Capacitance distribution of Ni-Nb-Zr-H glassy alloys

Mikio Fukuhara, Hajime Yoshida, Nobuhisa Fujima, Hiroshi Kawarada

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Capacitance distribution of {(Ni 0.6Nb 0.4) 1-xZr x} 100-y-H y (x = 0.30, 0.35, 0.40, 0.45 and 0.50, 0 ≥ y ≥ 20) glassy alloy ribbons was carried out by ac impedance analysis at frequency of 1 kHz, in terms of a distributed constant equivalent circuit. The capacitance can be represented by oblique contour lines. The highest capacitance (1-11 μF) could be found near the point when x = 0.40, y = 10, which is a composition occurring room-temperature Coulomb oscillation, while capacitance of the composition (x =0.35, y =4) occurring ballistic transport was around 0.8 μF. The capacitance difference would be explained by an effect of hydrogen localization derived from morphology of distorted Zr-centered icosahedral Zr 5Ni 5Nb 3 clusters and ideal Ni-centered clusters. The electrocapillarity equation showed that the specific capacitance between two electrodes increases parabolic with decreasing the distance, as a polarized glutinous liquid.

Original languageEnglish
Pages (from-to)3848-3852
Number of pages5
JournalJournal of Nanoscience and Nanotechnology
Volume12
Issue number5
DOIs
Publication statusPublished - 2012

Keywords

  • Capacitance
  • Electrocapillarity
  • Glassy Alloys
  • Icosahedral Cluster

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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