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Comparison of Several CU(I) and CU(II) Precursors for the Sol-Gel Preparation of High TC Superconducting Metal Oxides

Published online by Cambridge University Press:  25 February 2011

Mariquita A. Accibal ,
Jonathan W. Draxton ,
Allen H. Gabor ,
Wayne L. Gladfelter ,
Beth Anne Hassler  and
Martha L. Mecartney
Mariquita A. Accibal
Affiliation:
Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455
Jonathan W. Draxton
Affiliation:
Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455
Allen H. Gabor
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
Wayne L. Gladfelter
Affiliation:
Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455
Beth Anne Hassler
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
Martha L. Mecartney
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
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Abstract

A comparison of the use of three different coordination compounds of copper as precursors for the sol-gel synthesis of YBa2Cu3O7-δ has been made. For yttrium, the tris(isopropoxide) was used exclusively, while the use of both Ba(O-i-Pr)2 and Ba(OCH2CH2OEt)2 (prepared in situ from Ba metal) as sources for Ba were studied. After dissolving Y(O-i-pr)3, a Ba source, and the copper(I) alkoxide, [Cu(O-i-Bu)]4, hydrolysis led immediately to an orange gelatinous solid which yielded YBa2Cu3O7-δ upon firing in oxygen. Copper(II) acetate was found to give heterogeneous mixtures under our conditions and was not further studied. Copper(II) acac (acac = acetylacetonate) yielded the best results. Partially hydrolyzed solutions of Cu(acac)2, Ba(OCH2CH2OEt)2, and Y(O-i-pr)3 were spin coated on SrTi03 (100) and fired under oxygen to give oriented (b axis normal to the surface) thin films of YBa2Cu3O7-δ. The onset of superconductivity for the films was 92 K, but they did not reach zero resistance until much lower temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 121: Symposium H – Better Ceramics Through Chemistry III , 1988 , 401
Copyright
Copyright © Materials Research Society 1988

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References

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