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

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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 > 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:	Date Event 2007 Published
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

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