Distorted icosahedral Ni5Nb3Zr5 clusters in the as-quenched and hydrogenated amorphous (Ni0.6Nb 0.4)0.65Zr0.35 alloys

M. Matsuura, M. Fukuhara, K. Konno, T. Fujita, M. W. Chen, N. Fujima, A. Inoue

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Local structures of the hydrogenated (Ni0.6Nb 0.4)1-xZrx (x = 0.3-0.4) amorphous alloys attract much attention for the sake of their epoch-making electronic transport behaviors. We investigated the local structures by XAFS for the as-quenched (Ni0.6Nb0.4)0.65Zr0.35 and hydrogenated [(Ni0.6Nb0.4)0.65Zr 0.35]0.922H0.078 amorphous alloys, in which ballistic conductivity has been observed. XAFS results of the Ni K-edge are analyzed based on the structure model deduced by the first principle calculation. The analysis suggests that highly distorted icosahedral Ni 5Nb3Zr5 cluster, which has a centered-Ni and a surrounding Nb triangle, is a main structural unit of (Ni0.6Nb 0.4)0.65Zr0.35 and the [(Ni 0.6Nb0.4)0.65Zr0.35] 0.922H0.078 amorphous alloys. This distorted icosahedral Ni5Nb3Zr5 cluster can be associated with the occurrence of the singular electronic transport behaviors of the hydrogenated (Ni0.6Nb0.4)0.65Zr0.35 alloy.

Original languageEnglish
Pages (from-to)3357-3360
Number of pages4
JournalJournal of Non-Crystalline Solids
Volume357
Issue number18
DOIs
Publication statusPublished - 2011 Sep 15

Keywords

  • Amorphous
  • EXAFS
  • Hydrogen
  • NiNbZr
  • XAFS

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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