Results 251 to 260 of about 568,795 (292)

?Uphill? hydrogen diffusion effects and hydrogen diffusion coefficients in palladium

International Journal of Hydrogen Energy, 1997
Information concerning measurements of hydrogen diffusion coefficients over α- and β-phase ranges of hydrogen content in the palladium/hydrogen system is summarized. The utilization of palladium as a hydrogen purification membrane has constituted a background for observations of “uphill” hydrogen diffusion effects.
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Diffusion of Hydrogen in Hydrogen-Quenched Nickel

Japanese Journal of Applied Physics, 1977
The recovery process of hydrogen dissolved in excess in nickel is studied by means of the hydrogen-quenching method which is a modified Schultz's method. Two recovery stages of electrical resistance are found. The lower temperature stage is a new one which presumably arises from trapping and/or clustering of hydrogen atoms in the interior of the ...
Kohji Yamakawa, Francisco Eiichi Fujita
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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 ...
Baihui Xing, Jianbin Wu, Jianlin Cheng, Lin Zhang, Min Wu   +4 more
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Diffusible hydrogen

2013
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Diffusion of Hydrogen

2012
This chapter deals with the diffusion properties of hydrogen in zirconium as driven by mass, stress, and thermal gradients. The relevant diffusion equations are derived starting from the phenomenological theory of irreversible thermodynamics. A general expression for the flux of hydrogen in mass (concentration), stress, and temperature gradients is ...
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Hydrogen diffusion in aluminum

Scripta Metallurgica, 1983
Although the diffusivity of hydrogen in aluminum has been measured by several different authors, there is essentially no mutual agreement and the sets of data are separated by orders of magnitude. There is little doubt these mass-flow determinations of the H-diffusivity are subject to great uncertainties connected with the presence of the surface oxide
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Abnormal subsurface hydrogen diffusion behaviors in heterogeneous hydrogenation reactions

The Journal of Chemical Physics, 2018
Hydrogen adsorption and diffusion behaviors on noble metal model catalyst surfaces and into the subsurfaces are of paramount significance in the exploration of novel heterogenous catalytic hydrogenation reactions. We present an in-depth study of hydrogen adsorption on and diffusion into the subsurfaces of three typical 5d noble metals from three ...
Feina Zhai, Yuanjie Li, Yongpeng Yang, Sisi Jiang, Xiangjian Shen   +4 more
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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
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Hydrogen enhanced oxygen diffusion

Physica B: Condensed Matter, 1991
Abstract The diffusion of oxygen impurities in Cz silicon is thought to occur by a single process over the temperature range 350–1250°C. Enhanced oxygen diffusion has been reported for samples which have been subjected to high temperature pre-anneals, deliberate metallic contamination or irradiation by high energy electrons. Recently, enhanced oxygen
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Hydrogen diffusion in Fe4N: Implication for an effective hydrogen diffusion barrier

International Journal of Hydrogen Energy, 2023
Min Wu, Jing Wang, Baihui Xing, Haojie Zhu   +3 more
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