Electrical conductivity of molybdenum phosphate (MoO₃:P₂O₅) glasses

The dc conductivity of molybdenum phosphate glasses with the batch composition [(MoO₃)_z(P₂O₅)_z-1] where z = 0.55, 0.60, 0.65, 0.70, and 0.75 has been studied, the non-linearity of the Arrhenius plot (In(σ) versus T^-1) may be due to processes involving several similar activation energies, conduction by small polarons, or variable range hopping of carriers. The electrical conductivity results for these glasses have been discussed by applying the two models suggested by Meunier et al. and it has been found that the use of the small polaron model yields physically plausible values for W_H and W_D within experimental error.