FTIR spectra and some optical properties of tungstate-tellurite glasses

• Published in: The Journal of physics and chemistry of solids 1996-09, Vol.57 (9), p.1223-1230
• Main Authors: Shaltout, I., Tang, Yi, Braunstein, R., Shaisha, E.E.
• Format: Article
• Language: English
• Subjects: A. glass; C. infrared spectroscopy; Condensed matter: electronic structure, electrical, magnetic, and optical properties; D. optical properties; Disordered solids; Exact sciences and technology; Infrared and raman spectra and scattering; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Physics
• ISSN: 0022-3697; 1879-2553
• DOI: 10.1016/0022-3697(95)00309-6

The optical properties of the binary glass system {(100 − x) TeO 2 + xWO 3} with 5 ≤ x ≤ 50 mol % was studied using Fourier transform infrared spectroscopy in the spectral range 150–25,000 cm −1. The color of these glasses changes from yellow to light green, to dark green as WO 3 concentration increases. These glasses are disordered versions of tetragonal TeO 2 of D 2 4 symmetry where the Te atom is 4-fold coordinated. The W ion coordination states change from 4 to 6 when WO 3 increases beyond 31.5 mol %. The band tail energies are found to be between 0.103 and 0.112 eV, however these values do not show a monotonic behavior as WO 3 concentration increases. The optical band gap ( E opt) was found to decrease from 3 to 2.93 eV as WO 3 increases from 15 to 30 mol % while the refractive index ( N) as a function of WO 3 was found to change from 2.27 to 2.36 as WO 3 concentration increases from 15 to 30 mol.