Diffusion of hydrogen in transition metals
نویسندگان
چکیده
منابع مشابه
Switchable mirrors for visualization and control of hydrogen diffusion in transition metals
We show that the switchable mirror material YHx can be used both as an indicator to monitor and as an agent to control hydrogen diffusion in thin films. The applicability of the optical-indicator technique is demonstrated for VHx thin films. The diffusion coefficient is typically 10 25 cm/s at concentrations around 0.7 H/V at temperatures between 373 and 473 K. Deposition of a layer of Y on V m...
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We have modified the kinetic equations for the absorption of hydrogen in transition metals to include the effects of strong subsurface bonding. The new equations show that the subsurface, self-trapped hydrogen acts as a valve for the admission of hydrogen into the bulk. The explanation for a number of experimental facts, not well understood before, neatly follows. Discrepancies between theory a...
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Heterogeneous catalysis is commonly governed by surface active sites. Yet, areas just below the surface can also influence catalytic activity, for instance, when fragmentation products of catalytic feeds penetrate into catalysts. In particular, H absorbed below the surface is required for certain hydrogenation reactions on metals. Herein, we show that a sufficient concentration of subsurface hy...
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Products of interactions of transition metals with hydrogen exhibit retentions of essential metallic properties accompanied by decreases of density. With reference to temperature and to hydrogen gas-pressures, p, in equilibrium, different metals exhibit very different levels of hydrogen content, c. For elements in subgroups 111, IV and V and palladium in group VIII, initial regions of solid sol...
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ژورنال
عنوان ژورنال: Journal of the Less Common Metals
سال: 1991
ISSN: 0022-5088
DOI: 10.1016/0022-5088(91)90174-3