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Synthesis and Structure of $PrBa_2Cu_2Co_1O_{7+y}$: A New Nonsuperconducting Orthorhombic 123 System

Hegde, MS and Ramesh, S and Panchapagesan, TS (1993) Synthesis and Structure of $PrBa_2Cu_2Co_1O_{7+y}$: A New Nonsuperconducting Orthorhombic 123 System. In: Journal of Solid State Chemistry, 102 (2). pp. 306-314.

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Abstract

$PrBa_2Cu_{3-x}Co_xO_{7+y}$(0 < x < 1) crystallizes in tetragonal structure for small values of .t (O.I < x < 0,3) and in orthorhombic structure for 0.4 < x < I, as revealed by X-ray and electron diffraction studies. The end member $PrBa_2Cu_2CoO_{7.4}$ shows orthorhombic to tetragonal structural transition with decrease in oxygen content just as $YBa_2Cu_3O_{7-y}$(l23) and $PrBa_2Cu_3O_{7-y}$(Prl23). From the structure and reactivity, the Co ion in $PrBa_2Cu_2CoO_{7+y}$ is suggested to occupy the Cu(2) (plane Cu) position and the oxygen excess over 7 to occupy the (0,0,1/2) position between the $CuO_2-CuO_2 (CoO_2)$ sheets. The structure supports two types of labile oxygen, one associated with the chain Cu(l)and the other in the interlayer associated with the Co ion, as revealed by anaerobic oxidation of ammonia.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 12 Oct 2006
Last Modified: 19 Sep 2010 04:31
URI: http://eprints.iisc.ernet.in/id/eprint/8360

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