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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 ·
OSTI ID:7165012
; ; ; ; ;  [1]; ;  [2]
  1. Argonne National Lab., IL (United States)
  2. American Superconductor Corp., Watertown, MA (United States)
+ Show Author Affiliations
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:
DOE; USDOE, Washington, DC (United States)
DOE Contract Number:
W-31109-ENG-38
OSTI ID:
7165012
Report Number(s):
ANL/CP-75798; CONF-920802--3; ON: DE92040716
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
665412 -- Superconducting Devices-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
COHERENT SCATTERING
COPPER COMPOUNDS
CRYSTAL STRUCTURE
CUPRATES
DIFFRACTION
ELEMENTS
FILAMENTS
KINETICS
LEAD COMPOUNDS
LEAD OXIDES
METALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
REACTION KINETICS
SCATTERING
SILVER
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTING WIRES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WIRES
X-RAY DIFFRACTION