Hostname: page-component-78c5997874-8bhkd Total loading time: 0 Render date: 2024-11-04T18:34:59.653Z Has data issue: false hasContentIssue false
  • English
  • Français

Effect of atmosphere and rare earth on liquidus relations in RE–Ba–Cu Oxides

Published online by Cambridge University Press:  31 January 2011

J. E. Ullman ,
R. W. McCallum  and
J. D. Verhoeven
J. E. Ullman
Affiliation:
Ames Laboratory and Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011
R. W. McCallum
Affiliation:
Ames Laboratory and Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011
J. D. Verhoeven
Affiliation:
Ames Laboratory and Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011
Get access

Abstract

In the processing of the high temperature superconductors RE1Ba2Cu3O7−x a knowledge of the liquidus temperatures is required in order to avoid liquid formation during the initial reactions of the starting materials. We have investigated the invariant points on the liquidus surface of the RE–Ba–Cu–O systems for RE = Y, Er, Gd, and Nd in oxygen, air, and argon, While the temperatures of the low melting reactions are almost independent of the rare earth species, they are heavily dependent on oxygen partial pressure. In addition, the peritectic decomposition temperature of the REBa2Cu3O7 phase was found to be a function of rare earth with a significantly higher value for the Nd compound than for the other rare earths.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 4 , Issue 4 , August 1989 , pp. 752 - 754
Copyright
Copyright © Materials Research Society 1989

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

REFERENCES

1Nakahara, S., Fisanick, G. J., Yan, M. F., VanDover, R. B., Boone, T., and Moore, R., J. Cryst. Growth 85, 639 (1987).CrossRefGoogle Scholar
2Verhoeven, J. D., Bevolo, A. J., McCallum, R. W., Gibson, E. D., and Noack, M. A., Appl. Phys. Lett. 52, 745 (1988).CrossRefGoogle Scholar
3Shaw, T. M., Shinde, S.L., Dimos, D., Cook, R. F., Duncombe, P. R., and Kroll, C., J. Mater. Res. 4 (2), 248 (1989).CrossRefGoogle Scholar
4No, K., Verhoeven, J. D., McCallum, R.W., and Gibson, E. D., Proc. App. Superconductivity Conf. (San Francisco, CA, 1988) (in press).Google Scholar
5See, for example, McCallum, R. W., Verhoeven, J. D., Noack, M. A., Gibson, E. D., Laabs, F. C., Finnemore, D.K., and Moodenbaugh, A. R., Adv. Cer. Mat. 2 (38), 388 (1987).Google Scholar
6Roth, R. S., Davis, K.L., and Dennis, J.R., Adv. Cer. Mat. 2 (38), 303 (1987).Google Scholar
7Aselage, T. and Keefer, K., J. Mater. Res. 3 (6), 1279 (1988).Google Scholar