Electrical Conduction of Glasses in the System Fe2O3-Sb2O3-TeO2

Fe2O3-Sb2O3-TeO2 glasses were prepared by the pressquenching method and their do conductivities were measured. The glass formation region was found to be 0≤Fe2O3≤15mot%, 0≤Sb2O3≤18mol%, and 78≤TeO2<100mol%. Seebeck coefficient measurements showed that these glasses were n-type semiconductors. The glasses gave conductivities σ ranging from 1.62×10-6 to 1.86×10-7 S·cm-1 at 473K. The dc conductivity increased with an increase in Fe2O3 content. Evaluated carrier mobility and concentration ranged from 7.5×10-10 to 5.3×10-3cm2·V-1·s-1 and from 1.5×1021 to 1.9×1015cm-3 at 473K, respectively. The conduction of these glasses was due to non-adiabatic small polaron hopping.