THERMAL STABILITY AND STRUCTURAL STUDIES IN THE TeO2–ZnO–MgO–Li2O–Er2O3 GLASS SYSTEM

Abstract

Series of (80-x)TeO₂-18ZnO-1MgO-1Li₂O-xEr₂O₃ glass system (0.5mol.% £ x £  2.5 mol.%) has successfully been made by melt quenching technique. The thermal stability and structure of glass has been investigated by means of TG/DTA and FTIR spectroscopy. The thermal parameters, such as the glass transition temperature (T_g), crystallization temperature (T_c) and thermal stability (T_c - T_g) were determined. It is found that this system provides a wide and stable glass formation in which the glass stability around 97 °C- 117 °C may be obtained. The broad absorption peaks were observed around 657 cm^-1 - 671 cm^-1 and 755cm^-1-758cm^-1, which correspond to the stretching vibration mode of TeO₄ tbp and TeO₃ tp, respectively. The absorption peaks around 1600 cm^-1 and 3400 cm^-1 are assigned to a stretching vibration of the hydroxyl group participating in the strong metal and hydrogen bonding respectively.