or oxides of transition metals, as for example zinc oxide doped with iron oxide. Such samples were prepared by wet chemical method - precipitation from nitrate solutions using ammonia. The obtained hydroxides were filtered, dried and calcined at 300 ⁰C during 1 hour. A series of samples containing 5 to 95 wt.% of Fe₂O₃ was obtained. The prepared samples are ferromagnetic. The phase composition of the samples was determined using XRD. Depending on the chemical composition the phases of hexagonal ZnO, and/or romboedric Fe₂O₃ and/or cubic ZnFe₂O₄ were identified. The mean crystallite size of these phases, determined using Scherrer’s formula, varied from 8 to 30 nm. The real chemical composition of the samples determined using ICP AES method was close to the assumed one. The measurements of density and surface area showed a good quality of nanopowders. The morphology of the samples was investigated using scanning electron microscopy. Spherical or elongated nano-grains can be observed. The measurements of magnetization were also carried out.

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