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Abstract
Glasses coloured by bismuth chalcogenides have been systematically studied. By doping with CdS(Se0 and changing the heat-treatment conditions, a new kind of near-infrared filter glass with high transmission and a cut-off wavelength of 1.0 to 1.5 μm was obtained. Glasses in the K 2OZnOSiO 2 and Na 2OK 2OZnOSiO 2 systems, with high high solubility for colorants, were chosen as base glasses. The effect of ZnO and Bi 2O 3 contents on the absorptivity of glasses was also studied. X-ray and electron diffraction, transmission electron microscopy (TEM) and energy-dispersive X-ray analysis (EDAX) studies demonstrated that, during the process of glass heat treatment, a solid solution of bismuth and cadmium chalcogenides occured, the composition of which varied with heat-treatment temperature. This resulted in a change in the absorptivity of the glasses. The colouring process in the glasses is discussed from the standpoint of thermodynamics and kinetics, which provide a satisfactory explanation for some of the phenomena observed in the experiments.
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