Electrical properties (dc and ac) of vanadium-borate glass

The results of an investigation into the temperature and frequency dependence of the electrical conductivity dc and ac (10²–10⁵ Hz)] of glass of the composition 35% B₂O₃-15% CaO-20% V₂O₄-30% V₂O₅ (weight %) are discussed. The resistivity of the glass at T=300°K is =1.2·10¹¹ ·cm. The activation energy of the dc conductivity is E=(0.652±0.004) eV and equal to E for ₂ at high temperatures. The temperature-frequency dependences of the polarization component _p, the dielectric loss coefficient, and the permittivity are explained on the basis of the Fröhlich model proposed for uncoupled relaxation oscillators for which the heights of the potential barriers are uniformly distributed in some range of energies.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika. No. 3, pp. 35–38, March, 1981.