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The effect of very high barium content in the precursor on the properties of GdBCO single grain bulk superconductors

Published online by Cambridge University Press:  31 January 2011

Yunhua Shi ,
N. Hari Babu ,
Kazumasa Iida  and
David A. Cardwell
Yunhua Shi*
Affiliation:
Interdisciplinary Research Centre (IRC) in Superconductivity and Department of Engineering, University of Cambridge, Cambridge CB3 0HE, United Kingdom
N. Hari Babu
Affiliation:
Interdisciplinary Research Centre (IRC) in Superconductivity and Department of Engineering, University of Cambridge, Cambridge CB3 0HE, United Kingdom; and Brunel Centre for Advanced Solidification Technology (BCAST), Brunel University, West London UB8 3PH, United Kingdom
Kazumasa Iida
Affiliation:
The Leibniz Institute for Solid State and Materials Research Dresden (IFW)-Dresden, 01069 Dresden, Germany
David A. Cardwell
Affiliation:
Interdisciplinary Research Centre (IRC) in Superconductivity and Department of Engineering, University of Cambridge, Cambridge CB3 0HE, United Kingdom
*
a)Address all correspondence to this author. e-mail: ys206@cam.ac.uk
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Abstract

A new melt processing route for the fabrication of large grain Gd-Ba-Cu-O (GdBCO) bulk superconductors has been developed based on the use of novel GdBa4Cu3O8−δ (Gd-143) and GdBa6Cu3O10−δ (Gd-163) precursor compositions. The new processing route enables the fabrication of large single grains from precursor powders that contain high concentrations of Ba. The superconducting properties and microstructures of GdBCO single grains with extra Ba fabricated via this new processing route are reported. Most importantly, the possible formation of a new form of Gd1+xBa2−xCu3O7−δ solid solution (Gd-123ss) with x < 0 in single grains fabricated from the Ba-rich precursor are discussed for the first time based on the superconducting, chemical, and structural properties of the large GdBCO grains.

Keywords

BaChemical substitutionSuperconducting
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 1 , January 2009 , pp. 10 - 18
Copyright
Copyright © Materials Research Society 2009

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References

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