Results 201 to 210 of about 386,126 (244)
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Solid State Communications, 1990
Abstract We have measured, by ERA, the hydrogen diffusion constant DH at 400°C in five undoped aSi:H/cSi thin films. The deposition temperatures of these films were successively 50, 100, 150, 200 and 250°C so that the corresponding nominal H-concentrations were ranging from 18 to 11 at .
X.-M. Tang, J. Weber, Y. Baer, F. Finger
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Abstract We have measured, by ERA, the hydrogen diffusion constant DH at 400°C in five undoped aSi:H/cSi thin films. The deposition temperatures of these films were successively 50, 100, 150, 200 and 250°C so that the corresponding nominal H-concentrations were ranging from 18 to 11 at .
X.-M. Tang, J. Weber, Y. Baer, F. Finger
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?Uphill? hydrogen diffusion effects and hydrogen diffusion coefficients in palladium
International Journal of Hydrogen Energy, 1997Information 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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Materials Testing, 2001
This research focused on the development of a diffusible hydrogen sensor for steel welds. The sensor is based on the chemochromic reaction of WO 3 with hydrogen. The sensor is inexpensive, produces results quickly and has been shown to correlate with hydrogen concentrations derived using the standard gas chromatography method.
Rodney D. Smith Ii +4 more
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This research focused on the development of a diffusible hydrogen sensor for steel welds. The sensor is based on the chemochromic reaction of WO 3 with hydrogen. The sensor is inexpensive, produces results quickly and has been shown to correlate with hydrogen concentrations derived using the standard gas chromatography method.
Rodney D. Smith Ii +4 more
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MRS Proceedings, 1990
ABSTRACTIn order to improve our understanding of the motion of hydrogen and the mechanism by which structural changes occurr, two sets of a-SiC:H samples obtained by glow-discharge at different substrate temperatures and power densities, respectively without and with hydrogen flow, were analyzed.Results from structural, optical and electrical ...
F. DEMICHELIS +3 more
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ABSTRACTIn order to improve our understanding of the motion of hydrogen and the mechanism by which structural changes occurr, two sets of a-SiC:H samples obtained by glow-discharge at different substrate temperatures and power densities, respectively without and with hydrogen flow, were analyzed.Results from structural, optical and electrical ...
F. DEMICHELIS +3 more
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Visualization of Diffusive Hydrogen
Materials Science Forum, 2010In recent years, the use of hydrogen as a clean energy has been paid attention to in terms of the prevention of global warming. Tanks composed solely of steel and cylinders consisting of aluminum liner reinforced with C-FRP in the surrounding are used to store high-pressure hydrogen gas in hydrogen stations and in fuel cell vehicles, respectively.
Takahito Watakabe +2 more
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Diffusion of hydrogen in metals
Advances in Physics, 1985Abstract The present status of our understanding of the diffusion of hydrogen in metals, both experimental and theoretical, is reviewed. Discussions are focused on the mechanism of diffusion of hydrogen isotopes H, D and T in f.c.c. and b.c.c. metals; the positive muon (μ +) is referred to where appropriate.
Y. Fukai, H. Sugimoto
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Journal of Alloys and Compounds, 1998
Abstract The short-range and long-range diffusion of hydrogen in Dy2Fe17 was investigated by magnetic after-effect (MAE) and thermal desorption spectroscopy (TDS) measurements, respectively. After charging the powder samples in a high-purity H2 atmosphere (15 MPa, 293 K) for 3 days, their hydrogen content was determined by TDS to be Dy2Fe17H0.06 ...
N. Mommer +3 more
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Abstract The short-range and long-range diffusion of hydrogen in Dy2Fe17 was investigated by magnetic after-effect (MAE) and thermal desorption spectroscopy (TDS) measurements, respectively. After charging the powder samples in a high-purity H2 atmosphere (15 MPa, 293 K) for 3 days, their hydrogen content was determined by TDS to be Dy2Fe17H0.06 ...
N. Mommer +3 more
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Diffusion of hydrogen in metals
Journal of the Less Common Metals, 1984Abstract The investigation of the diffusion of hydrogen (muons or hydrogen, deuterium or tritium atoms) in metals is aimed on the one hand at understanding the nature of the elementary diffusive step. The extremely large isotope range and the position midway between classical and quantum mechanical transport allows the experimental and theoretical ...
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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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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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