Hostname: page-component-586b7cd67f-t7czq Total loading time: 0 Render date: 2024-11-25T15:26:26.539Z Has data issue: false hasContentIssue false

Preliminary Investigation of Processing and Phase Diagram Construction in the Y‐Sr‐Cu‐O System

Published online by Cambridge University Press:  28 February 2011

T. D. Rolin
Affiliation:
University of Alabama in Huntsville, Departments of Chemistry
F. S. Cheng
Affiliation:
Physics, Huntsville, AL 35899.
J. R. Ashburn
Affiliation:
Physics, Huntsville, AL 35899.
H. Y. Cheng
Affiliation:
Physics, Huntsville, AL 35899.
E. E. Anderson
Affiliation:
University of Alabama in Huntsville, Departments of Chemistry
Get access

Abstract

We have investigated the Y‐Sr‐Cu‐O system which has been reported to form a K2NiF4‐type superconducting phase (TC∼40K) and a “123”‐type phase (Tc‐80K). Difficulties in preparing single phase materials by standard solid state reaction of carbonates and oxides have compelled us to explore other methods. A two‐stage solid state processing technique in addition to a coprecipitation method will be discussed along with the relative advantages and disadvantages of each. Using data obtained from XRD and EDS, we have mapped some of the YO1.5‐SrO‐CuO ternary phase diagram in anticipation of continued efforts at single crystal growth.

Type
Research Article
Copyright
Copyright © Materials Research Society 1990

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 Wu, M.K., Ashburn, J.R., Higgins, C., Loo, B.H., Burns, D.H., Ibrahim, A., Rolin, T.D., Chien, F.Z., and Huang, C.Y., Phys. Rev. B37, 9765 (1988).Google Scholar
2 Yu Mei, , Green, S.M., Jiang, C., and Luo, H.L., Novel Superconductivity, edited by Wolf, S.A. and Kresin, V.Z. (Plenum, New York, 1987), pp. 10411047.Google Scholar
3 Zhang Qi‐rui, , Cao Lie‐zhao, , Qian Yi‐tai, , Chen Zu‐yao, , Guan Wei‐yan, , Zhao Yong, , Pang Guo‐gang Zhang Han, , Xia Jian‐sheng, , Zhang Ming‐jian, , Yu Dao‐qi, , He Zheng‐hui, , Sun Shi‐fang, , Fang Ming‐hu, , Zhang Tao, , Solid State Comm. 63, 535 (1987).Google Scholar
4 Neither can we rule out the possiblity of a crucible‐contaminated aluminum‐stabilized YSr2Cu1‐x Alx)O7‐y Phase superconducting for sufficiently low values of x. We have found the “123” structure to be stable for decreasing values of x (at least as low as 0.08) when processed at increasing temperatures (as high as 1060°C). Very recently, crystals of yet‐to‐be‐determined composition but “123‐like” morphology have been found in “123” melts, but only adjacent to alumina surfaces, whereas attempts with yttria‐stabilized zirconia containers have failed repeatedly. This also suggests the possibility that the pure 123 phase may be stabilized by elevated oxygen pressures (> 1 atm).+1+atm).>Google Scholar