Improved processing of ceramic superconductors

Conference · Sun Oct 01 04:00:00 EDT 1989

OSTI ID:6909189

Poeppel, R B; Balachandran, U; Emerson, J E; Johnson, S A; Lanagan, M T; Youngdahl, C A ^[1]; Eror, N G ^[2]

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1. Argonne National Lab., IL (USA)
2. Pittsburgh Univ., PA (USA)

Vacuum calcination of precursor powder under controlled total oxygen pressure has been investigated for synthesizing YBa{sub 2}Cu{sub 3}O{sub x} (YBCO) superconductor. The reaction temperature, {approximately}800{degree}C, is {approximately}100{degree}C lower than that used in ambient-pressure calcination. Since a single calcination results in essentially phase-pure material, total calcination times have been drastically reduced. The vacuum-calcined powder has finer particles and consequently greater sinterability than powders made by conventional methods. Samples made from this powder have critical current densities of {approximately}1000 A/cm{sup 2} at 77 K in zero applied external magnetic field. 14 refs., 4 figs.

• Research Organization: Argonne National Lab., IL (USA)
• Sponsoring Organization: DOE/CE
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6909189
• Report Number(s): CONF-8910120-10; ON: DE90009721
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
426001* -- Engineering-- Superconducting Devices & Circuits-- (1990-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCINATION
CERAMICS
CHALCOGENIDES
CHEMICAL REACTIONS
COMMINUTION
CONCENTRATION RATIO
CONTROL
COOLING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
CURRENT DENSITY
DECOMPOSITION
DIFFUSION
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EQUILIBRIUM
FABRICATION
FOURIER TRANSFORMATION
FURNACES
GRINDING
HOMOGENEOUS MIXTURES
INTEGRAL TRANSFORMATIONS
MACHINING
MAGNETIC FIELDS
MELTING
MIXTURES
OPTIMIZATION
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POLYCRYSTALS
POWDERS
PRESSURE EFFECTS
PROCESS CONTROL
PYROLYSIS
SAMPLING
SINTERING
SLURRIES
SUPERCONDUCTIVITY
SUSPENSIONS
SYNTHESIS
TEMPERATURE EFFECTS
THERMAL ANALYSIS
THERMOCHEMICAL PROCESSES
THERMODYNAMICS
TRANSFORMATIONS
TRANSITION ELEMENT COMPOUNDS
VACUUM SYSTEMS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES