Abstract
Tellurite glasses of the system (100 − x)TeO 2– xBaO for different compositions of BaO ( x = 9, 12, 15, 18, 20 and 22 wt.%) have been prepared by rapid quenching method. A decrease in ultrasonic velocities and density, which is followed by an increase in attenuation with a progressive increase in BaO content has been observed at room temperature and also over a wide range of temperatures. The above results reveal the softening of the glass network due to the progressive transformation of the rigid framework characteristics of TeO 2 resulting in the formation of distorted TeO 3 + 1 units followed by the creation of regular TeO 2 (4 → 3 + 1 → 3) sites and the formation of ionic character bond (NBO).
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