Co_3O_4 was prepared in aqueous solutionsthrough a staged oxidation process. When the mole ratio ofstarting chemicals Co~(2+):OH~- is 1:2 (OH~- as alimiting reagent), the reaction path changes to the brucite-like tohydrotalcite-like phase, and then to the spinel. Using the presentmethod, Co_3O_4 can be formed at a temperature as low as 40deg C, and single-phase spinel Co_3O_4 can be prepared at 50deg C within hours under normal atmospheric pressure.
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Laboratoire de Physico - & Toxico-Chimie (LPTC) des Systems Naturels UMR 5472 CNRS, Universite de Bordeaux I, 351, cours de la Liberation 33405 Talence Cededx, France.;
