Results 201 to 210 of about 195,760 (256)

Hydrogen diffusion in α-Fe2O3: Implication for an effective hydrogen diffusion barrier

International Journal of Hydrogen Energy, 2020
Abstract Hydrogen diffusion plays a key role in hydrogen embrittlement which leads to the failure of metals. In the present work, hydrogen diffusions in Fe and α-Fe2O3 were studied by first-principles calculations. The results show the energy barrier of hydrogen diffusion in pure Fe is small and hydrogen atom has a high diffusivity at ambient ...

exaly   +2 more sources

Diffusion of Hydrogen in Niobium

Physical Review Letters, 1988
The diffusion rate of H and D in Nb is calculated with avoidance of the usual adiabatic, linear-coupling, and Condon approximations. The method employed is a generalization of the standard small-polaron theory with explicit account taken of the coupled interstitial-host vibrations.
, Schober, , Stoneham
openaire   +2 more sources

Hydrogen chemical potentials and diffusion coefficients in hydrogen diffusion membranes

Nature, 1983
Palladium and palladium alloys are quite widely used as membranes for hydrogen permeation, because of their resistance to embrittlement and to irreversible deformations during cycles of absorption and desorption of hydrogen1–3. The isothermal relationships between hydrogen diffusion coefficient, DH, and hydrogen content, n (ratio of hydrogen/metal ...
F. A. Lewis   +3 more
openaire   +1 more source

Diffusion of hydrogen in BCC metals

Scripta Metallurgica, 1985
On reexamine la diffusion de l'hydrogene dans la direction dans la theorie classique en utilisant un modele ou les atomes d'hydrogene migrent a travers les deux parcours alternatifs de sequences de sites T-T et T-O-T dans le but de savoir jusqu'a quel point un modele peut expliquer les aspects generaux de la diffusion de l'hydrogene dans les cristaux
Y. Sakamoto, K. Baba, T. Suehiro
openaire   +1 more source

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