Abstract
Beveridge and Denbigh1 have directed attention to the development of a concentric shell of zinc oxide when a compressed sphere of zinc sulphide powder was oxidized in air at 1,250° C. This shell was presumed to arise from the reaction between zinc and sulphur diffusing outwards from the surface of the zinc sulphide and oxygen diffusing inwards. The distance between the core and the shell increased with increasing temperature, and the diameter of the shell was greater than the diameter of the original core. During the oxidation of a crystal of galena (lead sulphide) to lead sulphate we have observed the formation of an approximately spherical product layer detached from and concentric with the galena crystal. The mechanism by which this product layer is formed appears to differ from that proposed for zinc oxide1.
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References
Beveridge, G. S. G., and Denbigh, K. G., Nature, 183, 106 (1959).
Kellogg, H. H., and Basu, S. K., Trans. Metal. Soc. A.I.M.E., 218, 70 (1960).
Stubbles, J. R., and Birchenall, C. E., Trans. Metal. Soc. A.I.M.E., 215, 535 (1959).
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CULVER, R., GRAY, N. & SPOONER, E. Oxidation of Galena to Lead Sulphate. Nature 190, 78–79 (1961). https://doi.org/10.1038/190078a0
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DOI: https://doi.org/10.1038/190078a0
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