Rapid formation of phase-clean 110 K (Bi-2223) powders derived via freeze-drying process
A process for the preparation of amorphous precursor powders for Pb-doped Bi{sub 2}Sr{sub 2} Ca{sub 2}Cu{sub 3}O{sub x} (2223) includes a freeze-drying process incorporating a splat-freezing step. The process generally includes splat freezing a nitrate solution of Bi, Pb, Sr, Ca, and Cu to form flakes of the solution without any phase separation; grinding the frozen flakes to form a powder; freeze-drying the frozen powder; heating the dried powder to form a dry green precursor powders; denitrating the green-powders; heating the denitrated powders to form phase-clean Bi-2223 powders. The grain boundaries of the 2223 grains appear to be clean, leading to good intergrain contact between 2223 grains. 11 figs.
- Research Organization:
- Univ. of Chicago, IL (United States)
- DOE Contract Number:
- W-31109-ENG-38
- Assignee:
- Dept. of Energy, Washington, DC (United States)
- Patent Number(s):
- US 5,523,285/A/
- Application Number:
- PAN: 8-315,452
- OSTI ID:
- 242595
- Resource Relation:
- Other Information: PBD: 4 Jun 1996
- 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
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