Abstract
The modified thermomechanical analyser, using penetration method based on the coaxial action of light and applied force, proved to be a suitable tool for the measurements of photo-viscous changes in selected chalcogenide and phosphate glasses (As2S3 and (PbO)55(ZnO)10(P2O5)35 with 3.6 mol% CoO). Measurements of photo-viscous changes at temperatures close to the glass transition temperatures were performed and the highest photo-viscous changes were observed in both glasses using 650 nm wavelength. The effect of light on viscous flow was transient. The decrease in the dilatometric glass transition temperature upon illumination was also observed. The decrease of the light effect with the temperature in As2S3 and the independent temperature behavior in phosphate glass could be probably connected with the different nature of photo-viscous changes. In As2S3, a certain contribution of athermal photo-structural changes is assumed, in phosphate glass containing Co2+ ions, only the temperature rise is considered to be the mechanism.
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