Preparation of (Tl,Bi)(Ba0.4,Sr1.6)Ca2Cu3O9 thick films epitaxially grown on LaAlO3 (100) substrates by a sol-gel process |
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| Authors: | U Spreitzer T Mayerhöfer N Reschauer R Löw K J Range M Kraus P van Haßelt J Markel P Müller K F Renk |
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| Affiliation: | (1) Institut für Experimentelle und Angewandte Physik, Universität Regensburg, 93040 Regensburg, Germany;(2) Institut für Anorganische Chemie, Universität Regensburg, 93040 Regensburg, Germany;(3) Institut für Physik III, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany |
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| Abstract: | We report on the preparation of 5  m thick (Tl,Bi)(Ba0.4,Sr1.6)Ca2Cu3O9 ((Tl,Bi)-1223) high Tc films by a modified sol-gel (Pechini) process. The process was performed by the preparation of a gel containing the metallic atoms, the coating of the substrates with the gel, the pyrolisis of the gel, and a post annealing process, without an additional thallium oxide vapour source. X-ray diffraction patterns ( – 2 scans) showed that the thick films prepared on LaAlO3(100) substrates consisted mainly of the (Tl,Bi)-1223 phase, with high c axis orientation, and  scans revealed epitaxial film growth. EDX measurements showed a composition in good agreement with the (Tl,Bi)-1223 phase. Superconductivity was reached with Tc values up to 102 K. |
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