Elastic moduli of borosilicate glasses doped with heavy metal oxides

• Results show good agreement between experimental and theoretical elastic moduli.
• Number of bond per unit volume decreases with adding of TiO2, BaO and Bi2O3 oxide.
• Adding TiO2 and BaO causes the reduction of average stretching force constant.
• Adding Bi2O3 causes the increase of average stretching force constant.

Comparative studies on the theoretical and experimental values of elastic moduli of the borosilicate glasses (70-x)SiO2–30B2O3–xHMOs glass system, where HMOs (heavy metal oxides) are TiO2, BaO and Bi2O3 with 0, 1, 2, 3, 4 and 5 mol% of each HMO, were investigated. Elastic moduli were assessed by measuring the ultrasonic velocities. The number of network bonds per unit volume, the average of a stretching force constant, the average of cross-link density, the average of ring diameter and the theoretical bond compression bulk modulus were calculated by using a theoretical bond compression model to confirm the obtained results from the experiments. The results show that changes in the structure of the glass depend on a type and concentration of HMOs. Moreover, the experimental elastic moduli are in good agreement with the theoretical values.