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New defect-perovskite oxides related to the yttrium-barium-copper oxide superconductor

Hegde, MS and Satyalakshmi, KM and Ramesh, S and Vasanthacharya, NY and Gopalakrishnan, J (1992) New defect-perovskite oxides related to the yttrium-barium-copper oxide superconductor. In: Materials Research Bulletin, 27 (9). pp. 1099-1106.

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$LaBa_2CuCo_2O_8$ and $LaBa_2Cu_2CoO_{7.4}$ possessing defect-perovskite structures related to $YBa_2Cu_3O_7$ (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 $YBa_2Cu_3O_{7-6}$. $LaBa_2CuCo_2O_8$ prepared above $1000^0C$ adopts a disordered cubic perovskite structure.

Item Type: Journal Article
Publication: Materials Research Bulletin
Publisher: Elsevier Science Ltd.
Additional Information: Copyright of this article belongs to Elsevier Science Ltd.
Keywords: lanthanum;barium;cobalt;copper oxides
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 14 Feb 2008
Last Modified: 19 Sep 2010 04:42
URI: http://eprints.iisc.ac.in/id/eprint/12780

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