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Electrical Conduction in Borophosphate Glasses Doped With CoO and Li2O

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Author Affiliations

  • 1Department of Physics, Gulbarga University, Gulbarga, Karnataka 585106, INDIA
  • 2 Department of Physics, Proudha Devaraya Institute of Technology, Hospet, Karnataka, INDIA
  • 3 Department of Physics, RYM Engineering College, Bellary, Karanakta, INDIA

Res. J. Material Sci., Volume 3, Issue (4), Pages 1-6, September,16 (2015)

Abstract

Oxide glasses in the compositions, (B0.2 - (P0.3 - (CoO) X - (LiO) 0.5-X, wherex = 0.05, 0.1, 0.15, 0.20, 0.25, 0.30, 0.40 and 0.50 were prepared at 1400K by the standard melt quenching method. The samples were confirmed to be noncrystalline through XRD studies By following Archimedes method, room temperature density was determined. Conductivity was measured for the temperature range from 350K to 625K. Molar volume was estimated using density. Density variation with x indicated that glass structure is sensitive to the changes in CoO content. The conductivity data was analyzed using Mott’s small polaron hopping (SPH) model and activation energy was determined. The nature of change in conductivity and activation energy with CoO variation revealed switchover of conduction mechanism from predominantly ionic to electronic regimes around x=0.3. The conductivity data deviated from Mott’s SPH model has been analyzed using variable range hopping models and density of states at Fermi level has been determined. The polaron hopping related quantities such as transition metal ion density, N, polaron hopping distance, r and polaron radius, r, were determined. For the first time borophosphate glasses doped with LiO and CoO were studied for conductivity variation with temperature and changeover of conduction mechanism from ioni cpredominane regime to electronic regime has been observed.

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