Phase chemistry and microstructure evolution in silver-clad (Bi{sub 2-x}Pb{sub x})Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub y} filaments

Conference · Sat Aug 01 04:00:00 EDT 1992

OSTI ID:10178490

Luo, J S; Merchant, N; Maroni, V A; Escorcia-Aparicio, E; Gruen, D M; Tani, B S ^[1]; Riley, Jr, G N; Carter, W L ^[2]

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

The reaction kinetics and mechanism that control the conversion of (Bi,Pb){sub 2}Sr{sub 2}CaCu{sub 2}O{sub z} (Bi-2212) + alkaline earth cuporates to (Bi, Pb){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub y} (Bi-2223) in silver-clad wires were investigated as a function of equilibration temperature and time at a fixed oxygen partial pressure (7.5% O{sub 2}). Measured values for the fractional conversion of Bi-2223 versus time have been evaluated based on the Avrami equation. SEM and TEM studies of partially and fully converted wires have revealed that (1) the growth of Bi-2223 is two-dimensional and controlled by a diffusion process, (2) liquid phases are present during part of the Bi-2212 {minus}> Bi-2212 conversion, and (3) segregation of the second phases occurs in early time domains of the reaction.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10178490
• Report Number(s): ANL/CP--75798; CONF-920802--3; ON: DE92040716
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201
665412
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BISMUTH OXIDES
CALCIUM OXIDES
CHEMICAL AND PHYSICOCHEMICAL PROPERTIES
CHEMICAL REACTION KINETICS
CUPRATES
FILAMENTS
LEAD OXIDES
MICROSTRUCTURE
PHASE STUDIES
SILVER
STRONTIUM OXIDES
STRUCTURE AND PHASE STUDIES
SUPERCONDUCTING DEVICES
SUPERCONDUCTING WIRES
X-RAY DIFFRACTION