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Synthesis of YBa2Cu3O7−δ with clean grain boundaries by a modified aerosol decomposition process

Published online by Cambridge University Press:  31 January 2011

Yuan-Liang Wang ,
Z.Q. Tan ,
Yimei Zhu ,
A.R. Moodenbaugh  and
M. Suenaga
Yuan-Liang Wang
Affiliation:
Materials Science Division, Brookhaven National Laboratory, Upton, New York 11973-5000
Z.Q. Tan
Affiliation:
Materials Science Division, Brookhaven National Laboratory, Upton, New York 11973-5000
Yimei Zhu
Affiliation:
Materials Science Division, Brookhaven National Laboratory, Upton, New York 11973-5000
A.R. Moodenbaugh
Affiliation:
Materials Science Division, Brookhaven National Laboratory, Upton, New York 11973-5000
M. Suenaga
Affiliation:
Materials Science Division, Brookhaven National Laboratory, Upton, New York 11973-5000
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Abstract

A modified aerosol decomposition method was developed for producing sintered YBa2Cu3O7−δ (1-2-3) pellets having sharp superconducting transition Tc's at ∼90 K, fine grain sizes, and clean grain boundaries. This method used “precursor” powders, which were produced with an aerosol flow reactor at 550 °C, instead of in situ produced 1-2-3 powders commonly processed at 880–1000 °C. As determined by x-ray absorption and powder diffraction studies, the 1-2-3 powders produced by the modified route contain less cation disorders than the in situ produced powders. The disorder is speculated to be the cause of Tc-suppression and broadening. It cannot be removed unless high sintering temperatures were used (>950 °C), which resulted in large grains and impurities and cracks at grain boundaries.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 12 , December 1992 , pp. 3175 - 3184
Copyright
Copyright © Materials Research Society 1992

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