Studies on Preparation of Inorganic Powders by Interfacial Reaction Method (V):Properties of the Spherical Particles of Cobalt (II) Carbonate and Cobalt (II, III) Oxide
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概要
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The spherical particle3 of CoCO<SUB>3</SUB> were prepared by interfacial reaction method, in which the cobalt carbonate was formed by the reaction of CoSO<SUB>4</SUB> aqueous solution emulsified in benzene with NaHCO<SUB>3</SUB> aqueous solution. Properties of the CoCO<SUB>3</SUB> spherical particles were determined by measuring specific surface areas, X-ray diffraction patterns, particle size distributions, adsorption isotherms of water vapor, microphotographs, and DTA-TG curves. Some properties of the CoCO<SUB>3</SUB> spherical particles are shown in Table 1. <BR>It was found that the CoCO<SUB>3</SUB> spherical particles were composed of the micro crystal of CoCO<SUB>3</SUB> (Spherocobaltite) and possessed highly porous structure, and also found that CoO spherical particles and Co<SUB>3</SUB>O<SUB>4</SUB> spherical particles were formed by thermal decomposition of the CoCO<SUB>3</SUB> spherical particles. <BR>Above measurements were also carried out for the Co<SUB>3</SUB>O<SUB>4</SUB> spherical particles prepared by thermal decomposition of the CoCO<SUB>3</SUB> spherical particles at 500°C and properties of the Co<SUB>3</SUB>O<SUB>4</SUB> spherical particles were determined. The results showed that the Co<SUB>3</SUB>O<SUB>4</SUB> spherical particles were also composed of the micro crystal of Co<SUB>3</SUB>O<SUB>4</SUB> and possessed highly porous structure. <BR>High-temperature reduction of the Co<SUB>3</SUB>O<SUB>4</SUB> spherical particles was also examined and it was found that spherical particles of cobalt metal were formed.
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