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The Electrochemical Response of YBa2Cu3O7-x in Aqueous Solutions

Published online by Cambridge University Press:  28 February 2011

T.S. Chin ,
H.C. Shih ,
C.A. Lin ,
T.W. Huang ,
W.T. Tsai  and
M.P. Hung
T.S. Chin
Affiliation:
Department of Materials Science & Engineering, National Tsing Hua Hua University, Hsinchu, 30043, Taiwan, Rep. of China
H.C. Shih
Affiliation:
Department of Materials Science & Engineering, National Tsing Hua Hua University, Hsinchu, 30043, Taiwan, Rep. of China
C.A. Lin
Affiliation:
Department of Materials Science & Engineering, National Tsing Hua Hua University, Hsinchu, 30043, Taiwan, Rep. of China
T.W. Huang
Affiliation:
Department of Materials Engineering, National Cheng Kung University University, Tainan, 70100, Taiwan, Rep. of China
W.T. Tsai
Affiliation:
Department of Materials Science & Engineering, National Tsing Hua Hua University, Hsinchu, 30043, Taiwan, Rep. of China
M.P. Hung
Affiliation:
Department of Materials Science & Engineering, National Tsing Hua Hua University, Hsinchu, 30043, Taiwan, Rep. of China
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Abstract

Electrochemical behavior of a YBa2Cu3O7 (YBCO for short) superconductor was studied by potentiodynamic scanning in different aqueous solutions with 0.1 M concentration. The electrochemical stability of the YBC0 compound was found to be superior in sulfurous acid, NaC1, or KC1 solutions. The dissolution potential in the above solutions ranges from 36 – 92 mV, polarization wasn't possible. However, E raised up to 360 – 960 mV in acids corr solutions with oxidizing potential including suluric, phosphoric and nitric acids indicating a passive behavior. Polarization was observed in sulfuric, sulfurous, and phosphoric acids depicting their potential to be used as etching solutions in lithography of this oxide superconductor. Its electrochemical behavior in HC1 solution is peculiar and informative. It shows three transitions in the polarization curve, corresponding to 272, 756, and 1013 mV, respectively. This is probably related to the transition in the valence states of copper ions during dissolution which is suppressed in the oxidizing acids. In comparison with metallic copper, the YBCO is more stable in the above solutions. The Galvanic current decreases at the order of A1 > Cu > Ag, when the YBC0 is coupled with each of them in 1 M phosphoric acid solution.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 1115
Copyright
Copyright © Materials Research Society 1990

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References

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