Effects of Bi and Bi{sub 2}O{sub 3} additions on the microstructure and superconducting properties of powder-in-tube BSCCO (2212) tapes

Conference · Sat Oct 01 04:00:00 EDT 1994

OSTI ID:10107022

Guo, J; Lewis, J A ^[1]; Goretta, K C ^[2]

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1. Univ. of Illinois, Urbana, IL (United States). Dept. of Materials Science and Engineering
2. Argonne National Lab., IL (United States)

The microstructural development and superconducting properties of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub x} (Bi-2212) Agclad powder-in-tube tapes with 2 vol% bismuth (Bi) added from either Bi (s) or Bi{sub 2}O{sub 3} powders were investigated. Such additives reduce the peritectic decomposition temperature of pure Bi-2212 by approximately 15-20{approximately}C. Scanning electron microscopy (SEM) and optical microscopy on polished top and cross-sections revealed that the volume fraction of Bi-free phases was lower in the Bi-added specimens relative to those based on pore Bi-2212. In addition, it appeared that the Bi-added samples had improved grain alignment, which was confirmed by x-ray diffraction analysis. Magnetic hysteresis (at 5 K between {+-} 5.5 T) and transport measurements (at 4.2 K) were performed on each specimen. These results showed that Bi-additions yielded superior magnetization critical currents, which is attributed to improved grain alignment and reduced secondary phases.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10107022
• Report Number(s): ANL/ET/CP--84563; CONF-941013--19; ON: DE95004605
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207
BISMUTH ADDITIONS
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
CRITICAL CURRENT
HIGH-TC SUPERCONDUCTORS
HYSTERESIS
MICROSTRUCTURE
POWDER METALLURGY
STRONTIUM OXIDES
SUPERCONDUCTIVITY
SURFACE COATING