Niob und Wasserstoff, Niob und Deuterium

Sieverts, A.; Moritz, H.

doi:10.1002/zaac.19412470110

Cited by 34 publications

(9 citation statements)

References 7 publications

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“…Their results are conapared with those of Sieverts and Moritz (8) and of this study in Table 3. It is seen that solubilities of Paxton and Sheehan below 600 C are considerably lower than those of the other studies.…”

Section: Equilibriasupporting

confidence: 80%

Reactions in the Niobium-Hydrogen System

Albrecht

Goode

Mallett

1959

J. Electrochem. Soc.

144

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Equilibria and elevated‐temperature x‐ray studies show that a solid solution of hydrogen in niobium is produced throughout most of the system. A miscibility gap was found at low temperatures and pressures with a critical point at about 140°C, 0.01 mm of mercury hydrogen pressure, and 0.3 H/Nb. Sorption rates at 300°–550°C were initially linear. At higher temperatures, sorption rates were controlled by diffusion in the metal matrix. Diffusion coefficients at 600°–700°C can be expressed by: D=0.0215exp][)(−9370±600/RT Desorption rates were slower than those predicted by diffusion.

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Section: Equilibriasupporting

confidence: 80%

Reactions in the Niobium-Hydrogen System

Albrecht

Goode

Mallett

1959

J. Electrochem. Soc.

144

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“…Values for hydrogen solubility in niobium at pressure of 1 atm were recently reported by Paxton and Sheehan (2). Their results are conapared with those of Sieverts and Moritz (8) and of this study in Table 3. It is seen that solubilities of Paxton and Sheehan below 600 C are considerably lower than those of the other studies.…”

Section: Equilibriasupporting

confidence: 80%

“…where E is approximately equal to the activation energy, m is the mass of the solute atom, and X is the distance between the interstitial positions {X = ao/2). From Equations (7) and (8), AS for diffusion of hydrogen in niobium was calculated to be 3. 8 cal/(g-atom)(C).…”

Section: Sorption Kinetics and Diffusionmentioning

confidence: 99%

Reactions in the Niobium-Hydrogen System

Albrecht¹,

Goode²,

Mallett³

1959

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Equilibria in the niobium-hydrogen system were determined in the range 100 to 900 C, 0.1 to 1000 mm of mercury hydrogen pressure, and hydrogen/niobium atomic ratios of 0.01 to 0.85. X-ray measurements were obtained at 25 to 400 C at hydrogen/niobium ratios up to 0.54. The studies showed that a solid solution of hydrogen in niobium is produced throughout most of the system. A miscibility gap was foundat low temperatures and pressures, with a critical point at about a temperature of 140 C, a hydrogen pressure of 0.01 mm of mercury, and a hydrogen/niobium ratio of 0.3. Sorption rates at 300 to 550 C were initially linear. At higher temperatures, sorption rates were controlled by diffusion in the metal matrix. Diffusion coefficients at 600 to 700 C can be expressed by D '^-0.0215 exp [(-9370 ± 600)/RT \. Desorption rates were lower than those predicted by diffusion.

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“…Experimental data on hydrogen solubility in metal have been reported. − The experimental data under hydrogen pressure of 0.1 MPa are fitted by eqs , , , , and as shown in Figures − . The metal-hydrogen phase diagrams for α, α′, β, γ, δ, and ϵ phases are also plotted .…”

Section: Resultsmentioning

confidence: 99%

A Statistical−Mechanical Method to Evaluate Hydrogen Solubility in Metal

Ogawa

2010

J. Phys. Chem. C

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We propose a site-occupying model (SOM) to evaluate hydrogen solubility in metal because there is a discrepancy between the concept of the site-blocking model and experimental fact, as shown in this work. SOM is based on the experimental fact that hydrogen atoms in metal cannot come closer to each other than about 0.21 nm under hydrogen pressure of 1 MPa or less. We evaluate the hydrogen solubility by developing a statistical-mechanical method which considers partition functions for translational motion, configuration, vibration, rotation, and spin weights. SOM is verified by agreement with experimental data on hydrogen solubility in metal. We also compare SOM with the site-blocking model, and find that the theoretical curves from SOM agree well with the experimental data even at high hydrogen solubility of over 0.5 H/M by atomic ratio (hydrogen/metal).

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Niob und Wasserstoff, Niob und Deuterium

Abstract: Die Löslichkeiten von Wasserstoff und von Deuterium in metallischem Niob wurden bei Atmosphärendruck bis 900° aufwärts gemessen.

Cited by 34 publications

References 7 publications

Reactions in the Niobium-Hydrogen System

Reactions in the Niobium-Hydrogen System

Reactions in the Niobium-Hydrogen System

A Statistical−Mechanical Method to Evaluate Hydrogen Solubility in Metal

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