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Mott-Schottky Plot of the Passive Film Formed on Iron in Neutral Borate and Phosphate Solutions

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J.Electrochem.Soc.134,1352-1357(1987), Mott-Schottky ---iron --.pdf711.61 kBPDFView/Open
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Title: Mott-Schottky Plot of the Passive Film Formed on Iron in Neutral Borate and Phosphate Solutions
Authors: Azumi, Kazuhisa Browse this author
Ohtsuka, Toshiaki Browse this author →KAKEN DB
Sato, Norio Browse this author
Keywords: semiconductor thin films
electrochemical electrodes
localised states
Schottky barriers
Issue Date: Jun-1987
Publisher: The Electrochemical Society
Journal Title: J. Electrochemical Society
Volume: 134
Issue: 6
Start Page: 1352
End Page: 1357
Publisher DOI: 10.1149/1.2100672
Abstract: The semiconductive properties of the passive film formed on iron were investigated by measuring the impedance of passivated iron electrodes in neutral borate and phosphate solutions. Mott-Schottky type of plot was applied to the impedance data to obtain the donor density ND and the flatband potential VFB as a function of film formation potential, oxidation time, and ion species present in the solution. The value of ND obtained for the passive film is in the range of 1×10^26-2×10^27m^-3 and decreases with increasing formation potential and oxidation time, indicating that the structural and electronic defects in the passive film decrease with increasing film thickness. The value of ND of the passive film formed in phosphate solution is greater than that in borate solution. From the fact that when the electrolyte was changed from borate to phosphate solution ND increased from the value in borate solution to the value in phosphate solution in a time period of about 10^3s, it is evident that phosphate ions penetrate into the passive film producing a large number of defects.
Rights: © The Electrochemical Society, Inc. 1987. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in J. Electrochem. Soc. 1987 volume 134, issue 6, 1352-1357.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大塚 俊明

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