Abstract
Abstract The properties of the individual diffusion coefficients of the interdiffusing hydrogen and alkali ions in glasses, leached in water, are investigated by model calculations. The applied criterion is that the theoretical resistivity curve must be consistent with Wikby's observations that in the reacted glass a thin region of high resistivity exist whereas the resistivity in the outer surface layer is a fraction of the bulk resistivity. A concentration dependence of only the diffusion coefficient of the sodium ions, simulating a mixed-alkali effect passing to a gel-layer effect, suffices to fulfil this criterion as well as to give a concentration profile which is consistent with experimental concentration profiles.
Published Version
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