Anodic oxidization of Al-Y amorphous alloy ribbons and their capacitive properties

Mikio Fukuhara, Tomoyuki Kuroda, Fumihiko Hasegawa, Yasuyuki Shirai, Toshiyuki Hashida, Kazuya Konno

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Blackish amorphous aluminium oxide film on AlY10 amorphous alloy ribbons was prepared by anodic polarization process in H2SO4 solutions, showing electric storage on uneven surfaces with a convexity of 18 nm in diameter. The longest discharging time was obtained by current ratio (I2/I1) of 0.4 at 16 V and 5 mass% H2SO4. The discharging time increases and decreases with increasing charging time and charging current, and then saturates after around 100 s and 1 μA, respectively. The resulting film shows a vertical line after Warburg region in a Nyquist diagram, rapid increases in the imaginary impedance, and a phase angle of −90° at 1 mHz in the Bode diagram, demonstrating evidence for use in an electric distributed constant circuit. The film indicates a switching effect for both positive (∼+8.6 eV) and negative (∼-11.2 eV) potentials.

Original languageEnglish
Pages (from-to)757-762
Number of pages6
JournalJournal of Alloys and Compounds
Volume776
DOIs
Publication statusPublished - 2019 Mar 5

Keywords

  • Anodic oxidization
  • Blackish amorphous alumina
  • Capacitive
  • Nanometer-size cavities
  • Properties
  • Quantum size effect

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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