| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1515781 | Journal of Physics and Chemistry of Solids | 2015 | 8 Pages |
•A series of Na2O–PbO–Al2O3–B2O3: WO3 glasses are synthesized by melt quenching process.•A variety of spectroscopic properties of tungsten ion mixed glasses are investigated.•EPR spectra indicate that the W5+ ions present in axially distorted octahedral symmetry.•The FT-IR spectral studies reveal the existence of conventional BO3, BO4, B-O-B, PbO4, WO4 & WO6 structural units of these glasses.
Na2O–PbO–Al2O3–B2O3 (NPAB) glasses mixed with different concentrations of WO3 (ranging from 0 to 2.5 mol%) are synthesized by conventional melt quenching method. The samples are characterized by X-ray diffraction (XRD), optical absorption, Electron paramagnetic resonance (EPR) and Fourier transform infrared (FT-IR) spectroscopic techniques. Glass formation is confirmed by X-ray diffraction spectra. The optical absorption spectra of these glasses exhibited a predominant broad band peak at about 850–870 nm is identified due to dxy–dx2−y2 transition of W5+ ions. From the optical absorption spectral data, optical band gap (Eopt) and Urbach energy (ΔE) are evaluated. From EPR spectra the strength of the signal is increased and hyperfine splitting is resolved with increasing concentration of WO3 in the glass matrix. The FT-IR spectral studies have pointed out the existence of conventional BO3, BO4, B–O–B, PbO4, WO4 and WO6 structural units of these glasses. Various physical properties and optical basicity are also evaluated with respect to the concentration of WO3 ions.
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