Die Löslichkeit von Deuterium in festem Nickel

Sieverts, A.; Danz, W.

doi:10.1002/zaac.19412470111

Cited by 13 publications

(12 citation statements)

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“…We also need the composition dependence of D(EF). For the conduction band we assume that Dsp(EF) is constant, while for the d band we take For Pd-Ag, (6) with the parameters nh =r 0.55 to 0.60 represents approximately the observed variation with composition of the spin susceptibility [ 13,151 and the low-temperature specific heat coefficient [ 161. Because of many-body enhancement effects, (6) is probably not a good representation of the bare density of states for small Ag contents [ll], but does give a simple parametrization of the experimental density of states function.…”

Section: Results and Analysismentioning

confidence: 99%

“…Because of many-body enhancement effects, (6) is probably not a good representation of the bare density of states for small Ag contents [ll], but does give a simple parametrization of the experimental density of states function. The quantity x / ( ly), which is just H/Pd, is used in (6) in place of simply the hydrogen-to-metal atom ratio x = [H/M], because we found that it resulted in a more consistent fit to the data and also because it implies a filled d band a t values of x corresponding more nearly to the (u + b) -b phase boundary.…”

Section: Results and Analysismentioning

confidence: 99%

“…From expressions (1) through (6) we can write the resistivity in either the u or @ phase of Pdl-,Ag,H, In the two-phase region we simply take a weighted average of 6he single-phase conductivities, so that for xa < x < xp. Fletcher et al [17] have used an expression intermediate between this and the average of the single-phase resistivities in fitting their data in the mixed-phase region of PdH,, but (8) is adequate for our purpose.…”

Section: Results and Analysismentioning

confidence: 99%

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Residual resistivity of the PdAgH system

Bambakidis

Smith

Otterson

1974

Phys. Stat. Sol. (a)

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The electrical resistivity of a seriea of Pdl-,Ag, alloys, with 0 < y 5 0.5, containing hydrogen up t o an H/Pd atom ratio of 0.8, has been measured at 4.2 K, and the results analysed using the Mott two-band model for the resistivity of transition-metal alloys. A distinct effect is the decrease in s p a scattering brought about b y filling of the 4d band by the H. The ratio of sp-d to sp-sp scattering strengths for hydrogen in Pd-Ag-H is somewhat greater than the corresponding ratio for the P d and Ag. The strength of the scattering by the hydrogen increases with H content, which may reflect an increase in the density of sp states a t the Fermi level. The results indicate that it is the hydrogen-to-palladium rather than the hydrogen-to-metal atom ratio that is important in this system, which is consistent with the idea that the Pd-H interaction is much stronger than that between Ag and H. La rksistiviti: electrique d'une sbrie d'alliages P d l -,Ag,, avec 0 < y 5 0,5, contewnt de l'hydrogkne jusqu'B u n rapport atomique H/Pd de 0,8, a Bt6 mesurhe B 4,2 K, et les r8sultats ont BtB analysks en utilisant le modde des deux bandes de Mott pour la rksistiviti: des alliages des mktaux de transition. Un effet distinct consiste en la diminution de la dispersion sp-d, produit par le remplissage de la bande 4d par l'hydrogkne. Le rapport sp-d/sp-sp de la force de dispersion pour l'hydrogbne dans l'alliage Pd-Ag-H est sensiblement plus grand que le rapport correspondant pour le P d e t 1'Ag. La force de dispersion par l'hydrogene s'accroit avec la teneur en H, ce qui peut reflhter un accroissement de la densiti: dea Btats sp au niveau de Fermi. Les r6sultats montrent que le rapport hydrogkne-palladium est important dans ce systkme, plut6t que le rapport hydrog&ne-mi:tal, ce qui est compation nvec une interaction Pd-H plus forte qu'une interaction Ag-H.

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Section: Results and Analysismentioning

confidence: 99%

Section: Results and Analysismentioning

confidence: 99%

Section: Results and Analysismentioning

confidence: 99%

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Residual resistivity of the PdAgH system

Bambakidis

Smith

Otterson

1974

Phys. Stat. Sol. (a)

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“…Similar systems which have been studied are palladium-hydrogen (1,54,122,159,188,193), carbon-bromine (122), silica-bromine (122), and chabasiteoxygen (122).…”

Section: Active Oxidesmentioning

confidence: 99%

Magnetism and Catalysis.

Selwood¹

1946

Chem. Rev.

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“…Hydrogen isotope effects attract research attention because of its importance for both fundamental and technical reasons. [1][2][3][4][5][6][7][8][9][10][11][12][13] The most prominent equilibrium hydrogen isotope effect is observed for the hydrogen-Pd system. The hydrogen isotope effect observed from the absorption/desorption isotherms is of interest since the isotherms of mixed isotopes deviate from those of the single isotopes, which provide useful information for understanding the mechanism of isotope exchange.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium Isotope Effect for Hydrogen Absorption in Palladium

2009

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Absorption isotherms at 323 K for the H-D-Pd system were measured by introducing H 2 and D 2 into Pd in sequence. The method using addition of isotopes to the system in sequence to investigate isotope exchange effects has not been previously reported. The equilibrium absorption pressure in the plateau region of the mixed-isotope system varies with the ratio of H/D in the solid phase. It lies between those of the singleisotope systems of H-Pd and D-Pd. Higher equilibrium pressures are associated with high D/H ratios in the solid phase. A model proposed previously (Luo, W.; Cowgill, D.; Causey, R.; Stewart, K. J. Phys. Chem., B 2008, 112, 8099) for mixed isotope hydride desorption, which correlates the equilibrium plateau pressure of the mixed H-D system with the fractions of D and H in the solid and the equilibrium plateau pressures of the single-isotope systems, is also successfully applied to absorption. When D 2 is introduced into the H-Pd system in the plateau region, both the H-D exchange processes in the gas phase and net H (D) absorption take place. The former does not result in a total pressure change, but the latter creates a total pressure decrease. These reactions produce a D concentration increase in both the bulk Pd and the gaseous phase, as expected. Curiously, however, they also result in a counterintuitive small H concentration increase in bulk Pd and a decrease in gaseous H. Analogous results are obtained when the order of D 2 -H 2 introduction is reversed. In the plateau region, isotope displacement does not take place. Once in the β-phase, isotope displacement does take place. The equilibrium isotope H-D partitions in the gas phase, H 2 , HD, and D 2 , are controlled by the equilibrium constant, K HD , and their equilibrium partitions among H and D between gas and bulk Pd are controlled by the separation factor, R.

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Die Löslichkeit von Deuterium in festem Nickel

Cited by 13 publications

References 1 publication

Residual resistivity of the PdAgH system

Residual resistivity of the PdAgH system

Magnetism and Catalysis.

Equilibrium Isotope Effect for Hydrogen Absorption in Palladium

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