Electrical conductivity of semiconducting tungsten oxide glasses

The conductivity measurements of 60WO(3)-40B(2)O(3) and 40WO(3)-5Sb(2)O(3)- 55TeO(2) glasses have been carried out as a function of temperature. The re sults suggest that the conduction occurs by hopping of small polarons. Diel ectric measurements of 60WO(3)-40B(2)O(3) glass show that the temperature b ehavior could be described in terms of Debye type dispersion. The oxygen se nsing properties of 40WO(3)-5Sb(2)O(3)-55TeO(2) were also examined. The red uction in its conductivity in oxygen is attributed to the oxidation of W5ions to W6+ ions. A large change in the conductivity of this tellurite base d glass in oxygen suggests that the glass can be used as a potential oxygen gas sensor.