Sheoran, A. and Agarwal, A. and Sanghi, S. and Seth, V. P. and Gupta, S. K. and Arora, M. (2011) Effect of WO3 on EPR, structure and electrical conductivity of vanadyl doped WO3 Á M2O Á B2O3 (M1⁄4 Li, Na) glasses. Physica B: Condensed Matter, 406 (23). pp. 4505-4511. ISSN 0921-4526

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Abstract

Glasses with composition xWO3·(30−x)M2O·70B2O3 (M=Li, Na; 0≤x≤15) doped with 2 mol% V2O5 have been prepared using the melt–quench technique. The electron paramagnetic resonance spectra have been recorded in X-band (ν≈9.14 GHz) at room temperature (RT). The spin Hamiltonian parameters, dipolar hyperfine coupling parameter and Fermi contact interaction parameter have been calculated. It is observed that the resultant resonance spectra contain hyperfine structures (hfs) only due to V4+ ions, which exist as VO2+ ions in octahedral coordination with a tetragonal compression in the present glass system. The tetragonality increases with WO3:M2O ratio and also there is an expansion of 3dxy orbit of unpaired electron in the vanadium ion. The study of IR transmission spectra over a range 400–4000 cm−1 depicts the presence of WO6 group. The DC conductivity (σ) has been measured in the temperature range 423–623 K and is found to be predominantly ionic.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier B.V.
Uncontrolled Keywords:	Oxide glasses; Electron paramagnetic resonance (EPR); FTIR spectroscopy; Electrical conductivity
Subjects:	Applied Physics/Condensed Matter Physics
Divisions:	UNSPECIFIED
Depositing User:	Mr. Abhishek Yadav
Date Deposited:	18 Dec 2012 07:47
Last Modified:	18 Dec 2012 07:47
URI:	http://npl.csircentral.net/id/eprint/873

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