Effect of biaxial cold pressure densification (BCPD) on Ba0.6K0.4Fe2As2 round wire using optimized precursor

• Published in: Ceramics international Vol. 44; no. 4; pp. 4457 - 4461
• Main Authors: Li, X., Collings, E.W., Wan, F., Sumption, M.D., Xue, S.C., Zhang, D.L., Rindfleisch, M.A., Tomsic, M.J., Shi, Z.X.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-03-2018
• Subjects: Ba0.6K0.4Fe2As2 superconductor; Biaxial cold pressure densification; Powder preparation and optimization; Superconductivity; Biaxial cold pressure densification; Powder preparation and optimization; Ba0.6K0.4Fe2As2 superconductor; Superconductivity
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2017.11.111

(Ba,Sr)1-xKxFe2As2 superconductor is of great interest as a wire for practical applications. In this paper, Ba0.6K0.4Fe2As2 precursor powder was prepared by high-energy ball-milling aided sintering (12h/750°C). The prepared precursor was drawn to powder-in-tube round wire. Partial as-drawn wires were subjected to biaxial cold pressure densification (BCPD) at 0.5 and 1.0GPa, followed by an annealing for 1min/770°C. According to our results, the BCPD improved the grain connectivity of the BCPDed wires without degrading the superconductivity. A (Ba,Sr)1-xKxFe2As2 round-wire record transport critical current density, 1.14 × 105A/cm2 (4.2K, 2T), was observed in our BCPDed samples.
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