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Effect of annealing on d.c. conductivity of V2O5-SnO-TeO2 glasses

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Abstract

The d.c. conductivity (σ) of V2O5-SnO-TeO2 glasses prepared by the press-quenching method was studied at temperatures from room temperature (RT) to 473 K, and the effect of annealing on σ was investigated. The conductivity of 50V2O5·20SnO·30TeO2 glass was determined to be 3.98×10−4 Scm−1 at 473 K and was unchanged for annealing (6–48 h) at 493 K, lower than Tg = 501 K, while its density increased with annealing time. These glasses were found to be n-type semiconductors, and the conduction was confirmed to be due to adiabatic small polaron hopping for V2O5 ≧ 50 mol%, and non-adiabatic for V2O5 < 50 mol%. The activation energy for conduction, W, decreased with annealing time. Variations in oxygen molar volume of the glasses with annealing time inferred a change in glass structure, from loosely to closely packed, resulting in a decrease in vanadium ion spacing with annealing. This caused an increase in the polaron band width, producing a decrease in polaron hopping energy and W. The effect of annealing time on the density of 50V2O5·20SnO·30TeO2 glass was explained adequately by Winter's formula.

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Authors and Affiliations

  1. Department of Applied Chemistry, Tokai University, 1117, Kitakaname, Hiratsuka, 259-12, Kanagawa, Japan

    Hidetsugu Mori & Hironobu Sakata

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  1. Hidetsugu Mori
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  2. Hironobu Sakata
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Mori, H., Sakata, H. Effect of annealing on d.c. conductivity of V2O5-SnO-TeO2 glasses. JOURNAL OF MATERIALS SCIENCE 30, 4389–4393 (1995). https://doi.org/10.1007/BF00361522

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  • DOI: https://doi.org/10.1007/BF00361522

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