Synthesis of cuprates of perovskite structure in the Ba-Pb-Cu-O, Ba-Bi-Cu-O, and Ba-Pb-Tl-Cu-O Systems: possible High T<SUB>c</SUB> superconductivity in a perovskite-like phase in the Ba-Pb-Tl-Cu-O system
- Manivannan, V.
- Gopalakrishnan, J.
- Rao, C. N. R.
DOIAbstract
Cubic cuprates (a ~ 18.6 Å) with a BaCuO2-type structure were obtained in the Ba-Pb-Cu-O and Ba-Bi-Cu-O systems by the reaction of the component oxides at a high temperature (1370-1420 K), followed by quenching. By annealing these phases in oxygen at 1070-1120 K, perovskite-like phase (a ~4.3 Å) of the formulae BaPb1-xCuxO3-y and BaBi1-xCuxO3-y (0 < x ≤ 0.5) were obtained. A perovskite of nominal composition BaPb0.25Tl0.25 Cu0.5O3-y, prepared by a similar procedure, was found to be superconducting with a Tc of ~70 K
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