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

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

doi:10.1016/j.jallcom.2018.10.346

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 journal › Article › peer-review

4 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 language	English
Pages (from-to)	757-762
Number of pages	6
Journal	Journal of Alloys and Compounds
Volume	776
DOIs	https://doi.org/10.1016/j.jallcom.2018.10.346
Publication status	Published - 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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title = "Anodic oxidization of Al-Y amorphous alloy ribbons and their capacitive properties",

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.",

keywords = "Anodic oxidization, Blackish amorphous alumina, Capacitive, Nanometer-size cavities, Properties, Quantum size effect",

author = "Mikio Fukuhara and Tomoyuki Kuroda and Fumihiko Hasegawa and Yasuyuki Shirai and Toshiyuki Hashida and Kazuya Konno",

year = "2019",

month = mar,

day = "5",

doi = "10.1016/j.jallcom.2018.10.346",

language = "English",

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journal = "Journal of Alloys and Compounds",

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T1 - Anodic oxidization of Al-Y amorphous alloy ribbons and their capacitive properties

AU - Fukuhara, Mikio

AU - Kuroda, Tomoyuki

AU - Hasegawa, Fumihiko

AU - Shirai, Yasuyuki

AU - Hashida, Toshiyuki

AU - Konno, Kazuya

PY - 2019/3/5

Y1 - 2019/3/5

N2 - 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.

AB - 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.

KW - Anodic oxidization

KW - Blackish amorphous alumina

KW - Capacitive

KW - Nanometer-size cavities

KW - Properties

KW - Quantum size effect

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