A study of parameters that influence growth and stability of the (Bi{sub 1{minus}x}Pb{sub x}){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub y} phase

Conference · Wed Apr 01 04:00:00 EST 1992

OSTI ID:10150128

Luo, J S; Merchant, N; Maroni, V A; Gruen, D M; Tani, B S ^[1]; Carter, W L; Riley, Jr, G N; Sandhage, K H ^[2]

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1. Argonne National Lab., IL (United States)
2. American Superconductor Corp., Watertown, MA (United States)

The growth and stability of the (Bi{sub 1-x}Pb{sub x}){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub y} (Bi-2223) phase contained in silver-sheathed wires has been investigated by a combination of x-ray diffraction, scanning electron microscopy, energy dispersive x-ray analysis, and transmission electron microscopy. Silver tubes loaded with Bi-2223 precursor powders were processed into filaments using established metallurgical techniques. The filaments were then heat-treated at selected temperatures (800 to 845{degrees}C) for a range of times (10 to 6000 min) in a 7.5% oxygen atmosphere. From these studies it has been possible to investigate the time-temperature-oxygen pressure domains wherein Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} (Bi-2212) + second phases transform to Bi-2223. Fractional conversion (Bi-2212) {yields} (Bi-2223) versus time data show good conformance to the kinetic model for a diffusion-controlled reaction at the interface between thin sheets and a fine powder or a fluid. Quenching experiments also reveal that the Bi-2223 phase is stable in a limited temperature interval between 810 and 830{degrees}C.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10150128
• Report Number(s): ANL/CP--73655; CONF-920402--23; ON: DE92015187
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201
360202
665412
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
FILAMENTS
HIGH-TC SUPERCONDUCTORS
LEAD OXIDES
PHASE STABILITY
PREPARATION AND FABRICATION
SCANNING ELECTRON MICROSCOPY
SILVER
STRONTIUM OXIDES
STRUCTURE AND PHASE STUDIES
SUPERCONDUCTING DEVICES
SUPERCONDUCTING WIRES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION