Abstract
AbstractThe objects of investigation were Li2O·2SiO2 glass samples cutted out of the initial and the extruded glasses along and across the extrusion axis. All the glasses contained iron microimpurities (∼80 ppm). Some glasses were doped with Tb3+ ions the luminescence characteristics of which depend on average distances Tb3+ ‐Tb3+. It has been shown that the rates of radiation color centers accumulation as well as the rates of their isothermal annealing, on one hand, the absorption spectra of iron microimpurities, on the other hand, and finally the spectroscopic properties of terbium ions have been changing regularly when passing from extruded longitudinal sample to initial and finally to extruded transverse ones. All these results convincingly show that, under the conditions of extrusion, glass structure becomes less dense in its direction and more dense in the perpendicular one.
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