The effect of surface contamination on the measured hydrogen solubilities of metals

Kiuchi, Kiyoshi; McLellan, Rex B.

doi:10.1016/0022-5088(83)90522-2

Cited by 14 publications

(4 citation statements)

References 37 publications

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“…For the FCC phase we expect hydrogen to occupy the octahedral sites, so that /3 = 1. There is much data on the hydrogen absorption of nickel (see [8] for a summary up to 1983), which especially at higher temperatures are consistent with each other, as can be seen in figure 3. For the low-temperature region (below 600 "C) the data of McLellan and Sutter [45] are probably more reliable as they pertain to electropolished samples.…”

Section: Cobalt Nickel and Molybdenum (Figure 3)supporting

confidence: 66%

“…There is a special difficulty involved with solubility data belowx = 0.001, where systematic errors can easily occur because of trapping at grain boundaries, voids or impurities (in particular oxygen), or errors due to adsorption at surfaces. Kiuchi and McLellan performed an extensive study of possible sources of discrepancy in the data of Ni, CO, Pt [8] and, in great detail, Fe [32]. They concluded that either only data above 600 "C can be trusted, or, at lower temperatures, one should be sure to deal with very clean surfaces of the absorbing material.…”

Section: Determination Of the Standard Molar Heat Of Formation Of Sommentioning

confidence: 99%

“…Nickel is probably the best studied high-pressure hydride. Within the context of highpressure synthesis of metal hydrides it can be considered as a model system: easily accessible by high-pressure techniques [ 11, 56,60,61], no phase transition during hydride formation (both phases FCC), and reliable absorption data at low pressure [8]. Nickel hydride can be produced chemically or electrolytically, and is slow to decompose at room temperature.…”

Section: Nickelmentioning

confidence: 99%

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Metal hydride formation at pressures up to 1 Mbar

Driessen

Sanger

Hemmes

et al. 1990

J. Phys.: Condens. Matter

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which at low hydrogen pressures absorb only small amounts of hydrogen. It is shown that with thermodynamic parameters determined from low-pressure data only (the molar standard heat of formation AH! and the Einstein temperature OE of the interstitial hydrogen vibration) it is also possible to describe their high-pressure behaviour. As a result, the pressure-composition isotherms of these 14 metals are given for several temperatures and for pressures up to 1 Mbar. Where possible, comparison is made with experimental data.

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Section: Cobalt Nickel and Molybdenum (Figure 3)supporting

confidence: 66%

Section: Determination Of the Standard Molar Heat Of Formation Of Sommentioning

confidence: 99%

Section: Nickelmentioning

confidence: 99%

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Metal hydride formation at pressures up to 1 Mbar

Driessen

Sanger

Hemmes

et al. 1990

J. Phys.: Condens. Matter

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“…2. where u = hv 0 /kT and x = hc/(2n) 2 16 Kmv 0 . The simplest approximation to the frequency v obtainable from Q, the activation energy for diffusion is given by [23] \2m Y /2 I (9) where d is the jump distance and m is the mass of H. Taking d as the octahedral-octahedral distance and using the value of Q given by Völkl and Alefeld [14] (Q = 0.41 e.V = 39.42 kJ/mol), formula (9) yields the value v = 2 .…”

Section: μ\ = R\ -τέγ = \ Hv + 3kt Ln(l -E" Av/ * R ) (7)mentioning

confidence: 99%

Thermodynamics of the Hydrogen–nickel System

McLellan¹,

SUTTER²

1986

Perspectives in Hydrogen in Metals

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Careful measurements of the hydrogen solubility at atmospheric pressure in nickel in equilibrium with H 2 -gas have confirmed previous observations that the partial thermodynamic functions of H in Ni exhibit a strong temperature dependence. This effect, rendered visible by the large range of reciprocal temperature spanned by the data, is not due to interactions between dissolved H-atoms and lattice imperfections, but simply to the thermal excitation of the quantum energy levels of the dissolved H-atoms which may be approximated to harmonic oscillators.Résumé-Des mesures soignées de la solubilité de l'hydrogène à la pression atmosphérique dans le nickel en équilibre avec de l'hydrogène gazeux ont confirmé des observations antérieures selon lesquelles les fonctions thermodynamiques partielles de 1Ή dans le Ni varient fortement avec la température. Cet effet, rendu visible par la large gamme de l'inverse de la température balayée par les expériences, n'est pas dû aux interactions entre les atomes d'H dissous et les imperfections réticulaires, mais simplement à l'excitation thermique des niveaux d'énergie quantique des atomes d'H dissous que l'on peut assimiler à des oscillateurs harmoniques.Zusammenfassung-Genaue Messungen der Wasserstofflöslichkeit in Nickel, welches unter Atmo sphärendruck im Gleichgewicht mit H 2 -Gas steht, haben frühere Beobachtungen bestätigt, nach denen die partiellen thermodynamischen Funktionen des H im Nickel sehr temperaturabhängig sind. Dieser Effekt, der in den Ergebnissen wegen des sehr großen Bereiches in der reziproken Temperatur deutlich wird, geht nicht auf die Wechselwirkungen zwischen gelösten H-Atomen und den Gitterfehlern zurück, sondern einfach auf die thermische Anregung der quantenmechanischen Energieniveaus des H-Atoms, welches näherungsweise als ein harmonischer Oszillator angesehen werden kann.

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The H−Ni (Hydrogen-Nickel) system

Wayman

Weatherly

1989

Bulletin of Alloy Phase Diagrams

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The effect of surface contamination on the measured hydrogen solubilities of metals

Cited by 14 publications

References 37 publications

Metal hydride formation at pressures up to 1 Mbar

Metal hydride formation at pressures up to 1 Mbar

Thermodynamics of the Hydrogen–nickel System

The H−Ni (Hydrogen-Nickel) system

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