Abstract
THERE has been considerable discussion1,2,3 as to why the rate of diffusion of hydrogen through metals, instead of reaching a limiting constant value, continues to obey a p-law even when the pressure p is several hundred atmospheres. Recently the view was advanced3 that although the pressure outside the metal may be high, owing to a slow rate of transport through the boundary adsorbed layer metal as compared with a rapid diffusion within the metal, there is always only a small concentration just inside the metal, which is built up according to the p-law. If, however, it can be built up sufficiently, the concentration just inside the metal will approach the saturation value, and the p-law can then no longer hold. This condition has previously never been realized.
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References
Smithells, C., “Gases and Metals” (Chapman and Hall., 1937), p. 105.
Wang, J., Proc. Camb. Phil. Soc., 32, 652 (1936).
Barrer, R., Phil. Mag., 28, 353 (1939).
Lombard, Eichner and Albert, Bull. Soc. Chim., 3, 2203 (1936).
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BARRER, R. Diffusion in Palladium. Nature 145, 898 (1940). https://doi.org/10.1038/145898a0
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DOI: https://doi.org/10.1038/145898a0
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