Processing chemically prepared YBa/sub 2/Cu/sub 3/O/sub 7/ precursor powders
Conference
·
OSTI ID:6507058
In an effort to determine the optimum conditions for preparing high purity, fine particle size high temperature superconducting oxide powder, we have investigated how calcination conditions influence the conversion of a chemically prepared hydroxycarbonate precursor powder to YBa/sub 2/Cu/sub 3/O/sub 7/. We find that the precursor can be converted to phase pure YBa/sub 2/Cu/sub 3/O/sub 7/ in either oxygen or synthetic air (20% O/sub 2/, 80% N/sub 2/) at 850/degree/C. This temperature is substantially lower than the temperature (>900/degree/C) normally used for the calcination of mixed-oxide powders. The lower calcination temperature prevents particle sintering and maintains the desired fine particle size. Powder processed in synthetic air shows a low degree of crystallinity indicating it may be more sinterable than the highly crystalline powders produced when an oxygen atmosphere is used. Intimate contact between powder particle surfaces and a flowing gas atmosphere promotes the reaction between the BaCO/sub 3/ component of the precursor powder and the Y and Cu constituents. 9 refs., 4 figs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6507058
- Report Number(s):
- SAND-88-3196C; CONF-890251-1; ON: DE89005604
- Country of Publication:
- United States
- Language:
- English
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Preparation of orthorhombic Ba sub 2 YCu sub 3 O sub 7 powder by single-step calcining
Conference
·
Tue Oct 31 23:00:00 EST 1989
·
OSTI ID:5363898
Reaction pathways for the formation of the YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ compound
Journal Article
·
Tue Feb 28 23:00:00 EST 1989
· J. Mat. Res.; (United States)
·
OSTI ID:6183368
Preparation of orthorhombic Ba sub 2 YCu sub 3 O sub 7 powder by single-step calcining
Journal Article
·
Wed Jan 31 23:00:00 EST 1990
· Journal of the American Ceramic Society; (USA)
·
OSTI ID:6888357
Related Subjects
36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360601 -- Other Materials-- Preparation & Manufacture
360603 -- Materials-- Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM CARBONATES
BARIUM COMPOUNDS
BARIUM OXIDES
CALCINATION
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL GROWTH
DECOMPOSITION
DIFFRACTION
FABRICATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POWDERS
PYROLYSIS
SCATTERING
SINTERING
SUPERCONDUCTORS
SYNTHESIS
THERMAL ANALYSIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360601 -- Other Materials-- Preparation & Manufacture
360603 -- Materials-- Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM CARBONATES
BARIUM COMPOUNDS
BARIUM OXIDES
CALCINATION
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL GROWTH
DECOMPOSITION
DIFFRACTION
FABRICATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POWDERS
PYROLYSIS
SCATTERING
SINTERING
SUPERCONDUCTORS
SYNTHESIS
THERMAL ANALYSIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES