Effects of drawing and high-pressure sintering on the superconducting properties of (Ba, K)Fe2As2 powder-in-tube wires. (16th November 2015)

• Record Type: Journal Article
• Authors: Pyon, Sunseng; Yamasaki, Yuji; Kajitani, Hideki; Koizumi, Norikiyo; Tsuchiya, Yuji; Awaji, Satoshi; Watanabe, Kazuo; Tamegai, Tsuyoshi
• Is Part Of: Superconductor science & technology. Volume 28:Number 12(2015:Dec.)
• Publication Date: 2015-11-16
• Subjects: superconducting wires -- hot isostatic pressing (HIP) -- (Ba, K)Fe2As2 -- powder-in-tube (PIT) -- critical current density -- effects of drawing and sintering; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/0953-2048/28/12/125014
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: The evolution of the superconducting properties of round wires of (Ba, K)Fe2 As2 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.