# Transformation of the Oxygen - Deficient 123 Cuprates, $LnBa_2Cu_3O_{7-\delta}(Ln=Nd, Gd, Dy, Er;0.3\leq \delta\leq0.4)$, to a 124-type Structure on Low-Temperature Annealing

Bhat, KM and Gundakaram, Ravichandra and Subbanna, GN and Ganguli, AK (1995) Transformation of the Oxygen - Deficient 123 Cuprates, $LnBa_2Cu_3O_{7-\delta}(Ln=Nd, Gd, Dy, Er;0.3\leq \delta\leq0.4)$, to a 124-type Structure on Low-Temperature Annealing. In: Solid State Communications, 95 (9). pp. 629-633.

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## Abstract

X-ray diffraction patterns of superconducting $LnBa_2Cu_30_{7-\delta}$ (Ln = Nd, Gd, Dy or Er) compositions $(0.3 \leq \delta \leq 0.4;T_c 45-60K)$, show a significant change on annealing bulk samples at 473K for 46-60 hr6. The diffraction patterns of the annealed samples are very simple, with a low angle reflection corresponding to a c parameter of \sim 27 \AA, similar to that of 124 cuprates. The annealed product has a highly disordered structure, but contains lamellae of the 124 structure, as confirmed by electron microscopy.

Item Type: Journal Article Copyright of this article belongs to Elsevier. Division of Chemical Sciences > Materials Research Centre 28 Jun 2007 19 Sep 2010 04:35 http://eprints.iisc.ernet.in/id/eprint/9881