Proton mobility in HxWO3 measured by proton magnetic resonance

An NMR study for a powder sample of H_xWO₃ prepared by the reduction of WO₃ with zinc grains and a dilute HCl is reported and the temperature dependence of the correlation time and the proton mobility estimated from the linewidth of proton magnetic resonance (PMR) is presented. The correlation time can be described by a single exponential line $\text{τ = τ}{}_0\text{exp}\text{(}\text{E}\text{kT}\text{)}$, where τ₀ = 1.1 × 10^-10 sec and E = 0.13 eV. The proton mobility is compared with the one obtained for an amorphous film by bleaching current measurement.