Hopping conductivity in V2O5-P2O5 glasses: Experiment and non-constant force field molecular dynamics

Glasses in xV(2)O(5)-(100-x)P2O5 system within x range from 35 to 95 mol% are obtained by a melt-quenching method and characterized by X-ray powder diffraction, atomic emission spectroscopy and red-ox titration. The dependences of density and molar volume of glasses on V2O5 concentration are linear up to 90 mol% of vanadium oxide and can be expressed via formulas: rho = 2.64 + 0.36.xV(2)O(5) g cm(-1) and V-mol/ = 54.17 + 6.36.xV(2)O(5) cm(3) mol(-)(1). The electronic conductivity of glasses is measured by both impedance spectroscopy and direct current methods. The glass composition of 95V(2)O(5)center dot 5P(2)O(5) shows the highest electrical conductivity value of similar to 1.0 x 10(-4) S cm(-1) at 50 degrees C. The concentration dependence of the conductivity is described at a qualitative level with non-constant force field molecular dynamics.