Lightweight magnetic ceramics containing bimetallic (Co–Fe) nanoparticles in an essentially amorphous C/SiC matrix have been prepared from the pyrolysis of a polyferrocenylsilane with pendant cobalt clusters. The Figure shows a TEM image of the ceramic material formed at 600 °C under N2. Superparamagnetic or ferromagnetic particles may be made, depending on the pyrolysis temperature.
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Berenbaum et al. (2003) studied this question.
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