Design of a 30 T superconducting Magnet using a coated conductor insert

Kei Koyanagi, Michitaka Ono, Satoshi Hanai, Kazuo Watanabe, Satoshi Awaji, Takataro Hamajima, Tsukasa Kiyoshi, Hiroaki Kumakura

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


submicrometer platinum doping Large grain YBCO superconductors, containing the same atomic percentage of Ce, and that of Pt, were produced via the melt-texturing process. Samples doped with nanometer cerium oxide exhibits an approximate 30% increase in trapped magnetic flux density, relative to submicrometer platinum doped YBCO. A 30% increase in trapped magnetic flux density represents ∼80% increase in critical current density. Microstructure studies indicate that just like Pt, Ce refines Y211 particles to increase trapped magnetic flux density and critical current density. Cerium is much cheaper than platinum and is therefore, a desirable alternative to Pt in the large-scale production of bulk YBCO superconductors. Another interesting result of this experiment is that the trapped magnetic flux density of Ce-doped samples is unchanging over a large range of melting temperatures used for melt-texturing. In addition to refined Y211, Ce-rich deposits are also formed. The Ce-rich particles are insufficient in number to act as effective pinning centers.

Original languageEnglish
Article number4982597
Pages (from-to)1617-1620
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Publication statusPublished - 2009 Jun


  • Enhancement in critical current density
  • Melt-textured high temperature superconductors
  • Nanometer cerium oxide doping

ASJC Scopus subject areas

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


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