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Novel Electrochemical Route for Reduction of Superconducting Bi 2 Sr 2 CaCu 2 O 8+δ
Author(s) -
Matsuda Motohide,
Tamada Hideki,
Yamashita Kimihiro,
Umegaki Takao,
Miyake Michihiro
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb02941.x
Subject(s) - electrochemistry , annealing (glass) , superconductivity , benzoic acid , electrolyte , acetone , chemistry , inorganic chemistry , high temperature superconductivity , analytical chemistry (journal) , doping , materials science , electrode , metallurgy , condensed matter physics , optoelectronics , organic chemistry , physics
A novel electrochemical route was developed for reduction of the superconducting Bi 2 Sr 2 CaCu 2 O 8+δ compound (Bi‐2212) in the over‐hole‐doped state, which was undertaken employing an electrolyte solution consisting of benzoic acid dissolved in acetone. The reduction gave rise to enhancement of the critical temperature ( TC ) of Bi‐2212 up to 90 K. This reduction effect on TC corresponded to the effect of annealing at elevated temperatures in reducing atmospheres. It appears that protons from the benzoic acid carboxyl groups were responsible for the reduction of the Bi‐2212. Structural stability of the electrochemically reduced Bi‐2212 was different from that of Bi‐2212 annealed in reducing atmospheres.