Spectroscopic investigation of (0.98?x)Na2B4O7�0.02UO3�xTiO2 glasses

An optical spectroscopic study of borate glasses containing uranium ions

“…Our optical data, in agreement with previous data [2][3][4], prove that the redox chemistry of uranium ions in the studied glasses can be described by the U>!U>!U> equilibrium. The amount of uranium ions in reduced valence states ( #4, and #5) is higher in glasses containing B O than in those containing Na B O .…”

“…1. According to prior assignments [2][3][4] the optical absorption features shown in this figure (marked with arrows) are due to uranium ions in their #4, #5 and #6 valence states. Thus, the absorption bands at &15,600 cm\ and &23,240 cm\ are due to U> ions in eightfold coordination, the shoulder at &20,400 cm\ and the band at &24,090 cm\ are due to U> ions appearing as UO> species, while the absorption band at 13,700 cm\ is assigned to U> ions in sixfold coordination [2][3][4].…”

“…Spectroscopic data obtained for some borate and borosilicate glasses containing U O or UO revealed the presence of uranium ions in different valence stages (#6, #5 and #4) and permitted the study of their redox equilibrium [2][3][4]. To extend the available information on glasses containing uranium ions we investigated some optical properties of different borate glasses containing UF , UO and UO .…”

Spectroscopic studies of lead arsenate glasses doped with nickel oxide

“…A number of researchers have done a commendable work on improving the physical properties of As 2 O 3 glasses by adding certain semiconducting oxides like V 2 O 5 and Sb 2 O 3 [7][8][9][10]. We too have reported a considerable number of studies on the influence of certain transition metal ions on the structure and physical properties of PbO-As 2 O 3 glasses; these studies have yielded valuable information on the chemical durability, insulating and mechanical strengths of these glasses [11][12][13].…”