Abstract
Single crystals of H3PW12O40·28H2O, H3PW12O40·21H2O and H4SiW12O40·28H2O have been prepared. The proton diffusion coefficients and conductivities have been determined for the pure protonic as for partially deuterated samples. The numbers are found to be lower than reported in the literature, the Nernst-Einstein relationship is fulfilled and there is almost no isotopic effect. The results indicate the vehicle-mechanism as the operating proton conduction mechanism instead of the Grotthuss mechanism as frequently suggested.
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