A Study of the Influence of Thermal History on the Absorption
of SodiumCalcium Silicate Glass at a Wavelength of 3.4 m
in the Temperature Range 20630C

O. A. Prokhorenko, O. V. Mazurin, M. V. Chistokolova, and I. N. Anfimova

Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences,
ul. Odoevskogo 24/2, St. Petersburg, 199155 Russia

Abstract—The paper discusses the results of a preliminary study on the effect of thermal history of samples
on the IR absorption at a wavelength of 3.4 m in commercial sheet glass [containing 0.7 wt % (FeO + Fe₂O₃)]
and the corresponding glass-forming melt in the temperature range 20–630°C. The investigation is performed
by two techniques traditionally applied to reveal how the structural relaxation affects the properties of glasses
and melts. First, the optical density of glass samples is measured upon heating and cooling in the given temper-
ature range at a rate of 3 K/min. Second, glass samples characterized by different thermal histories are prepared,
and their absorption is measured at room temperature. It is found that the reversible changes in the glass samples
affect the IR absorption at 3.4 m. The errors of measurements and reproducibility of the experimental data
obtained are reported, and a conclusion is drawn about the sufficiently high reliability of the observed effects.

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