Abstract
The conductivity of xFe 2O 3·(60− x)BaO·40B 2O 3 glasses can be described using Mott's models for the small polaron hopping and variable-range hopping processes. The change of resistivity and activation energy with composition indicates that the conduction process varies from ionic to polaronic one. The activation energy is the predominant parameter that affects the conductivity with composition. The calculated values of the conductivity parameters indicate that the conduction mechanism is adiabatic in nature. The change in both the density and molar volume was discussed in terms of the structural modifications that take place in the glass matrix upon replacing BaO by Fe 2O 3.
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