The conductivity measurements of 60WO3–40B2O3 and 40WO3–5Sb2O3–55TeO2 glasses have been carried out as a function of temperature. The results suggest that the conduction occurs by hopping of small polarons. Dielectric measurements of 60WO3–40B2O3 glass show that the temperature behavior could be described in terms of Debye type dispersion. The oxygen sensing properties of 40WO3–5Sb2O3–55TeO2 were also examined. The reduction in its conductivity in oxygen is attributed to the oxidation of W5+ ions to W6+ ions. A large change in the conductivity of this tellurite based glass in oxygen suggests that the glass can be used as a potential oxygen gas sensor.
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Tandon et al. (2001) studied this question.
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