The structural properties of CdO–Bi2O3 borophosphate glass system containing Fe2O3 and its role in attenuating neutrons and gamma rays

Mechanical, Thermal and Chemical Durability Behaviors of CdO-Bi<sub>2</sub>O<sub>3</sub> Boro-Phosphate Glasses Containing Fe<sub>2</sub>O<sub>3</sub>

“…The observed increase in H is related to the increase of the rigidity of glass. These results are consistent with the density and IR results [7] which indicated that addition of Bi 2 O 3 strengthened the bond energy between Bi-O and Fe-O. These results are also in agreement with the results obtained by Kurkjian [9].…”

“…The non-linearity in the values of ΔT x , which showed large, pronounced increase for the glasses containing 10 and 15 wt% Bi 2 O 3 , Figure 4 is consistent with the durability behavior. The sudden enhancement of chemical durability with decreasing the glass transition temperature at the same time on replacing 10 wt% and 15 wt% CdO by Bi 2 O 3 can be attributed to the structural changes that strengthen the network, as observed from IR results [7], at these Bi 2 O 3 concentrations. As stated before [16] A. Inoue, Y. Yokoyama, Y. Shinohara and T. Masumoto, Mater.…”

“…water resistance ability of phosphate glass. The non linearity in the values of DR and hence in chemical durability with Bi 2 O 3 content especially for the sample with 10 wt% Bi 2 O 3 which showed sudden and large decrease in DR than that with 5 wt% Bi 2 O 3 can be interpreted from the IR results [7], which proved that for the glass containing 10 wt% Bi 2 O 3 , some of Bi atoms entered the glasses as a former with an increase also in the FeO 4 percentage which is proved [16] to increase in the chemical durability. This is beside the formation of P-O-Bi and/or P-O-Fe cross link with relatively high density for the present glasses with Bi 2 O 3 of 10 wt% and 15 wt%.…”

“…It can be observed that the micro hardness is decreased slightly as compared to that of the original samples. This means that the effect of γ ray irradiation on the P-O-Bi and/or P-O-Fe bonds [7], and hence the glass hardness is small, especially at concentrations from 10 wt% to 20 wt% Bi 2 O 3 as can be seen in Table 1 and Figure 1. The small decrease in the values of the hardness with increasing the irradiation dose to 10 Gy can be attributed to irradiation induced defects.…”

“…, which was proved [7] through its attenuation to fast neutrons and gamma rays its ability to be used as a super shield, to insure its validity also for the usage as a radioactive waste disposal matrix. So it was necessary also to study the effect of γ radiation on its hardness and chemical durability.…”