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Synthesis of Fibrous Cobalt Oxalate by a Double-Jet Process: Morphology and Growth Control

JOM, ISSN: 1543-1851, Vol: 71, Issue: 8, Page: 2884-2890
2019
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Cobalt oxalate particles with a fibrous shape were prepared by a double-jet process with CoCl solution and (NH)CO + NH·HO solution. The formation mechanism of the fibrous cobalt oxalate and the effects of temperature, pH value, feeding rate, ion concentration and PVP25 addition on the particle morphology and particle size were studied in this work. There were two kinds of cobalt oxalate precipitations in the Co-NH-CO-HO system. When free ammonia was sufficient in this system, CO and Co(NH) (n = 1,2,…,6) would combine to form fibrous Co(NH)CO·2HO precipitation, otherwise square columnar β-CoCO·2HO formed. The changes in nucleation and growth supersaturation had a great effect on particle morphology and size. The fibrous morphology of cobalt oxalate was formed by the Ostwald ripening mechanism.

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