Effects of drawing and high-pressure sintering on the superconducting properties of (Ba,K)Fe2As2 powder-in-tube wires

Sunseng Pyon, Yuji Yamasaki, Hideki Kajitani, Norikiyo Koizumi, Yuji Tsuchiya, Satoshi Awaji, Kazuo Watanabe, Tsuyoshi Tamegai

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

The evolution of the superconducting properties of round wires of (Ba,K)Fe2As2 fabricated by the powder-in-tube (PIT) method is systematically studied. After establishing the method to obtain the largest transport critical current density (J c) in round wires using the hot isostatic press technique, we investigated how the transition temperature (T c), J c, and microstructures change at each step of the wire fabrication. Unexpectedly, we find that superconducting properties of the wire core are significantly damaged by the drawing process. Systematic measurements of J c and T c of the core superconductor after each drawing and sintering process clarified the evolution of degradation by the drawing process and recovery by heat treatment.

Original languageEnglish
Article number125014
JournalSuperconductor Science and Technology
Volume28
Issue number12
DOIs
Publication statusPublished - 2015 Nov 16

Keywords

  • (Ba,K)FeAs
  • critical current density
  • effects of drawing and sintering
  • hot isostatic pressing (HIP)
  • powder-in-tube (PIT)
  • superconducting wires

ASJC Scopus subject areas

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

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