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 °C 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 a 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
| Original language | English |
|---|---|
| Pages (from-to) | 704 - 708 |
| Number of pages | 5 |
| Journal | Superconductor Science and Technology |
| Volume | 20 |
| Publication status | Published - 2007 |
Fields of science
- 104005 Electrochemistry
- 104006 Solid state chemistry
- 104014 Surface chemistry
- 104017 Physical chemistry
- 105113 Crystallography
- 105116 Mineralogy
- 503013 Subject didactics of natural sciences
- 204 Chemical Process Engineering
- 204001 Inorganic chemical technology
- 205016 Materials testing
- 210006 Nanotechnology
- 211104 Metallurgy
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