D.c. conductivity of V2O5–MnO–TeO2 glasses

TLDR: In this article, the Seebeck coefficient measurements at temperatures from 375-475 K indicated the glasses to be n-type semiconducting, and the d.c. conduction was confirmed to obey the small polaron hopping model, and was due to mainly hopping between V-ions in the glasses.

Abstract: Semiconductive oxide glasses in the system V2O5–MnO–TeO2 were prepared, and the mechanism of d.c. conduction was studied. The Seebeck coefficient measurements at temperatures from 375–475 K indicated the glasses to be n-type semiconducting. The d.c. conductivity ranged from 5×10−5 to 1.9×10−6 S cm−1 at 405 K for V2O5=60 mol% and MnO=0–20 mol%, and decreased with increasing MnO content. The conduction was confirmed to obey the adiabatic small polaron hopping model, and was due to mainly hopping between V-ions in the glasses. The polaron band width J was estimated to be J=0.10–0.20 eV. The electron–phonon interaction coefficient γp was very large (21–26). The hopping mobility evaluated as 2.3×10−7–2.7×10−6 cm2 V−1 s−1 increased with increasing V2O5 content. The estimated carrier concentration was the order of 1019 cm−3. The principal factor determining conductivity was the polaron hopping mobility in these glasses. © 1998 Chapman & Hall