Rapid formation of the 110 K phase in Bi-Pb-Sr-Ca-Cu-O through freeze-drying powder processing
- School of Materials Science and Engineering, Univ. of New South Wales, Kensington, New South Wales 2033 (AU)
This paper reports three techniques for processing Bi-Pb-Sr-Ca-Cu-O (BPSCCO) powders investigated: dry-mixing, sol-gel formation, and freeze-drying. It was found that sintering for 120 h at 850{degrees}C is required to form nearly single-phase (Bi,Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10{minus}{ital y}} by dry-mixing, whereas sintering for 30 h at 840{degrees}C was sufficient to form the 110 K (2223) phase when freeze-drying was used. The sol-gel route was found to be intermediate in efficiency between these two techniques. Freeze-drying provided highly reactive, intimately mixed, and carbon-free precursors. The presence of carbonates in the uncalcined powders was the major cause of phase segregation and sluggishness of the 110 K phase formation.
- OSTI ID:
- 6484019
- Journal Information:
- Journal of the American Ceramic Society; (USA), Vol. 73:6; ISSN 0002-7820
- Country of Publication:
- United States
- Language:
- English
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Rapid formation of phase-clean 110 K (Bi-2223) powders derived via freeze-drying process
Rapid formation of phase-clean 110 K (Bi-2223) powders derived via freeze-drying process
Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BISMUTH COMPOUNDS
FREEZING
HIGH-TC SUPERCONDUCTORS
FABRICATION
CALCIUM OXIDES
CHEMICAL COMPOSITION
COPPER OXIDES
LEAD OXIDES
MIXTURES
PHASE STUDIES
POWDER METALLURGY
PRECURSOR
SINTERING
SOL-GEL PROCESS
STRONTIUM OXIDES
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
DISPERSIONS
LEAD COMPOUNDS
METALLURGY
OXIDES
OXYGEN COMPOUNDS
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
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