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Zeitschrift für Naturforschung A

A Journal of Physical Sciences

Editor-in-Chief: Holthaus, Martin

Editorial Board: Fetecau, Corina / Kiefer, Claus


IMPACT FACTOR 2017: 1.414

CiteScore 2018: 1.15

SCImago Journal Rank (SJR) 2018: 0.370
Source Normalized Impact per Paper (SNIP) 2018: 0.431

Online
ISSN
1865-7109
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Volume 23, Issue 12

Issues

Nachweis interstitieller Wasserstoffeinlagerung in NiCu-Legierungen auf magnetischem und röntgenographischem Wege

H. J. Bauer / G. Berninger / G. Zimmermann
Published Online: 2014-06-02 | DOI: https://doi.org/10.1515/zna-1968-1220

Ferromagnetic nickel-copper alloys can be charged with cathodic hydrogen in high concentrations whereby they loose their ferromagnetic behavior. Measurements of magnetization of these alloys show a quicker absorption of hydrogen compared to nickel. The interstitial occlusion of hydrogen gives rise to a reversible lattice expansion of some percent (without change of structure). During the desorption there appear on the studied alloys (10 to 35%) simultaneously two different values of lattice parameters. This is due to the transition between two NiCu-H phases of different H-con-centrations (β- and α-phase). With increasing Cu-content a decreasing lattice expansion of the hydrogen-rich non-ferromagnetic phase is found. This expansion up to a Cu-content of 35% is proportional to the mean magnetic moment per atom of the corresponding hydrogen-free alloy. The comparison with the quantity of absorbed hydrogen suggests further - in analogy to Vegards law for mixed crystals - proportionality between lattice expansion of the β-phase (as function of the Cu-content) and the corresponding atomic ratio hydrogen/metal. The results can be understood as a decrease of the solubility of hydrogen caused by the increased filling of the d-holes by s-electrons of Cu. - Further X-ray studies showed an overcharging effect by an additive continuous increase of the lattice parameters of the β-phase.

About the article

Received: 1968-09-18

Published Online: 2014-06-02

Published in Print: 1968-12-01


Citation Information: Zeitschrift für Naturforschung A, Volume 23, Issue 12, Pages 2023–2029, ISSN (Online) 1865-7109, ISSN (Print) 0932-0784, DOI: https://doi.org/10.1515/zna-1968-1220.

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© 1946 – 2014: Verlag der Zeitschrift für Naturforschung. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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