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Soft chemical preparation and electrochemical oxygen doping of La2Can−1CunO2n+2

Published online by Cambridge University Press:  31 January 2011

Shinichi Kikkawa ,
Noriko Taya  and
Fumikazu Kanamaru
Shinichi Kikkawa
Affiliation:
ISIR, Osaka University, Ibaraki, Osaka 567, Japan
Noriko Taya
Affiliation:
ISIR, Osaka University, Ibaraki, Osaka 567, Japan
Fumikazu Kanamaru
Affiliation:
ISIR, Osaka University, Ibaraki, Osaka 567, Japan
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Abstract

La2CaCu2O6 (n = 2) was obtained at temperatures as low as 800 °C by firing the coprecipitates from a mixed aqueous solution of La, Ca, and Cu acetates which were titrated with tartaric acid. The firing temperature was much lower than that in solid state reactions which are usually conducted above 1000 °C. Both La2Ca2Cu3O8 (n = 3) and La2Ca3Cu4O10 (n = 4) were obtained at 700 °C in a similar preparation method. Low temperature firing was very important for these preparations. A porous sintered body of La2CaCu2O6 with a relative density of about 15% was also obtained using this preparation method. This porous sintered body could be effectively oxygen-doped by electrochemical oxidation showing the presence of a new superconducting phase with Tc around 30 K.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 4 , April 1998 , pp. 812 - 815
Copyright
Copyright © Materials Research Society 1998

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References

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