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Preparation and characterization of uniform coated particles (Cobalt compounds on cadmium compounds)

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Abstract

Uniformly dispersed particles of CdCO3 were prepared by homogeneous precipitation from aqueous solutions of cadmium sulphate and urea at the elevated temperatures. These particles were then employed as cores for coating with 2CoCO3·Co(OH)2·H2O from cobalt nitrate and urea solutions at 85°C. In the absence of cores, when heated under similar conditions, the coating solutions produced nearly uniform particles of 2CoCO3·Co(OH)2·H2O. On calcination at 700°C, the core [CdCO3], coated [CdCO3/2CoCO3·3Co(OH)2], and coating precursor [2CoCO3·Co(OH)2·H2O] particles transformed into CdO, CdO/Co3O4, and Co3O4, respectively. No sintering occurred during calcination and the particles preserved their morphological features to a significant extent.

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Authors and Affiliations

  1. National Centre For Excellence in Physical Chemistry, University of Peshawar, Peshawar-, 25120, NWFP, Pakistan

    I. U. Haq

  2. National Centre For Excellence in Physical Chemistry, University of Peshawar, Peshawar-, 25120, NWFP, Pakistan

    K. Akhtar

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  1. I. U. Haq
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  2. K. Akhtar
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Haq, I.U., Akhtar, K. Preparation and characterization of uniform coated particles (Cobalt compounds on cadmium compounds). Journal of Materials Science 35, 2565–2571 (2000). https://doi.org/10.1023/A:1004762928982

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