Journal of Materials Science

, Volume 30, Issue 20, pp 5139–5145 | Cite as

Non-adiabatic polaron hopping conduction in semiconducting V2O5-Bi2O3 oxide glasses doped with BaTiO3

  • S. Chakraborty
  • M. Sadhukhan
  • D. K. Modak
  • B. K. Chaudhuri


BaTiO3-doped (5–40 wt %) 90V2O5-10Bi2O3 (VB) glasses have been prepared by a quick quenching technique. The d.c. electrical conductivities, σd.c., of these glasses have been reported in the temperature range 80–450 K. The electrical conductivity of these glasses, which arises due to the presence of V4+ and V5+ ions, has been analysed in the light of the small-polaron hopping conduction mechanism. The adiabatic hopping conduction valid for the undoped VB glasses (with 80–95 mol % V2O5), in the high-temperature region, is changed to a non-adiabatic hopping mechanism in the BaTiO3-doped VB glasses. At lower temperatures, however, a variable range hopping (VRH) mechanism dominates the conduction mechanism in both the glass systems. Such a change-over from adiabatic to non-adiabatic conduction mechanism is a new feature in transition metal oxide glasses. Various parameters, such as density of states at the Fermi level N(EF), electron wave-function decay constant, α, polaron radius, rp, and its effective mass, m p * , etc., have been obtained for all the glass samples from a critical analysis of the electrical conductivity data satisfying the theory of polaron hopping conduction.


Electrical Conductivity BaTiO3 V2O5 Decay Constant Glass Sample 
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Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • S. Chakraborty
    • 1
  • M. Sadhukhan
    • 1
  • D. K. Modak
    • 1
  • B. K. Chaudhuri
    • 1
  1. 1.Solid State Physics Department, Glass and Ceramic SectionIndian Association for the Cultivation of ScienceCalcuttaIndia

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