Cobalt–iron hydroxycarbonates and their evolution to mixed oxides with spinel structure

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Abstract
Cobalt(ii)–iron(iii) mixed hydroxides with hydrotalcite-like structure have been synthesized. Depending on the experimental conditions during synthesis, CoII becomes partially oxidized to CoIII . The solids have been characterized by X-ray diffraction, FTIR spectroscopy, temperature-programmed reduction and nitrogen adsorption at low temperature for specific surface area assessment. Reduction of FeIII takes place at lower temperatures than that of bulk Fe3O4 . Thermal treatment in air leads to oxidation of CoII to CoIII , in the same temperature range where collapsing of the layered structure by decarbonation is observed. The nature of the spinel phases formed upon calcination at high temperature depends both on the calcination temperature and the calcination time.

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