Impedance spectroscopy and dielectric relaxation in alkali tungsten borate glasses

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

“…As a consequence, interesting changes in the luminescent characteristics of lasing ions is expected. The addition of ZnF 2 to tellurite glass matrix is anticipated to contribute to the chemical inertness of the glasses since there is a possibility for the formation of covalent bonding between tellurite and zinc ions through non-bridging oxygens (Te-O-Zn) [14,15].…”

Influence of WO3 on some physical properties of MO–Sb2O3–B2O3 (M=Ca, Pb and Zn) glass system

“…Tungsten ions are expected to have profound influence on physical properties of antimony borate glasses, for the simple reason that the tungsten ions exist in different valance states viz., W 6+ , W 5+ and also in W 4+ state, regardless of the oxidation state of the tungsten ion in the starting glass batch [6][7][8][9][10] as per the following thermo reversible disproportionate reaction:…”

Dielectric, electrical and spectroscopic properties of barium borates of low WO3 content

“…Sodium tungsten borate glasses containing up 37 mol% WO 3 showed an increase in density, refractive index, thermal expansion coefficient, and electrical conductivity [15]. Several studies have been carried out on the spectroscopic, thermal, density and structure properties of high WO 3 containing borate glasses [12,19,20] yet few studies have been carried out on the dc electrical conductivity [21]. The dielectric and optical properties of Zn-borate glasses containing 0.2-2.5 mol% WO 3 have been studied [6].…”