Effect of chemical substitution and oxide additives on the Tc behaviour of the oxide superconductor,Bi4Sr3Ca3Cu4O16 |
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Authors: | G V Subba Rao S Natarajan U V Varadaraju |
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Institution: | Materials Science Research Centre , Indian Institute of Technology , Madras, 600 036, India |
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Abstract: | Studies on the superconductivity behaviour of pure and doped (Pb,TI) Bi4Sr3Ca3Cu4O16 phases are reported. Effect of oxide additives PbO, BaPbO3 and BaBiO3 has also been examined. Results show that an oxygen treatment at 600°C for 12 h during the final stages of the synthesis has the beneficial effect of sharpening the Tc zero of the 4334 Bi-composition. Pb and TI substitution has only a marginally beneficial effect on the Tc , though it is not definitely known whether substitution is actually occurring in the system. PbO as an additive raises the Tc zero to 89 K, whereas other additives do not basically affect the properties of the 4334 system. |
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Keywords: | High Tc oxide superconductors Bi-4334 oxide additives |
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