Hydrogen permeation characteristics and structural features of melt-spun Ni-Nb-Zr amorphous alloy membranes

S. Yamaura, K. Wakoh, H. M. Kimura, E. Matsubara, A. Inoue, Y. Shimpo, M. Nishida, O. Kajita

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We examined the hydrogen permeation of melt-spun Ni-Nb-Zr amorphous alloys. The interatomic spacing in the (Ni0.6Nb0.4) 100-xZrx (x = 0-50) amorphous structure increased with increasing Zr content. The permeability of the alloys is strongly dependent on alloy compositions. The maximum hydrogen permeability was 1.59 x 10-8 (mol/m sPa1/2) at 673 K for the (Ni0.6Nb 50Zr50 amorphous alloy. It is noticed that the permeability is as high as that of pure Pd metal at 673 K. The hydrogen permeability of the amorphous alloy is larger than that of pure Pd metal at the temperature below 673 K. Moreover, it is important to study the relationship between hydrogen permeation and atomic structure of amorphous alloys to understand the hydrogen permeation mechanism through amorphous alloys. We investigated the amorphous structures of these alloys by the radial distribution function (RDF) analysis. As a result, it was found that the number of the Zr-Zr pair which has larger interatomic distance than any other pairs such as Ni-Ni, Nb-Nb, Ni-Nb, Ni-Zr and Nb-Zr increased with increasing Zr content. Therefore, hydrogen atoms can permeate more easily through the Ni-Nb-Zr amorphous membrane with higher Zr content in the composition range of Ni-Nb-Zr amorphous alloys prepared in this work. These permeation characteristics and structural features indicate the possibility of future practical use of the melt-spun amorphous alloys as a hydrogen permeable membrane.

    Original languageEnglish
    Pages (from-to)315-318
    Number of pages4
    JournalJournal of Metastable and Nanocrystalline Materials
    Volume24-25
    DOIs
    Publication statusPublished - 2005

    Keywords

    • Amorphous alloy
    • Hydrogen permeation
    • Hydrogen purification
    • Hydrogen separation
    • Melt-spinning

    ASJC Scopus subject areas

    • Materials Science (miscellaneous)
    • Materials Science(all)
    • Condensed Matter Physics
    • Physical and Theoretical Chemistry

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