Structural investigations on some cadmium-borotellurate glasses using ultrasonic, FT-IR and X-ray techniques

Glasses in the system 50B2O3-(50 − x)TeO2-xCdO with different CdO contents (0, 10, 20, 30, 40 and 50 mol%), have been prepared by melt quenching technique. Elastic properties, X-ray and FT-IR spectroscopic studies have been employed to study the role of CdO on the structure of the investigated glass system. Elastic properties and Debye temperature have been investigated using sound wave velocity measurements at 4 MHz at room temperature. The results showed that the density increase and the molar volume decrease while both sound velocities decrease with increase in x. Elastic properties, FT-IR and X-ray diffraction studies on the network structure of these glass structures, have revealed that Cd2+ ions are incorporated in the form of CdO6, decreasing the molar volume and compensate for the decrease in the average coordination number of tellurium atoms which was the reason for the increase in elastic moduli.