Abstract
Results of measurements of the d.c. electrical conductivity, optical absorption edge and infrared optical absorption of GeO2-TeO2 glasses are reported. Conduction in these glasses is found to be electronic and the hopping of polarons seems to be the dominant process in the transport mechanism. The electrical activation energy decreases with the increase of tellurium content and this decrease corresponds to a decrease in the optical energy gap. The optical gap is of the order of 2.74 eV, somewhat lower than for many other oxide based glasses. Most of the sharp absorption bands characteristic of the basic materials GeO2 and TeO2 are modified with the formation of broad and strong absorption bands in the process of going from the crystalline to the amorphous state. Density measurements show the glasses to have a compact structure.
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Ahmed, M.M., Hogarth, C.A. & Khan, M.N. A study of the electrical and optical properties of the GeO2-TeO2 glass system. J Mater Sci 19, 4040–4044 (1984). https://doi.org/10.1007/BF00980769
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DOI: https://doi.org/10.1007/BF00980769