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Synthesis of Nanocrystalline Powders for Oxide Ceramics by Microwave Plasma Pyrolysis

Published online by Cambridge University Press:  25 February 2011

Dieter Vollath ,
Ravi Varma  and
Kurt E. Sickafus
Dieter Vollath
Affiliation:
Kernforschungszentrum Karlsruhe, Institut fur Materialforschung, P. O. Box 3640, W-7500 Karlsruhe, Germany
Ravi Varma
Affiliation:
Los Alamos National Labortory Materials Science and Technology Division, Los Alamos, N.M., U.S.A.
Kurt E. Sickafus
Affiliation:
Los Alamos National Labortory Materials Science and Technology Division, Los Alamos, N.M., U.S.A.
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Abstract

Pyrolytically prepared ceramic powders usually exhibit excellent homogeneity and small grain sizes. The energy efficiency of those methods for synthesis is, particularly in systems heated electrically, very poor. The situation can be improved drastically using a microwave plasma as a source of energy. This has been confirmed by the synthesis of alumina- and zirconia-based ceramic powders for which an efficiency of more than 80% was found. Aqueous solutions of nitrates of zirconium, yttrium, and aluminum were used as starting materials. Electron microscopy revealed that, through proper selection of the experimental conditions, it is possible to obtain nanocrystalline powders with cubic structure. Because of the extreme conditions during synthesis, it is possible to prepare solid solutions in systems without solubility.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 269: Symposium L – Microwave Processing of Materials III , 1992 , 379
Copyright
Copyright © Materials Research Society 1992

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References

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