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Preparation of superconducting YBa2Cu4O8 by the sol-gel method

Published online by Cambridge University Press:  31 January 2011

Shinobu Fujihara ,
Haoren Zhuang ,
Toshinobu Yoko ,
Hiromitsu Kozuka  and
Sumio Sakka
Shinobu Fujihara
Affiliation:
Institute for Chemical Research, Kyoto University, Uji, Kyoto-Fu 611, Japan
Haoren Zhuang
Affiliation:
Institute for Chemical Research, Kyoto University, Uji, Kyoto-Fu 611, Japan
Toshinobu Yoko
Affiliation:
Institute for Chemical Research, Kyoto University, Uji, Kyoto-Fu 611, Japan
Hiromitsu Kozuka
Affiliation:
Institute for Chemical Research, Kyoto University, Uji, Kyoto-Fu 611, Japan
Sumio Sakka
Affiliation:
Institute for Chemical Research, Kyoto University, Uji, Kyoto-Fu 611, Japan
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Abstract

Superconducting YBa2Cu4O8 ceramics were synthesized by the sol-gel method using corresponding metal acetates as starting materials, water as solvent, and tartaric acid under 1 atm oxygen pressure. YBa2Cu4O8 powder was obtained as a single phase by heating the gel at 780 °C for 30 h in flowing oxygen. Tc was 80 K from magnetic susceptibility measurements. Pelletizing and sintering this powder revealed Tc (onset) of 87 K and Tc (end) of 78 K from resistance measurements. YBa2Cu4O8 pellets sintered at 780 °C for 30 h in O2 also consist of a single phase with Tc (onset) of 85 K and Tc (end) of 75 K.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 9 , September 1992 , pp. 2355 - 2359
Copyright
Copyright © Materials Research Society 1992

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