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

Structural and Physical Properties of Fe2O3-B2O3-V2O5 Glasses

Virender Kundu,1 R. L. Dhiman,2 A. S. Maan,3 and D. R. Goyal3

 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

Recommended by Gayanath Fernando

Abstract

The structural and physical properties of xFe2O3-(40-x) B2O3-60V2O5  (0≤x≤20) 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 cm-1. The absence of boroxol ring (806 cm-1) in the present glass system suggested that these glasses consist of randomly connected BO3 and BO4 units. The conversion of BO3 to BO4 and VO5 to VO4 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 Fe2O3 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.