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- W2045273799 abstract "A disordered system is described by a model in which interstitials can occupy sites of different energy. Tracer diffusion occurs in the absence of a concentration gradient and by jumps over energy barriers with the same saddle point energy. Using statistical mechanics and simple random walk considerations the tracer diffusion coefficient is D∗ = γ0D0 where D0 is the known or unknown tracer diffusion coefficient of an arbitrary reference state, and γ0 is the activity coefficient with respect to the same reference state. The activity coefficient γ0 can be calculated for a given energy distribution. The results are in agreement with rigorous treatments of diffusion for the same potential trace. It is shown that Henry's law (γ0 → constant for c → 0) is valid for small interstitial concentrations c and for all types of energy distributions. Thus the diffusivity also becomes independent of concentration for c → 0. Measurements of the hydrogen diffusion coefficient in liquid-quenched and vapour-quenched Pd80Si20 and its dependence upon temperature and hydrogen concentration are presented. These are in excellent agreement with the model if a Guassian distribution of energies is assumed. The width of the energy distribution is different for the two materials, but in each case agrees with results from solubility measurements. For alkali ions in oxide glasses two energy levels, one for sites adjacent to the immobile anions and one for sites far away from them, describes the so-called “weak electrolyte behaviour”, which determines diffusivity and conductivity at low alkali contents. With increasing alkali content the energy distribution changes, and predictions were made, which are in agreement with experimental findings in borate-silicate and GeO2-glasses." @default.
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- W2045273799 date "1985-04-01" @default.
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- W2045273799 title "Modelling tracer diffusion and mobility of interstitials in disordered materials" @default.
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- W2045273799 doi "https://doi.org/10.1016/0022-3093(85)90104-8" @default.
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