Rapid formation of phase-clean 110 K (Bi-2223) powders derived via freeze-drying process
Patent
·
OSTI ID:870443
- Hinsdale, IL
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.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- DOE Contract Number:
- W-31109-ENG-38
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 5523285
- OSTI ID:
- 870443
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
/505/252/
110
2223
amorphous
appear
bi-2223
boundaries
clean
contact
cu
denitrated
denitrating
derived
dried
dried powder
dry
drying process
flakes
form
formation
freeze-drying
freeze-drying process
freezing
frozen
grain
grain boundaries
grains
green
green-powders
grinding
heating
incorporating
intergrain
leading
nitrate
nitrate solution
pb
pb-doped
phase
phase separation
phase-clean
powder
powders
precursor
precursor powder
precursor powders
preparation
process
rapid
separation
solution
splat
splat-freezing
sr
step
via
110
2223
amorphous
appear
bi-2223
boundaries
clean
contact
cu
denitrated
denitrating
derived
dried
dried powder
dry
drying process
flakes
form
formation
freeze-drying
freeze-drying process
freezing
frozen
grain
grain boundaries
grains
green
green-powders
grinding
heating
incorporating
intergrain
leading
nitrate
nitrate solution
pb
pb-doped
phase
phase separation
phase-clean
powder
powders
precursor
precursor powder
precursor powders
preparation
process
rapid
separation
solution
splat
splat-freezing
sr
step
via