Anomalous conductivity and other properties of V2O5-P2O5 glasses with Bi2O3 OR Sb2O3

Ghosh, Aswini ; Chaudhuri, B. K. (1988) Anomalous conductivity and other properties of V2O5-P2O5 glasses with Bi2O3 OR Sb2O3 Journal of Non-Crystalline Solids, 103 (1). pp. 83-92. ISSN 0022-3093

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To characterize the V2O5-P2O5 glasses with Bi2O3 or Sb2O3, the DC and AC conductivities, dielectric constants, SEM, X-ray diffraction, and DTA studies have been made. Electrical properties have been measured in the temperature range 80-420 K and in the frequency range 0.1-100 kHz. The DC conductivity of the 50V2O5(50-x)P2O5-xBi2O3 (x=5-40 mol%) glasses is found to be always higher than that of the pure base glass 50V2O5-P2O5, while the DC conductivity of the 50V2O5 -(50-x)P2O5-xSb2O3 glasses is always lower than that of the base glass. Above 200 K the activation energy of the V2O5-P2O 5-Bi2O3 glasses depends on the concentration of Bi2O3, while that of the V2O5-P2O5Sb2O3 glasses is almost independent of Sb2O3 concentration. However, both of these glasses show an interesting conductivity minimum for about 25-30 mol% of Bi2O3 or Sb2O3. This behavior was not found earlier in any such transition metal oxide glasses. The anomalous behavior, also observed in the concentration (Bi2O3 or Sb 2O3) dependence of the density, glass transition temperature Tg, AC conductivity, and dialectric constant data, is found to be associated with the lowest value of the ratio V5+/V4+ occurring at ~ 25-30 mol% of Bi 2O3 or Sb2O3. The AC conductivity is found to be proportional to ωs, where ω is the frequency and s lying between 0.85 and 0.98, obtained from the theory based on the hopping-over barrier (HOB) model.

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