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Title: 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.
Inventors:
Issue Date:
OSTI Identifier:
242595
Assignee:
Dept. of Energy, Washington, DC (United States) PTO; SCA: 360201; 360202; PA: EDB-96:093770; SN: 96001600397
Patent Number(s):
US 5,523,285/A/
Application Number:
PAN: 8-315,452
Contract Number:
W-31109-ENG-38
Resource Relation:
Other Information: PBD: 4 Jun 1996
Research Org:
Univ. of Chicago, IL (United States)
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

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