The structural role of tungsten ions in PbO–Sb2O3–As2O3 glass-system by means of spectroscopic investigations

Characterization of new Sb 2 O 3 -based multicomponent heavy metal oxide glasses

“…Crystalline Sb2O3 exhibits four fundamental absorption bands: symmetric stretching vibrations ν1 (925 cm -1 ), symmetric bending vibrations ν2 (600 cm -1 ), doubly degenerate stretching vibrations ν3 (710 cm -1 ) and doubly degenerate bending vibrations ν4 (485 cm -1 ). The network structure of the glass is found to be double chains consisting of four membered rings of SbO3 pyramids similar to the valentinite form [21,[41][42][43]. As reported in the literature, during synthesis of glasses at high temperatures, small part of Sb 3+ (in Sb2O3 used as the raw material)…”

Spectroscopic studies of tungsten ions in PbO–PbF2–SiO2 glasses

“…The solution of the preceding equation gives the principal values of g and A tensor. The values of the g factor observed in the ranges 1.74b g b 1.75, 1.65b g ( b 1.68, and hyperfine coupling tensors are 46 b A ⊥ (X 10 − 4 cm − 1 ) b 51, 120 b A ‖ (X 10 − 4 cm − 1 ) b 125 [28,29]. The ESR data indicate that W 5+ ions are present in axially distorted octahedral positions with a short W-O bond and an opposite long W-O bond along the symmetry axis of oxygen ions.…”

“…It is placed in an automatic temperature controlled furnace at a temperature range 1380-1420°C for 30 min. The molten form of the material is poured on the brass mould for the required shape and it is placed in the annealing furnace kept about 350°C and Journal of Non-Crystalline Solids 358 (2012) [25][26][27][28][29] subsequently cooled to room temperature for removing thermal stress in the glasses.…”

Optical properties of amorphous Li2O–WO3–B2O3 thin films deposited by electron beam evaporation

“…Because the non-bridging and the bridging oxygen are bonded to only one and two frames of a network cations, the spectra of the present glass system reveal the presence of W 5+ in addition to W 6+ ions via a weak band region (800-1000 nm). This broad visible band is assumed to be due to the excitation of the W 5+ ion from the ground state with the crystal-field parameters [31]. Davis and Mott [32], Tauc and Menth [33] related these data to the optical band gap, E opt , through the following general relationship proposed for amorphous materials…”