Hostname: page-component-745bb68f8f-b6zl4 Total loading time: 0 Render date: 2025-02-04T15:57:55.178Z Has data issue: false hasContentIssue false
  • English
  • Français

The Formation of Y-Ba-Cu-O Phases During Solid State Reaction

Published online by Cambridge University Press:  28 February 2011

T. S. Chin ,
T. W. Huang ,
W. T Lin ,
N. C. Wu ,
Y. H. Chou ,
T. C. Wu ,
P. T. Wu  and
H. H. Yen
T. S. Chin
Affiliation:
Department of Materials Eng., National Cheng Kung University, Taiwan
T. W. Huang
Affiliation:
Department of Materials Eng., National Cheng Kung University, Taiwan
W. T Lin
Affiliation:
Department of Materials Eng., National Cheng Kung University, Taiwan
N. C. Wu
Affiliation:
Department of Materials Eng., National Cheng Kung University, Taiwan
Y. H. Chou
Affiliation:
Department of Materials Eng., National Cheng Kung University, Taiwan
T. C. Wu
Affiliation:
Department of Materials Eng., National Cheng Kung University, Taiwan
P. T. Wu
Affiliation:
Department of Materials Eng., National Cheng Kung University, Taiwan
H. H. Yen
Affiliation:
Department of Materials Eng., National Cheng Kung University, Taiwan
Get access

Abstract

The formation of Y-Ba-Cu-O phases, including the high Tc superconducting YBa2Cu3O7−x (Y123) phase, during solid state reaction of the mixture of Y2O3: BacO3: CuO, in molar ratio of 0.2:0.6:1 to conform the formula of the perovskite (Y0.4 Ba0.6)CuO3 composition was studied by means of DTA, DTG and X-ray difractometry(XRD). For continuous heating at 10 C/min, it was found that the Y123 phase exists at 790–995 C, and gradually disappears at higher temperatures. The insulating Y2BaCuO5 (Y211) phase exists at 985 to 1190 C, the maximum experiment temperature. While the semiconducting YBa3Cu2O7-y, (Y132) phase coexists with the Y123 phase. For isothermal heating, it was found that the most appropriate temperature and time for the formation of the Y123 phase is 900 C and 16 hours. Semiquantitative data on the amount of phases presented, including the above mentioned phases and other binary Ba-Y-O or Ba-Cu-O phases, during heating are also given. High temperature superconductor with a Tc of around 93 K can be synthesized reproducibly by the processes based on this study.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 261
Copyright
Copyright © Materials Research Society 1988

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

1. Wu, M.K., Ashburn, J.R., Torng, C.J., Hor, P.H., Meng, R.L., Gao, L., Huang, Z.J., Wang, Y.Q. and Chu, C.W., Phy. Rev. Lett. 58 908 (1987).Google Scholar
2. Hor, P.H., Meng, R.L., Wang, Y.Q., Gao, L., Huang, Z.J., Bechtold, J., Forster, K. and Chu, C.W., Phy. Rev. Lett. 58 1891 (1987).Google Scholar
3. Kitazawa, K., Atake, T., Ishii, H., Sato, H., Takagi, H., Kiushio, K., Uchida, S., Saito, Y., Fueki, K., and Tanaka, S., Jap. J. Appl. Phys. 26, L748 (1987); and also pp L601, L682, L694, and L751 of the same volume.Google Scholar
4. Tavasion, J.M., Barboux, P., Bagley, B.G., Greene, L.H., Mckinnon, W.R. and Hull, G.W., Am. Chem. Soc. Symp. Sept. (1987) ;in press.Google Scholar
5. Huang, T.W., Wu, N.C., Chou, Y.H., Lin, W.T., Wu, T.C., Chin, T.S., Wu, P.T., Yen, H.H., and Chen, Y.C., J. Crystal Growth, in press.Google Scholar
6. Chung, F.H., J. Appl. Cryst. 7, 519 (1974).Google Scholar
7. JCPDS: International Centre for Diffraction Data, 1601 Parke Lane, Swarthmore, PA 19081, U.S.A.Google Scholar