Complex dielectric permittivity measurements were performed, at frequencies of between 1MHz and 10GHz, on a β-Na0.33V2O5 bronze which had been prepared by using a sol-gel process. Nuclear magnetic resonance and electron paramagnetic resonance studies of monocrystals, which had been prepared by using a solid-state reaction, revealed the occurrence of 2 types of motion. Thus, Na+ ions jumped with a characteristic time of 5 x 10-12s and an activation energy of 0.12eV, while electrons hopped via lattice distortion with a characteristic time of 10-11s and an activation energy of 0.05eV.

J.C.Badot, N.Baffier, A.Fourrier-Lamer: Journal of Non-Crystalline Solids, 1991, 131-133, 1227-9