(Ba,Sr) 1- x K x Fe 2 As 2 superconductor is of great interest as a wire for practical applications. In this paper, Ba 0.6 K 0.4 Fe 2 As 2 precursor powder was prepared by high-energy ball-milling aided sintering (12 h/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 1.0 GPa, followed by an annealing for 1 min/770 °C. According to our results, the BCPD improved the grain connectivity of the BCPDed wires without degrading the superconductivity. A (Ba,Sr) 1- x K x Fe 2 As 2 round-wire record transport critical current density, 1.14×10 5 A/cm 2 (4.2 K, 2 T), was observed in our BCPDed samples.

中文翻译：

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使用优化前驱体的双轴冷压致密化 (BCPD) 对 Ba 0.6 K 0.4 Fe 2 As 2 圆线材的影响

(Ba,Sr) 1- x K x Fe 2 As 2 超导体作为用于实际应用的导线引起了极大的兴趣。在本文中，Ba 0.6 K 0.4 Fe 2 As 2 前驱体粉末通过高能球磨辅助烧结（12 h/750 °C）制备。将制备的前体拉制成管内粉末圆线。部分拉制后的线材在 0.5 和 1.0 GPa 下进行双轴冷压致密化 (BCPD)，然后退火 1 分钟/770 °C。根据我们的结果，BCPD 在不降低超导性的情况下改善了 BCPD 线的晶粒连接性。在我们的 BCPD 样品中观察到 A (Ba,Sr) 1- x K x Fe 2 As 2 圆线记录传输临界电流密度，1.14×10 5 A/cm 2 (4.2 K, 2 T)。