Skip to main content Accessibility help
×
Home

Ba2YCu3O6.9 Powder Preparation by Sol-Gel Emulsion Techniques

  • M. J. Cima (a1), R. Chiu (a1) and W. E. Rhine (a1)

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.

Copyright

References

Hide All
1. Cima, M.J., presented at the 1987 Am. Cer. Soc. Meeting, Denver, CO, Oct. 1987 (unpublished).
2. Cima, M.J. and Rhine, W.E., Adv. Cer. Mat. 2 (3b), 329 (1987).
3. Hardy, A., McMahon, T., Gowda, G., Riman, R., Rhine, W.E., and Bowen, H.K., presented at the 3rd Int. Ultrastructure Conf., San Diego, CA, Feb. 1987 (unpublished).
4. Reynen, P., Bastius, H., and Fiedler, M., in Ceramic Powders. edited by Vincenzini, (Elsevier Science Publishers, Amsterdam, The Netherlands, 1983), pp. 499504.
5. Kelley, J.L., Kleinsteuber, A.T., Clinton, S.D., and Dean, O.C., Indust. Eng. Chem. Proc. Des. and Dev. 4 (2), 212 (1965).
6. Hass, P.A. and Clinton, S.D., Indust. Eng. Chem. Proc. Des. and Dev. 5 (3), 236 (1966).
7. Hass, P.A., Clinton, S.D., and Kleinsteuber, A.T., Can. Chem. Eng. 1966. 348.
8. Woodhead, J.L., Sci. of Ceramics 4, 4, 105 (1968).
9. Woodhead, J.L., Sci. of Ceramics 4, 4, 105 (1968).
10. Gowda, G. and Bowen, H.K., presented at the Am. Cer. Soc. Basic Sci. Div. meeting, New Orleans, 1986 (unpublished).

Ba2YCu3O6.9 Powder Preparation by Sol-Gel Emulsion Techniques

  • M. J. Cima (a1), R. Chiu (a1) and W. E. Rhine (a1)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed