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.