Fabrication and characterization of CaKFe4As4 round wires sintered at high pressure

Sunseng Pyon, Daisuke Miyawaki, Ivan Veshchunov, Tsuyoshi Tamegai, Katsutoshi Takano, Hideki Kajitani, Norikiyo Koizumi, Satoshi Awaji

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We fabricated CaKFe4As4 round wires through a powder-in-tube method followed by hot isostatic pressing up to 175 MPa. The transport critical current density, J c, at 4.2 K almost reached the level for practical applications (100 kA cm-2) under self-field and reached 7.6 kA cm-2 at 100 kOe. Magneto-optical images confirmed that the grains were well-connected at low temperatures. Although high-pressure sintering at high temperatures enhanced the J c and density of the core of the wires, X-ray diffraction and scanning electron microscopy-energy-dispersive X-ray spectroscopy analyses indicated that impurity phases were present in both the polycrystalline powder and the core of the wire.

Original languageEnglish
Article number123101
JournalApplied Physics Express
Volume11
Issue number12
DOIs
Publication statusPublished - 2018 Dec

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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    Pyon, S., Miyawaki, D., Veshchunov, I., Tamegai, T., Takano, K., Kajitani, H., Koizumi, N., & Awaji, S. (2018). Fabrication and characterization of CaKFe4As4 round wires sintered at high pressure. Applied Physics Express, 11(12), [123101]. https://doi.org/10.7567/APEX.11.123101