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Advances in Condensed Matter Physics
Volume 2008 (2008), Article ID 937054, 7 pages
http://dx.doi.org/10.1155/2008/937054
Research Article

Structural and Physical Properties of Glasses

1Department of Electronic Science, Kurukshetra University, Kurukshetra 136 119, India
2Department of Applied Physics, S.D. College Ambala Cantt, Kurukshetra University, Ambala Cantt 133 001, India
3Department of Physics, Maharshi Dayanand University, Rohtak 124 001, India

Received 23 May 2008; Revised 13 August 2008; Accepted 22 October 2008

Academic Editor: Gayanath Fernando

Copyright © 2008 Virender Kundu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The structural and physical properties of -(40-x) - glass system have been investigated. The samples were prepared by normal melt-quench technique. The structural changes were inferred by means of FTIR by monitoring the infrared (IR) spectra in the spectral range 600–4000 . The absence of boroxol ring (806 ) in the present glass system suggested that these glasses consist of randomly connected and units. The conversion of to and to tetrahedra along with the formation of non-bridging oxygen's (NBOs) attached to boron and vanadium takes place in the glasses under investigation. The density and molar volume of the present glass system were found to depend on content. DC conductivity of the glass system has been determined in the temperature range 310–500 K. It was found that the general behavior of electrical conductivity was similar for all glass compositions and found to increase with increasing iron content. The parameters such as activation energy, average separation between transition metal ions (TMIs), polaron radius, and so forth have been calculated in adiabatic region and are found consistent with Mott's model of phonon-assisted polaronic hopping.