Abstract

The oxidation of pulverulent CoO (ex Co(OH) 2) into Co 3O 4 is a topotactic and pseudomorphic reaction. According to the degree of porosity and to the crystallite size of the original CoO oxide the reaction was found to proceed following two different mechanisms: monophasic or diphasic. From a textural point of view one must emphasize the following features: Co 3O 4 maintains the same porosity as the original CoO whereas the crystallite desorientation becomes more important. When this Co 3O 4 is submitted to a thermal treatment the porosity remains again identical; on the contrary, the crystallites are growing up.

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