Thermostability and decomposition of the (Bi,Pb) sub 2 Sr sub 2 Ca sub 2 Cu sub 3 O sub 10 phase in silver-clad tapes
- Argonne National Laboratory, Argonne, Illinois 60439 (United States)
- American Superconductor Corporation, Watertown, Massachusettes 02172 (United States)
The stability of the Bi{sub 2{minus}{ital x}}Pb{sub {ital x}}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10} (Pb-2223) phase contained in silver-sheathed oxide-powder-in-tube specimens has been investigated by x-ray diffraction, transmission electron microscopy, and energy dispersive x-ray analysis. Silver tubes loaded with Pb-2223 precursor powders were processed into tapes using established metallurgical techniques. The tapes were heat-treated in a specially designed equilibration apparatus at selected temperatures (800--845 {degree}C) for a range of times (10--5500 min) and quenched in liquid gallium held at {similar to}40 {degree}C. The results showed that the Pb-2223 phase is stable in a limited temperature interval between 810 and 830 {degree}C in 7.5% oxygen. At 800 {degree}C, this phase decomposes to Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} (2212), Ca{sub 2}PbO{sub 4}, and CuO; while at temperatures {ge}840 {degree}C it partially melts with precipitation of Bi{sub 2}Sr{sub 2}CuO{sub 6} (2201) and Ca{sub 2}CuO{sub 3}. The effects of the silver cladding on the Pb-2223 phase stability and microstructure are also discussed.
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 7266734
- Journal Information:
- Journal of Applied Physics; (United States), Journal Name: Journal of Applied Physics; (United States) Vol. 72:6; ISSN 0021-8979; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CABLES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CLADDING
CONDUCTOR DEVICES
COPPER COMPOUNDS
COPPER OXIDES
DECOMPOSITION
DEPOSITION
ELECTRIC CABLES
ELECTRICAL EQUIPMENT
ELEMENTS
EQUIPMENT
HEAT TREATMENTS
HIGH-TC SUPERCONDUCTORS
LEAD COMPOUNDS
LEAD OXIDES
METALS
OXIDES
OXYGEN COMPOUNDS
PHASE STABILITY
PHASE STUDIES
PRECIPITATION
SEPARATION PROCESSES
SILVER
STABILITY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTING CABLES
SUPERCONDUCTORS
SURFACE COATING
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS