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Thermal conversion of gels to YBa2Cu3Ox, Bi2Sr2CaCu2Ox, and (Bi, Pb)2Sr2Ca2Cu3Ox and their decarbonization by low-temperature treatment with nitric acid

Published online by Cambridge University Press:  31 January 2011

A. Deptula ,
T. Olczak ,
W. Lada ,
K. C. Goretta ,
A. Di Bartolomeo  and
A. Brignocchi
A. Deptula
Affiliation:
Institute of Nuclear Chemistry and Technology, 03–195 Warsaw, Poland
T. Olczak
Affiliation:
Institute of Nuclear Chemistry and Technology, 03–195 Warsaw, Poland
W. Lada
Affiliation:
Institute of Nuclear Chemistry and Technology, 03–195 Warsaw, Poland
K. C. Goretta
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, Illinois, 60439-4838
A. Di Bartolomeo
Affiliation:
C.R.E. Casaccia, ENEA, Rome, Italy
A. Brignocchi
Affiliation:
C.R.E. Casaccia, ENEA, Rome, Italy
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Abstract

Thermal conversion of acetate-derived gels to YBa2Cu3Ox (Y–123), Bi2Sr2CaCu2Ox (Bi–2212), and (Bi, Pb)2Sr2Ca2Cu3Ox (Bi-2223) has been studied by thermal analysis, x-ray diffraction, and infrared spectroscopy. Carbonates formed above 200 °C during thermal treatment of all gels. Decomposition of the carbonates proved to be more difficult for Y-123 than for Bi-2212 or Bi-2223. However, all of the gels that were heated contained significant amounts of carbon after calcination. Complete decarbonization of materials was attained by treating the intermediate phases (e.g., those formed after calcination at 600 °C) with nitric acid and then subjecting them to a final thermal treatment. Removal of carbonates from the intermediate phases strongly accelerated formation of the superconducting compounds.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 1 , January 1996 , pp. 1 - 4
Copyright
Copyright © Materials Research Society 1996

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