Tl sub 2 Ca sub 1 Ba sub 2 Cu sub 2 O sub 8+ x high Tc superconductors processed by the sol-gel technique
- Science and Technology Center for Superconductivity, Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL (USA)
Tl{sub 2}Ca{sub 1}Ba{sub 2}Cu{sub 2}O{sub 8+{ital x}} high {Tc} superconductors were developed using a new alkoxide sol-gel system. Barium-, calcium-, thallium-methoxyethoxide and Cu(II) ethoxide precursors were used for the formation of homogeneous sols. Solubility of the Cu(II) ethoxide was aided by using a 2-methoxyethanol/methyl ethylketone/toluene solvent system. The sols were characterized by small-angle x-ray scattering and transmission electron microscopy. The average particle size was 50 nm and the fractal dimension of these particles was 1.8. Powders were produced by rotary evaporation followed by thermal treatment in a closed container with excess thallium at 900 {degree}C for various calcination times. Powders were characterized by x-ray diffraction, resistivity, and magnetic susceptibility measurements, and chemical analysis. Samples exhibited transition temperatures between 100 and 110 K depending upon the processing conditions.
- OSTI ID:
- 6388149
- Journal Information:
- Applied Physics Letters; (USA), Vol. 57:14; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BARIUM OXIDES
PHYSICAL PROPERTIES
CALCIUM OXIDES
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
SYNTHESIS
SOL-GEL PROCESS
USES
THALLIUM OXIDES
ELECTRIC CONDUCTIVITY
EXPERIMENTAL DATA
MAGNETIC SUSCEPTIBILITY
POWDER METALLURGY
QUANTITATIVE CHEMICAL ANALYSIS
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL ANALYSIS
COHERENT SCATTERING
COPPER COMPOUNDS
DATA
DIFFRACTION
ELECTRICAL PROPERTIES
INFORMATION
MAGNETIC PROPERTIES
METALLURGY
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SCATTERING
SUPERCONDUCTORS
THALLIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360204 - Ceramics
Cermets
& Refractories- Physical Properties