Demonstration of excellent Jc Performance in (AE,Na)Fe2As2 (AE: Sr, Ba) PIT Wires

Tsuyoshi Tamegai, Takahiro Suwa, Daisuke Miyawaki, Sunseng Pyon, Katsutoshi Takano, Hideki Kajitani, Norikiyo Koizumi, Satoshi Awaji

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Na-substituted 122-type iron-based superconductors were synthesized and fabricated into superconducting tapes and wires. Good Jc performance of Ag-sheathed Sr0.45Na0.55Fe2As2 pressed tapes was demonstrated, and it was further improved by using AgSn as a sheath material. The improved Jc characteristics are due to the reduction of the optimum sintering temperature by ∼100 °C, which suppressed the reaction between the sheath and the core. However, the fabrication of good Sr0.45Na0.55Fe2As2 round wire using the hot isostatic press method failed, due possibly to the segregation of Na in the core. To avoid the segregation of Na, we fabricated round wires employing (Ba,Na)Fe2As2 rather than underdoped (Sr,Na)Fe2As2. Jc in Ba0.6Na0.4Fe2As2 round wire processed 700 °C under the pressure of 175 MPa reached 1.5 × 105 and 2.0 × 104 A/cm2 at self-field and 100 kOe, respectively. These values are more than fifty percent of the largest Jc in (Ba,K)Fe2As2 round wires, demonstrating the excellent performance of (Ba,Na)Fe2As2 wires.

Original languageEnglish
Article number8667380
JournalIEEE Transactions on Applied Superconductivity
Issue number5
Publication statusPublished - 2019 Aug


  • Critical current density
  • high-temperature superconductors
  • superconducting filaments and wires
  • type II superconductors

ASJC Scopus subject areas

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


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