Effect of MgO content on the formation and superconducting properties of (Bi, Pb)-2223 phase in the partial-melting and sintering process

X. Y. Lu, A. Nagata, D. Kamio, K. Sugawara, S. Kamada, K. Watanabe, S. Hanada

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The bulk samples with the composition Bi1.8Pb0.4Sr1.9Ca2.1 Cu3.5Oy + x wt.% MgO (x = 0, 0.5, 2, 5, 10 and 15) were prepared by sintering at 840°C for 240 h after partial-melting at 875°C for 1 h. The sample with 0.5 wt.% MgO addition shows the lowest melting temperature of Bi-2212 phase and the highest conversion of Bi-2212 phase to Bi-2223 phase. With increasing MgO content, the width of hysteresis loop ΔM of the bulk samples at 77 K increases (0 ≤ x ≤ 5), and then decreases (5 ≤ x ≤ 15). The largest ΔM appears in the sample with 5 wt.% MgO addition. It is suggested that an amount (∼5 wt.%) of MgO addition in the (Bi, Pb)-2223 superconductors can increase Jc due to improving the flux pinning. In contrast, MgO overdoping (≥5 wt.%) decreases Jc due to decreasing the conversion of Bi-2212 phase to Bi-2223 phase.

Original languageEnglish
Pages (from-to)828-831
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume357-360
DOIs
Publication statusPublished - 2001 Aug

Keywords

  • Bi-2223
  • Flux pining
  • MgO-doping
  • Microstructure
  • Partial-melting

ASJC Scopus subject areas

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

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