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- W82102920 abstract "The diffusion of iron and cobalt in silver single crystals was studied with the lathe-sectioning technique. The deposited layer of iron (Fe/sup 59/) or cobalt (Co/sup 60/) on the surface of silver specimens was within one atomic layer in thickness. With this small amount of the diffusing element, it was observed that the anomaly near the surface became negligible and the concentration-depth curves were almost normal throughout the whole range of the penetration depths. It was observed that the diffusion coefficient at a given temperature showed a dependence on the diffusion time which never occurs in usual cases. In order to explain these results it was assumed that the anomaly near the surface is due to the impermeability of solute with concentrations above its solubility limit. It was also assumed that in this case the anomaly is very small and disappears at an early stage of the diffusion process because of the small amount of the diffusing element. Then the concentration profile may be almost normal but may not give the correct diffusion coefficient because of the effect of the initial impermeability, as observed. The diffusion now takes place under the condition where the solute is perfectly soluble and hencemore » it can be described by a single diffusion coefficient D throughout the whole range of depth. In this situation the concentration can be reduced to a usual form, with the apparent diffusion coefficient D/sub app/ which is related to the true coefficient D as follows: D/sub app/, = D (1 + const/t), where t is the diffusion time. The present experimental result shows that the above relation is satisfied fairly well and that reasonable values can be obtained for the activation energy and frequency factor. (JAIF)« less" @default.
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- W82102920 date "1963-01-01" @default.
- W82102920 modified "2023-10-18" @default.
- W82102920 title "DIFFUSION OF SOLUTE WITH LOW SOLUBILITY" @default.
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