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A Hydroxycarbonate Route to Superconductor Precursor Powders*

Published online by Cambridge University Press:  28 February 2011

J. A. Voigt ,
B. C. Bunker ,
D. H. Doughty ,
D. L. Lamppa  and
K. M. Kimball
J. A. Voigt
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico
B. C. Bunker
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico
D. H. Doughty
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico
D. L. Lamppa
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico
K. M. Kimball
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico
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Abstract

A precipitation process is described for the preparation of powders that can be thermally decomposed to form high critical temperature superconductors such as YBa2Cu3O7. In the process, a cationic solution (a concentrated chloride or nitrate solution) is instantaneously mixed with an anionie solution (a mixture of tetramethylammonium hydroxide and carbonate) to produce a metal-hydroxycarbonate precipitate having the metal stoichiometry of the desired superconducting oxide. The calcining and sintering of the precipitates is critical in controlling the structural integrity and morphology of the superconducting ceramics made from the chem-prep powders, as well as controlling superconducting properties. Under appropriate conditions, high density (>95%) materials that exhibit good superconducting characteristics can be prepared with the chem-prep powders.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 635
Copyright
Copyright © Materials Research Society 1988

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Footnotes

*

This work performed at Sandia National Laboratories supported by the U.S. Department of Energy under contract number DE-AC04–76DP00789.

References

REFERENCES

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