Abstract
COLORATION of inorganic solids by ionizing radiations has been well known and studied for many years. The possibility that defects associated with such colour might bear a relation to the processes of adsorption and catalysis has been suggested1, but never directly observed. We have recently observed that the procedure which produces radiation enhancement of catalytic activity in silicas2, that is, irradiating a gel degassed at 500° C. or above with comparatively small (∼ 1019 eV./gm.) doses of cobalt-60 γ-rays or 50 keV. X-rays also produces a marked magenta coloration of the gel. The comparative rarity of such observations3,4, and their possible connexion with the radiation enhancement of catalytic activity2 have prompted this communication.
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References
Taylor, E. H., and Wethington, J. H., jun., J. Amer. Chem. Soc., 76, 971 (1954).
Kohn, H. W., and Taylor, E. H., J. Phys. Chem., 63, 966 (1959).
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Sandler, Y. L., J. Phys. Chem., 58, 56 (1954).
Report of Conference on Defects in Crystalline Solids, University of Bristol, 98 (1955).
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KOHN, H. Colour Centres produced by Radiation in Silica Gel. Nature 184, 630–631 (1959). https://doi.org/10.1038/184630b0
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DOI: https://doi.org/10.1038/184630b0
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