Rapid formation of phase-clean 110 K (Bi-2223) powders derived via freeze-drying process
Abstract
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.
- Inventors:
- Issue Date:
- Research Org.:
- Univ. of Chicago, IL (United States)
- OSTI Identifier:
- 242595
- Patent Number(s):
- 5523285
- Application Number:
- PAN: 8-315,452
- Assignee:
- Dept. of Energy, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- Resource Type:
- Patent
- Resource Relation:
- Other Information: PBD: 4 Jun 1996
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; LEAD OXIDES; SYNTHESIS; GRAIN BOUNDARIES; BISMUTH OXIDES; STRONTIUM OXIDES; CALCIUM OXIDES; COPPER OXIDES; PRECURSOR
Citation Formats
Balachandran, U. Rapid formation of phase-clean 110 K (Bi-2223) powders derived via freeze-drying process. United States: N. p., 1996.
Web.
Balachandran, U. Rapid formation of phase-clean 110 K (Bi-2223) powders derived via freeze-drying process. United States.
Balachandran, U. Tue .
"Rapid formation of phase-clean 110 K (Bi-2223) powders derived via freeze-drying process". United States.
@article{osti_242595,
title = {Rapid formation of phase-clean 110 K (Bi-2223) powders derived via freeze-drying process},
author = {Balachandran, U},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jun 04 00:00:00 EDT 1996},
month = {Tue Jun 04 00:00:00 EDT 1996}
}
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