Preparation and characterization of uniformly coated particles by homogeneous precipitation (cobalt compounds on nickel compounds)

Authors: Haq, Ikram ul; Akhtar, Khalida

Source: Advanced Powder Technology, Volume 11, Number 2, 2000 , pp. 175-186(12)

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Abstract:

Nickel basic carbonate [NiCO₃ · Ni(OH)₂ · H₂O] particles were coated with crystalline cobalt carbonate (CoCO₃) by heating their suspension in an aqueous solution of cobalt nitrate and urea at elevated temperatures. In the absence of core particles, the same reactant mixture produced a dispersion of amorphous cobalt basic carbonate [2CoCO₃ · Co(OH)₂ · H₂O] particles. On calcination at 700°C, the shell and core materials of the coated particles transformed, respectively, into Co₂O₃, and NiO, while producing a third phase (NiCo₂O₄) at the core/coating interface. No sintering was observed during calcination and the particles retained their morphological features to a significant extent.

Keywords: Powders; coated particles; homogeneous precipitation

Document Type: Original article

DOI: http://dx.doi.org/10.1163/156855200750172295

Publication date: 2000-06-01