Melt processing of the Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub y] superconductor in oxygen and argon atmospheres
- Argonne National Lab., IL (United States)
- Ames Lab., IA (United States)
Solidification and subsequent annealing of Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub y] (2212) in oxygen and argon atmospheres were investigated in order to identify alternative processing routes for controlling microstructures and superconducting properties. In addition to 2212, several other phases formed on cooling in O[sub 2] and did not disappear upon subsequent annealing. Crystallization in Ar resulted in a divorced eutetic structure of Bi[sub 2]Sr[sub 3-x]Ca[sub x]O[sub y] and Cu[sub 2]O/CuO. The superconductor was formed on subsequent anneals. Samples melted in Ar and then annealed generally possessed a more uniform microstructure compared with samples that were melted in oxygen and annealed. Compositional measurements of the 2212 phase suggest that CaO segregation in the melt may be minimized with an overall composition such as Bi[sub 2.15]Sr[sub 2]Ca[sub 0.85]Cu[sub 2]O[sub y].
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE; National Science Foundation (NSF); USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38; W-7405-ENG-82
- OSTI ID:
- 7134578
- Report Number(s):
- ANL/CP-77532; CONF-920802-31; ON: DE93002999; CNN: DMR-8809854
- Resource Relation:
- Conference: Applied superconductivity conference, Chicago, IL (United States), 23-28 Aug 1992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
MATERIALS
PROCESSING
SUPERCONDUCTORS
ANNEALING
ARGON
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
COPPER COMPOUNDS
MELTING
OXIDES
OXYGEN
STRONTIUM COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
ELEMENTS
FLUIDS
GASES
HEAT TREATMENTS
NONMETALS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RARE GASES
TRANSITION ELEMENT COMPOUNDS
665412* - Superconducting Devices- (1992-)
360201 - Ceramics
Cermets
& Refractories- Preparation & Fabrication