Enhancement of critical current density in (Ba,Na)Fe2As2 round wires using high-pressure sintering

Sunseng Pyon, Daisuke Miyawaki, Tsuyoshi Tamegai, Satoshi Awaji, Hijiri Kito, Shigeyuki Ishida, Yoshiyuki Yoshida

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


We fabricated (Ba,Na)Fe2As2 superconducting wires using the powder-in-tube method and hot isostatic pressing. By improving powder synthesis processes compared with previous studies, highly pure raw materials for the wire fabrication were obtained. The largest transport critical current density (J c) reached 40 kA cm-2 at T = 4.2 K under a magnetic field of 100 kOe. This value exceeds not only the value of transport J c of the previous (Ba,Na)Fe2As2 wire but also those of all iron-based superconducting round wires. Improvements of polycrystalline powder synthesis play a key role for the enhancement of J c. Furthermore, it was clarified that higher densification by high-pressure sintering and the texturing of grains in the core of the wire due to drawing also increased J c effectively. Advantages of (Ba,Na)Fe2As2 wires compared with (Ba,K)Fe2As2 wires are also discussed.

Original languageEnglish
Article number065001
JournalSuperconductor Science and Technology
Issue number6
Publication statusPublished - 2020 Jun 1


  • (Ba,Na)FeAs
  • HIP
  • critical current density
  • iron-based superconducting round wires
  • powder-in-tube

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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