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Ba2YCu3O6.9 Powder Preparation by Sol-Gel Emulsion Techniques

Published online by Cambridge University Press:  28 February 2011

M. J. Cima ,
R. Chiu  and
W. E. Rhine
M. J. Cima
Affiliation:
Ceramics Processing Research Laboratory, Materials Processing Center, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139
R. Chiu
Affiliation:
Ceramics Processing Research Laboratory, Materials Processing Center, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139
W. E. Rhine
Affiliation:
Ceramics Processing Research Laboratory, Materials Processing Center, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139
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Abstract

Barium yttrium cuprate powders were prepared by a sol-gel emulsion process in which an aqueous nitrate solution containing Ba, Y, and Cu in the correct stoichiometry was emulsified in heptane. The resulting micrometer-sized droplets were gelled by adding a high-molecular-weight primary amine that extracts nitric acid from the aqueous phase and raises the pH of the droplets. Thermal gravimetric analysis revealed that the correct overall stoichiometry was obtained at temperatures lower than 400 °C during calcination, but X-ray diffraction showed that calcination at temperatures greater than 800° may be required to produce the correct phase. One possible advantage of this technique is the control of powder morphology on a micrometer scale so that powders can be prepared for advanced ceramics processing methods. Also, segregation of components, if any, will be restricted to distances less than one micrometer.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 241
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

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