Thermal conversion of gels to YBa{sub 2}Cu{sub 3}O{sub {ital x}}, Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub {ital x}}, and (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital x}} and their decarbonization by low-temperature treatment with nitric acid
- Institute of Nuclear Chemistry and Technology, 03-195 Warsaw (Poland)
- Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439-4838 (United States)
- C. R. E. Casaccia, ENEA, Rome (Italy)
Thermal conversion of acetate-derived gels to YBa{sub 2}Cu{sub 3}O{sub {ital x}} (Y{endash}123), Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub {ital x}} (Bi{endash}2212), and (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub {ital x}} (Bi-2223) has been studied by thermal analysis, x-ray diffraction, and infrared spectroscopy. Carbonates formed above 200{degree}C during thermal treatment of all gels. Decomposition of the carbonates proved to be more difficult for Y-123 than for Bi-2212 or Bi2223. 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{degree}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. {copyright} {ital 1996 Materials Research Society.}
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 278467
- Journal Information:
- Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 1 Vol. 11; ISSN JMREEE; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
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