Influence of different alkaline oxide modifiers on VO2+ ions doped zinc borate glasses
Source abstract
Abstract
Abstract Glassy system of composition 20R2O-19ZnO-60B2O3-1V2O5(R is Li, Na and K) was prepared by conventional melting technique. The measured density ρ and calculated molar volume Vm were both found to increase linearly with the atomic number of the alkali element, reflecting the formation of non-bridging oxygen. Additional physical parameters such as vanadium ions concentration, inter-ionic distance of vanadium ions, polaron radius, field strength, refractive index and electrical susceptibility were calculated. Infrared spectra were recorded, vibrational modes were assigned, and the spectra were deconvoluted to calculate the N4 value. The absorption edge and optical band gap were estimated from UV–Vis absorption spectra, and were found to exhibit a clear R2O mol% dependence. The Spin Hamiltonian parameters were calculated from ESR spectra, and the V4+ ions were found to exist as VO2+ ions in octahedral coordination with tetragonal compression. Furthermore, the Δg||/Δg┴ values were decreased with R2O mol% indicating a reduced tetragonal distortion.
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Research context
OpenAlex topics: Glass properties and applications · Luminescence Properties of Advanced Materials · Phase-change materials and chalcogenides
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