Structure and elastic properties of TeO 2–BaF 2 glasses

• Published in: The Journal of physics and chemistry of solids Vol. 67; no. 8; pp. 1697 - 1702
• Main Authors: Nishara Begum, A., Rajendran, V.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2006
• Subjects: A. Glasses; C. Ultrasonic measurements; D. Elastic properties; D. Elastic properties; A. Glasses; C. Ultrasonic measurements
• ISSN: 0022-3697; 1879-2553
• DOI: 10.1016/j.jpcs.2006.03.007

Binary tellurite (100− x)TeO 2– xBaF 2 glasses for different compositions of BaF 2 ( x = 8 , 10, 12, 15, 18 and 20 wt%) have been prepared by rapid quenching method. The velocities and attenuation during the propagation of the ultrasonic waves in all glasses were measured using a transducer operated at a fundamental frequency of 5 MHz at room temperature. A progressive increase in BaF 2 content leads to a decrease in ultrasonic velocities and density, which is followed by an increase in attenuation. The existence of depolymerisation of Te co-ordination leads to the transformation of TeO 4 trigonal bipyramid units through TeO 3+1 polyhedron to TeO 3 trigonal pyramid units. This is responsible for the observed decrease in the measured and determined parameters with the addition of the modifier content.