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Preparation of Superconducting YBa2Cu3O7−x Compounds By Water Extraction Variant Of Sol-Gel Process

Published online by Cambridge University Press:  28 February 2011

A. Deptula ,
W. Lada ,
T. Olczak ,
T. zoltowski  and
A. Di Bartolomeo
A. Deptula
Affiliation:
Institute of Nuclear Chemistry and Technology, Dept. of Structural Research, Warsaw, Poland
W. Lada
Affiliation:
Institute of Nuclear Chemistry and Technology, Dept. of Structural Research, Warsaw, Poland
T. Olczak
Affiliation:
Institute of Nuclear Chemistry and Technology, Dept. of Structural Research, Warsaw, Poland
T. zoltowski
Affiliation:
Institute of Nuclear Chemistry and Technology, Dept. of Structural Research, Warsaw, Poland
A. Di Bartolomeo
Affiliation:
ENEA C.R.E Casaccia, Italy
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Abstract

The starting sols were prepared by addition of ammonium hydroxide to acidic solutions of Y-Ba-Cu acetates or by dissolving solid Ba9CO9 or CuCO9.CuCOH)2H2O in acetates of the remaining components. The sols were then gelled to spherical particles with diameter below 50μm by extracting water with 2-ethyl-l-hexanol or to shard by evaporation of water. After thermal treatment of both powders amorphous and then crystalline YBa2Cu,9O7−x were obtained. Formation of these compounds is strongly improved by aging the gel at 200°C. Green and sintered pellets exhibit excellent superconductivity properties.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 180: Symposium A – Better Ceramics Through Chemistry IV , 1990 , 907
Copyright
Copyright © Materials Research Society 1990

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References

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