Hostname: page-component-78c5997874-v9fdk Total loading time: 0 Render date: 2024-11-08T02:12:16.940Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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.

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1.Johnson, D. W., Jr., Am. Ceram. Soc. Bull. 64,1597–1602 (1985).Google Scholar
2.Wang, H.H., Carlson, K.D., Geiser, U., Thorn, R.J., Kao, H.C., Beno, M.A., Monaghan, M.R., Allen, T.J., Proksch, R.B., Stupka, D.L., Williams, J. M., Flandermeyer, B. K., and Poeppel, R. B., Inorg. Chem. 26, 1474–1476 (1987).CrossRefGoogle Scholar
3.Bunker, B.C., Voigt, J.A., Doughty, D.H., Lamppa, D.L., and Kimball, K. M., High Temperature Superconducting Materials, Preparations, Properties and Processing, edited by Hatfleld, W. E. and Miller, J. H., Jr. (Marcel Dekker Inc., New York, 1988), p. 121.Google Scholar
4.Chen, X. D., Lee, S. Y., Golben, J. P., Lee, S. I., McMichael, R. D., Song, Y., Noh, T.W., and Gaines, J. R., Rev. Sci. Instrum. 58, 1565–1571 (1987).CrossRefGoogle Scholar
5.Hamdi, A.H., Mantese, J.V., Micheli, A.L., Laugal, R.C.O., Dungan, D.F., Zhang, Z. H., and Padmanabhan, K. R., Appl. Phys. Lett. 51, 2152–2154 (1987).CrossRefGoogle Scholar
6.Sherif, F.G., U.S. Patent #4804649.Google Scholar
7.Marinenko, R. B., Newbury, D. E., Bright, D. S., Myklebust, R. L., and Blendell, J. E., in Microbeam Analysis, edited by Newbury, D. E. (San Francisco Press, San Francisco, CA, 1988), p. 37.Google Scholar
8.Leary, K. J., Jacobson, H. W., Levoy, N. F., Lapalomento, R. A., Askew, T.R., Flippen, R.B., Keller, S.W., and Stacy, A.M., J. Mater. Res. 5, 22–26 (1990).CrossRefGoogle Scholar
9.Ritter, J.J. and Kelly, J.F., High Temperature Superconducting Compounds; Processing and Related Properties, edited by Whang, S. H. and Gupta, A. Das (The Minerals, Metals, and Materials Society, Warrendale, PA, 1989), p. 303.Google Scholar
10.Kolthoff, I. M. and Sandell, E. B., Textbook of Quantitative Inorganic Analysis, 3rd ed. (The MacMillan Co., New York, 1952), p. 322.Google Scholar
11.Garrels, R. M. and Christ, C. L., Solutions, Minerals and Equilibria (Freeman, Cooper & Co., 1965), p. 76.Google Scholar
12.Livage, J., Sol-Gel Science and Technology, edited by Aegerter, M.A., Jafelicci, M.J., Jr., Souza, D.F., and Zanotto, E.D. (World Scientific, NJ, 1989), p. 111.Google Scholar
13.Ritter, J. J., Kelly, J. F., Newbury, D. E., and Minor, D. B., “Molecular Chemistry and the Synthesis of Precursors to Electronic Ceramic Materials”, NIST Special Pub. 804, edited by Davies, Peter and Roth, R. S., 123–136 (1991).Google Scholar