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Superconducting properties and structural stability of Bi2Sr2CaCu2O8+δ compound prepared by electrochemical reduction in protogenic electrolyte

Published online by Cambridge University Press:  31 January 2011

Motohide Matsuda ,
Hideki Tamada ,
Kimihiro Yamashita ,
Takao Umegaki  and
Michihiro Miyake
Motohide Matsuda*
Affiliation:
Department of Industrial Chemistry, Faculty of Engineering, Tokyo Metropolitan University, 1–1 Minami-Osawa, Hachioji, Tokyo 192–03, Japan
Hideki Tamada
Affiliation:
Department of Industrial Chemistry, Faculty of Engineering, Tokyo Metropolitan University, 1–1 Minami-Osawa, Hachioji, Tokyo 192–03, Japan
Kimihiro Yamashita
Affiliation:
Department of Industrial Chemistry, Faculty of Engineering, Tokyo Metropolitan University, 1–1 Minami-Osawa, Hachioji, Tokyo 192–03, Japan
Takao Umegaki
Affiliation:
Department of Industrial Chemistry, Faculty of Engineering, Tokyo Metropolitan University, 1–1 Minami-Osawa, Hachioji, Tokyo 192–03, Japan
Michihiro Miyake
Affiliation:
Department of Environmental Chemistry and Materials, Faculty of Environmental Science and Technology, Okayama University, 2-1-1 Tsushima-Naka, Okayama 700, Japan
*
a)Address correspondence to this author at Department of Environmental Chemistry and Materials, Faculty of Environmental Science and Technology, Okayama University, 2-1-1 Tsushima-Naka, Okayama 700, Japan.
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Abstract

Superconducting Bi2Sr2CaCu2O8+δ (Bi-2212) compound was electrochemically reduced in a protogenic electrolyte of benzoic acid dissolved in acetone. The critical temperatures (Tc) of the reduced Bi-2212 were enhanced from 75 K up to ∼90 K, which were reportedly the highest value of Bi-2212 superconductor. In spite of the enhancement of Tc, a diamagnetism of Bi-2212 was weakened after the reduction. This phenomenon was discussed in terms of the flux penetration depth. The electrochemically reduced Bi-2212 had a different structural stability from a partly oxygen-removed Bi-2212 which was prepared by annealing in reducing atmospheres. These results are attributable to injection of protons from the benzoic acid into the Bi-2212 structure.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 12 , December 1997 , pp. 3214 - 3218
Copyright
Copyright © Materials Research Society 1997

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References

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