Effect of fluoride ion incorporation on the structural aspects of barium–sodium borosilicate glasses

Corrosion of Borosilicate Glasses Subjected to Aggressive Test Conditions: Structural Investigations

“…14 Extensive studies have been carried out by our group earlier on both NBS and barium sodium borosilicate (BBS) glasses containing different constituents such as sulfates, fluorides, thorium oxides, mixture of thorium oxide and uranium oxides, Cs 2 O, TiO 2 , BaO, CaO, ZnO etc., with a view to understand their solubility limits in the above glass compositions, structural modifications brought about by them as well as thermal stability of glasses. [15][16][17][18][19][20][21] These studies have confirmed that increased number of nonbridging oxygen atoms in BBS glass compared to NBS glass facilitates incorporation of different nuclear waste components in the glass. The inference is further confirmed by 17 O NMR study of Zhao et al 22 Structural units constituting the glass have a strong influence on important properties like leaching and thermal volatilization.…”

“…[15][16][17][18][19][20][21] These studies have confirmed that increased number of nonbridging oxygen atoms in BBS glass compared to NBS glass facilitates incorporation of different nuclear waste components in the glass. The inference is further confirmed by 17 O NMR study of Zhao et al 22 Structural units constituting the glass have a strong influence on important properties like leaching and thermal volatilization. Leaching and thermal volatilization studies were carried out by our group earlier on Cs-containing borosilicate glasses with different additives like TiO 2 , ZnO, BaO, CaO etc.…”

“…The former (NBS glass) is a candidate for immobilization of nuclear waste from pressurized heavy water reactors and the latter (BBS glass) for immobilization of waste from AHWR. Our earlier studies [15][16][17][18][19][20][21] have showed improved durability and higher Cs (and also nuclear waste) loading capability for the above two glass compositions. Techniques like XRD, scanning electron microscopy (SEM), solid-state NMR have been used to monitor leaching-induced structural modifications and phase formations.…”

A comparative study on the structural aspects of sodium borosilicate glasses and barium borosilicate glasses: Effect of Al2O3 addition

“…Further, our earlier studies [5] have revealed that addition of BaO in sodium borosilicate glass helps in improving the solubility of sulphate ions containing nuclear waste in the glass. BaO incorporated sodium borosilicate glasses are also found to be good candidate for immobilizing HLW generated from thorium based nuclear reactors, where ThO 2 will be used as the main matrix for fuel material [6][7][8][9][10]. As mentioned earlier, constituents of HLW originating from reprocessing of spent fuel of thorium based reactors are different from that of uranium based reactors.…”

“…De-convolution based on a Gaussian fit resulted in two peaks with chemical shift values around −100 and − 91 ppm. From earlier 29 Si MAS NMR studies on borosilicate glasses [6][7][8][9], the peaks around −100 and −91 ppm have been attributed to the Q 3 and Q 2 structural units of silicon (where Q n represents silica structural units having "n" number of bridging oxygen atoms). The relative concentration of Q 3 and Q 2 structural units are found to be in the ratio of 35: 65 in the base glass.…”