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Compositional homogeneity in processing precursor powders to the Ba2YCu3O7−x high Tc superconductor

Published online by Cambridge University Press:  31 January 2011

James F. Kelly and
Joseph J. Ritter
James F. Kelly
Affiliation:
Ceramics Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
Joseph J. Ritter
Affiliation:
Ceramics Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
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Abstract

We have used scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDS) to study compositional homogeneity at several stages in the processing of powders to the Ba2YCu3Ox high Tc superconductor. We investigated the effects of solution pH and ionic concentration in the precipitation preparation of mixed hydroxycarbonates of Ba, Y, and Cu as precursor to the Ba2YCu3O7−x high Tc superconductor. Our results show that both powder homogeneity and particle morphology are strongly dependent on these parameters. Additionally, studies of the compacted powders by EDS mapping at successive stages of processing show the development of phase inhomogeneities even in homogeneous starting powders.

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Articles
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Journal of Materials Research , Volume 7 , Issue 3 , March 1992, pp. 580 - 584
Copyright
Copyright © Materials Research Society 1992

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