Effect of Fe ions on electrical conductivity and ESR in tellurium-vanadate glasses

Abstract

Measurements of DC electrical conductivity and ESR were made on 35TeO2-(65-x)V2O5-xFe2O3(mol%) glasses. They suggest that when x is changed from 0 to 1, the conductivity increases due to a decrease in effective electron hopping distance between the transition metal ions. When x is increased to greater than unity, the conductivity decreases because hopping is inhibited due to formation of Fe-O-Fe and Fe-O and Fe-O-V bridge bonds. The conductivity has a distinct maximum at x=1.