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Soluble and Volatile Precursors for the Preparation of Superconducting Films

Published online by Cambridge University Press:  28 February 2011

Nancy N. Sauer ,
Eduardo Garcia  and
Robert R. Ryan
Nancy N. Sauer
Affiliation:
Isotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Eduardo Garcia
Affiliation:
Isotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Robert R. Ryan
Affiliation:
Isotope and Nuclear Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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Abstract

Attempts to identify intermediates in an alkoxide-based solution route to films of the high temperature superconductor YBa2Cu3O7 reported by Fahrenholtz et al.[1] have led to the isolation of the first molecular barium-copper cluster, Ba2Cu2(OR)4(acac)4·2 HOR, R = CH2CH2OCH3. The extension of this route to the preparation of the bismuth superconductors has necessitated the investigation of bismuth alkoxide chemistry. Two separate routes to bismuth alkoxides have been examined: the metathesis of the metal halides with NaOR, (R = t-butyl, and diisopropylphenoxide) and the alcoholysis of bismuth amides, Bi(NR2)3, [R = N(SiMe3)2] The alcoholysis preparation gives high yields of several alkoxides suitable as precursors to the high Tc materials. A monomeric bismuth phenoxide, which is targeted as a volatile precursor, and a bismuth t-butoxide cluster have been isolated and stucturally characterized. Solubility and volatility studies have also been undertaken.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 180: Symposium A – Better Ceramics Through Chemistry IV , 1990 , 921
Copyright
Copyright © Materials Research Society 1990

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References

REFERENCES

1. Fahrenholtz, W. G., Millar, G. M., Payne, D. A., American Ceramic Society Symp. Proc., “Ceramic Superconductors”, May 1–5 1988.Google Scholar
2. Sauer, N. N., Garcia, E., Salazar, K. V., Ryan, R. R., Martin, J.A., J. Am. Chem. Soc., 112, 1524, (1989).Google Scholar
3. Clegg, W., Compton, N. A., Errington, R. J., Norman, N. C., Wishart, N., Polyhedron, 8, 1579, (1989).Google Scholar