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Effect of Oxidizing Atmosphere on Superconductivity in RBa2Cu3−xMxOz

Published online by Cambridge University Press:  28 February 2011

David A. Robinsonem ,
Abbot Maginnis ,
A. Morrobel-Sosa ,
Chester Alexander Jr ,
C. Asavaroengchai ,
Robert M. Metzger  and
Donald A. Stanley
David A. Robinsonem
Affiliation:
Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama,35487–9671
Abbot Maginnis
Affiliation:
U. S. Bureau of Mines, Tuscaloosa Research Center, Tuscaloosa, Alabama, 35486–9777
A. Morrobel-Sosa
Affiliation:
Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama,35487–9671
Chester Alexander Jr
Affiliation:
Department of Physics, The University of Alabama, Tuscaloosa, Alabama, 35487–1921
C. Asavaroengchai
Affiliation:
Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama,35487–9671
Robert M. Metzger
Affiliation:
Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama,35487–9671
Donald A. Stanley
Affiliation:
U. S. Bureau of Mines, Tuscaloosa Research Center, Tuscaloosa, Alabama, 35486–9777
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Abstract

The dependence of the superconducting properties of RBa2Cu3−xMxOz (R = Y, Gd, M = Cr, Mn, Fe, Co, Ni, and x = 0.0, 0.025, 0.05, 0.1, 1.0, 3.0) on the oxidizing environment used during the processing (sintering/annealing) of these materials has been investigated. Samples of nominal composition, YBa2Cu3Oz, were prepared from the same starting materials and subjected to two different controlled heat treatments, under both controlled oxygen and ozone atmospheres. Measurements of ac electrical resistance versus temperature indicate that the critical temperatures are increased, and the widths of the superconducting transitions are narrowed for identically heat-treated samples when processed under ozone atmosphere rather than under an oxygen environment. Thermogravimetric analysis data indicate this trend to be correlated with increased oxygen content and thermal stability. This effect is also observable for materials with metal substitution for Cu, although the measured Tc's are generally lower for increased values of x. X-ray powder diffraction analysis showed the materials to be mostly single phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 587
Copyright
Copyright © Materials Research Society 1988

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References

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