Role of WO{sub 3} on DC conductivity and some optical properties of TeO{sub 2} based glasses
- Department of Physics, Osmania University, Hyderabad 500 007 (India)
Graphical abstract: Display Omitted Highlights: ► TeO{sub 2}–GeO{sub 2}–WO{sub 3} glass system was prepared using melt quenching method. ► DC conductivity, FESEM, EDS and optical absorption studies were carried out. ► Non bridging oxygens (NBOs) are increases with increase of WO{sub 3} content. ► Increase in NBOs is responsible for the increase in the refractive index of glasses. ► Two charge transport mechanisms are coexist in these glasses. -- Abstract: DC electrical conductivity and optical absorption studies have been employed to understand the influence of WO{sub 3} content on the electrical and optical properties of the TeO{sub 2}–GeO{sub 2}–WO{sub 3} glass system. Field emission scanning electron microscope (FESEM), Energy dispersive X-ray spectrometry (EDS) measurements have been used to confirm the glassy nature and the elemental analysis of the glass composition, respectively. DC electrical conductivity of the glasses was studied in the temperature range 423–613 K. From Arrhenius plot, the activation energies (E{sub act}) of all the glasses have been calculated and conduction mechanism has been discussed in terms of structural changes occurred with the addition of WO{sub 3} content. The optical properties such as optical band gap (E{sub opt}), Urbach energy (ΔE), molar refraction (R{sub M}), metallization criterion (M), electronic polarizability of the oxide ion (α{sub O{sup 2}{sup −}}) and refractive index (n) have been determined from optical absorption data and were found to be composition dependent.
- OSTI ID:
- 22215620
- Journal Information:
- Materials Research Bulletin, Vol. 47, Issue 11; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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