Effects of Bi and Bi2O3 Additions on the Microstructure and Superconducting Properties of Powder-in-tube BSCCO (2212) Tapes

J. Guo, K. C. Goretta, J. A. Lewis

Research output: Contribution to journalArticlepeer-review

Abstract

The microstructural development and superconducting properties of Bi2Sr2CaCu2Ox (Bi-2212) Ag-clad powder-in-tube tapes with 2 vol% bismuth (Bi) added from either Bi(s) or Bi2O3 powders were investigated. Such additives reduce the peritectic decomposition temperature of pure Bi-2212 by approximately 15-20°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 pure 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.

Original languageEnglish (US)
Pages (from-to)1860-1863
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume5
Issue number2
DOIs
StatePublished - Jun 1995

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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