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 reactionpathway was proposed: thallium oxide and lead oxide react with Sr-rich(Sr1−xCax)CuO2 andCa-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 of600 °C. Finally, between850 and 900 °C, the 1223phase is formed from (Tl0.5Pb0.5)-1212, (CaxSr1−x)2CuO3 and CuO.Parallel experiments to fabricate the (Tl, Pb)-1223 superconductor resulted in specimenswith 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.
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