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Formation pathways in the synthesis and properties of (Tl0.5Pb0.5)(Sr0.9Ba0.1)2Ca2Cu3Oz and (Tl0.5Pb0.5)(Sr0.8Ba0.2)2Ca2Cu3Oz-1223 superconductors
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Auinger, Michael, Gritzner, G., Bertrand, Ch., Galez, Ph. and Soubeyroux, J. -L. (2007) Formation pathways in the synthesis and properties of (Tl0.5Pb0.5)(Sr0.9Ba0.1)2Ca2Cu3Oz and (Tl0.5Pb0.5)(Sr0.8Ba0.2)2Ca2Cu3Oz-1223 superconductors. Superconductor Science and Technology, Volume 20 (Number 7). pp. 704-708. doi:10.1088/0953-2048/20/7/020 ISSN 0953-2048.
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Official URL: http://dx.doi.org/10.1088/0953-2048/20/7/020
Abstract
The formation pathway of (Tl0.5Pb0.5)(Sr0.9Ba0.1)2Ca2Cu3Oz and (Tl0.5Pb0.5)(Sr0.8Ba0.2)2Ca2Cu3Oz was studied by neutron and x-ray diffraction. The following reaction pathway was proposed: thallium oxide and lead oxide react with Sr-rich (Sr1-xCax )CuO2 and Ca-rich (CaxSr1-x)O to form Sr4Tl2O7 and (CaxSr1-x)PbO3, respectively. The thallate and the plumbate compounds then form the (Tl0.5Pb0.5)-1212 phase starting at a temperature of 600 ◦C. Finally, between 850 and 900 ◦C, the 1223 phase is formed from (Tl0.5Pb0.5)-1212, (CaxSr1-x)2CuO3 and CuO.
Parallel experiments to fabricate the (Tl, Pb)-1223 superconductor resulted in specimens with critical temperatures of 117.5 K and 116 K, respectively, and transition widths of 2 K. Differences between the pathways
for the formation of Pb-doped, Sr-rich and Pb-free, Ba-rich Tl-1223 superconductors are discussed.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||
| Journal or Publication Title: | Superconductor Science and Technology | ||||
| Publisher: | Institute of Physics Publishing Ltd. | ||||
| ISSN: | 0953-2048 | ||||
| Official Date: | 2007 | ||||
| Dates: |
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| Volume: | Volume 20 | ||||
| Number: | Number 7 | ||||
| Number of Pages: | 5 | ||||
| Page Range: | pp. 704-708 | ||||
| DOI: | 10.1088/0953-2048/20/7/020 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Date of first compliant deposit: | 29 December 2015 |
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