New defect-perovskite oxides related to the yttrium-barium-copper oxide superconductor
- Hegde, M. S.
- Satyalakshmi, K. M.
- Ramesh, S.
- Vasanthacharya, N. Y.
- Gopalakrishnan, J.
DOIAbstract
LaBa2CuCo2O8 and LaBa2Cu2CoO7.4 possessing defect-perovskite structures related to YBa2Cu3O7 (123) have been prepared. The cobalt in both the phases substitutes for the plane copper [Cu(2)] sites, preserving the Cu---O chains of the (123) structure. Accordingly, removal of oxygen from the new phases transforms the orthorhombic structure to the tetragonal structure of YBa2Cu3O7-6. LaBa2CuCo2O8 prepared above 1000°C adopts a disordered cubic perovskite structure
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