Abstract
Bismuth borotellurite glass systems in the form of 65B2O3-12.5TeO2-12.5Bi2O3 - (10-x) Na2O - xNdCl3, x=0, 1, 2, 5, and 10 mole % were melted by traditional method and their amorphous nature were examined by using XRD technique. Densities of the prepared glasses were measured and molar volumes were calculated. The ultrasonic pulse-echo technique at 4 MHz nominal frequency was used to calculate ultrasonic velocities (both of Longitudinal and Shear together). Many of known elastic moduli, such as, longitudinal (L), shear (G), Young (E) and bulk (K) moduli were obtained by using the measured density and ultrasonic velocities. Also Poisson's ratio (σ), the softening temperature (TS), Debye temperature (θD), and microhardness (H) were calculated. The glass transition (Tg) temperature, the crystallization temperature (Tc) and the glass satiability parameters (KSP) could be calculated from the Differential thermal analysis (DTA) that has been carried out in the temperature range from 300 to about 1100 oK for all prepared samples. It is noticed that the mechanical properties (elastic moduli and hardness) of the prepared glass increase with increase of NdCl3%. Also, the softening temperature, the glass transition temperature and stability increase with the increase of NdCl3 % content.