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- W21501634 abstract "The hydrogen uptake rates of clean Nb and Ta foils were measured as a function of temperature and pressure. The sticking coefficient (number of hydrogen atoms entering the bulk / number of hydrogen atoms hitting the surface) of hydrogen on clean Nb and Ta, at approx. = 2.2 x 10/sup -5/ Torr hydrogen and room temperature, was found to be surprisingly low, approx. = 0.005 and approx. = 0.05 respectively, resulting in very low uptake rates under these conditions. This result is explained on the basis of a model recently proposed. It was found that these uptake rates can be significantly enhanced or decreased by the surface deposition of a thin layer of Pd, Pt, or Ni. The hydrogen uptake rates, i.e., sticking coefficients, were measured as a function of the overlayer thickness. In the case of Pd it was found that a layer less than one monolayer thick will either not change or even inhibit the hydrogen uptake, whereas a layer over one monolayer thick will dramatically enhance the sticking coefficient to a value of 1. It was found that the change at one monolayer is related to a phase transition of the Pd surface layer at that coverage.more » Both Pt and Ni do not exhibit this effect but do influence the uptake rate by an amount depending on their thickness. Thick overlayers inhibit uptake due to a limited permeation rate through the layer.« less" @default.
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- W21501634 date "1980-01-01" @default.
- W21501634 modified "2023-09-24" @default.
- W21501634 title "Uptake rates for hydrogen by Nb and Ta; effect of thin metallic overlayers" @default.
- W21501634 hasPublicationYear "1980" @default.
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