Synthesis and microstructure of the 2223 phase (Bi{sub 2.0}Sr{sub 2.0}Ca{sub 2.0}Cu{sub 3.0}O{sub x}) in the (Bi,Pb)-Sr-Ca-Cu-O system obtained from freeze dried precursors
Book
·
OSTI ID:43015
- Univ. of Pittsburgh, PA (United States). Dept. of Materials Science and Engineering
- Argonne National Lab., IL (United States). Energy Technology Division
Amorphous precursor powders for Bi{sub 1.8}Pb{sub 0.4}Sr{sub 2}Ca{sub 2.2}Cu{sub 3}O{sub x} and Bi{sub 1.8}Pb{sub 0.4}Sr{sub 2}Ca{sub 2.0}Cu{sub 3}0{sub x} (2223) were prepared by a freeze-drying process incorporating a splat-freezing step. The critical parameters affecting the drying process are discussed. The freeze-dried powders have high reactivity and led to essentially phase pure 2223 phase formation in 12 hr. The microstructure of the 2223 shows fine coherent particles of 2201 in the matrix. The grain boundaries of the 2223 grains appear to be clean, leading to good intergrain contact between 2223 grains. It was shown that both lead content and oxygen partial pressure affected liquid-phase formation. Lead content affected dissolution of the 2212 phase into the liquid phase from which the 2223 high-{Tc} superconducting phase is formed.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 43015
- Report Number(s):
- CONF-9310224--; ISBN 0-87339-271-X
- Country of Publication:
- United States
- Language:
- English
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