INFRARED-SPECTROSCOPY OF LEAD AND ALKALINE-EARTH ALUMINOSILICATE GLASSES

Infrared spectroscopic studies of lead and alkaline‐earth aluminosilicate glasses in the series xMO‐xAl2O3 (1 ‐ 2x)SiO2 M = Mg, Ca, Sr, Ba, and Pb; 0.05 x 0.275] were carried out in the range 2000 to 200 cm−1. Three major absorption bands were observed in the 1100‐, 800‐, and 500‐cm−1 regions. The frequency and the intensity of the 1100‐cm−1 band varied linearly with composition. For a specific value of x, the changes in the frequency, intensity, and bandwidth of this band decreased in the order Mg > Ca > Sr > Pb > Ba and the apparent disorder in the glass structure, effected by the substitution of aluminum, increased in the direction Mg < Ca < Sr < Ba, with Pb in between Mg and Ca. The force constants and the bond orders of the Si‐O and Al‐O stretching vibrations in each of the glasses increased monotonically as Al/(Al + Si) decreased. Copyright © 1990, Wiley Blackwell. All rights reserved