Electrical Conductivity of PbO‐P₂O₅‐V₂O₅Glasses

Abstract

The dc conductivities (u) of PbO-PzOs-VzOs glasses contain-ing up to 80 mol% VzOs were measured at T = 100°C to T = 10°C below the glass transition temperature. Dielectric constants at 1 MHz, densities, and the fraction of reduced V ion were measured at room temperature. The conduction mechanism of glasses containing >10 mol% VzOs was considered to be small-polaron hopping, as previously reported for other vanadate glasses. The temperature dependence of u was exponential, with u = ( a o / T ) exp(-W/kT). When the VzOs content was 250 mol%, W decreased and u increased with increasing Vz05 content, and the adiabatic approximation could be applied. In the composition range between 10 and 50 mol% VzOs, u increased with increasing VzOs content, but W varied little. In this region, the hopping conduction was characterized as nonadiabatic. The effect of dielectric constants and V ion spacing on W is discussed.

Investigation of DC Conductivity and Non-Adiabatic Small Polaron Hopping in V2o5-Seo2-Zno Glass Nanocomposites

“…It is hypothetical that vanadium ion modifies the structure of glassy system at such definite temperature. As stated by Hirashima [23] …”

“…where θ D is the characteristic Debye temperature that defined by [23] Based on Schnakenberg's polaron hopping model [24], polaron disordered energy (W D ≠ 0) is described by optical multi phonon hopping process at higher temperature, while at lower temperature, the dc conductivity is influenced by the acoustical single phonon assisted hopping process. The temperature dependent Dc conductivity of this model is expressed by the relation…”

Effect of Sulfur on the Structure and Physical Properties of Vanadium-Iron-Lithium-Silicate Glass and Glass-Ceramics Nano Composite

“…Most probable it is a resultant of two overlapped bands. The first can be attributed to Si-O-Si bending vibration in SiO 4 tetrahedral groups [17,18], while the second one may be due to the presence of some V-O-V linkages between vanadate layers and chains [19]. In the spectra of both glass-ceramic samples, this band may hide a very small one that due to some iron ions occupy FeO 6 groups acting as glass network modifier [20].…”

Synthesis, Crystallization, and Dielectric Behaviour of Lead Bismuth Titanate Borosilicate Glasses with Addition of 1% La2O3

“…The study of various oxide glasses has received considerable attention due to their structural property [3,4]. These glasses have wide application in the field of electronics, nuclear, and solar energy technologies and acoustic-optics device [5][6][7][8][9]. Glass ceramics are formed by controlled crystallization of glasses.…”