Characterisation of glasses in the TeO2–WO3–PbO system

The structural and spectroscopic investigations of ternary tellurite glasses, doped with copper

“…From this observation we can conclude that Cu 2+ ions are mostly surrounded by NBOs, which may present high electron cloud density at the Cu 2+ site and hence the variations in spin-Hamiltonian parameters as observed. The variations in EPR parameters not only depend exclusively on the above said reasons but also differences in the field intensities of W 6+ ions (1.47), Te 4+ ions (0.71) and Ag + ions (0.60) causes the fluctuations in ligand field around Cu 2+ ions and this in turn vary the spin-Hamiltonian parameters as observed [32].…”

A study on the optical, structural, electrical conductivity and dielectric properties of a lithium bismuth germanium tungsten glasses

“…Also this result is due to the fact that tungsten ions have an intermediate behavior between network formers and modifiers. Thus, depending on the own nature of the other glass components in the three-dimensional structure and on their percentage, they could play the role of formers or modifiers and introduces excess structural free volume [15]. 844 and 935 cm −1 were also observed.…”

Influence of tungsten on the emission features of Nd3+, Sm3+ and Eu3+ ions in ZnF2–WO3–TeO2 glasses

“…The thorough literature survey on TeO 2 glasses as laser host materials, indicates that though some considerable number of studies on WO 3 -TeO 2 glasses are available [37,38], still there is a lot of scope to investigate the influence of the tungsten ions on the emission characteristics of rare earth ions. The objective of the present investigation is to study the fluorescence features of three different rare earth ions viz., Nd 3+ , Eu 3+ and Sm 3+ ions in the visible and infrared regions in ZnF 2 -WO 3 -TeO 2 glass system with the gradual increase of WO 3 content in the glass network at the expense of ZnF 2 .…”