Abstract This research presents the influence of pyrene (C16H10) addition (0, 2, 4, 6, 8, 10 wt%) on the superconducting properties of bulk MgB2. For C16H10 added MgB2 samples, a shrinkage in a-lattice parameters was determined, whereas c-lattice parameters remained practically unchanged. The (1 1 0) peak observed at 2θ ≈ 59.9◦ slightly shifted to higher angles, the lattice strain increased and the crystallite size reduced after C16H10 addition. By virtue of induced stronger pinning force, the in-field critical current density (Jc) increased after C16H10 addition. The Jc value at 20 K and 4 T was obtained about two times higher (8.54 × 103 A/cm2) for 4 wt% C16H10 added MgB2 sample than that of the pure one. In addition, the variation of levitation force characteristic of MgB2 with increasing C16H10 content was determined at 20, 25 and 30 K. The best vertical levitation force performance in zero-field-cooled regime was obtained as 7.09 N/g at 20 K for 4 wt% C16H10 added MgB2 sample with 13 mm in diameter.

中文翻译：

---

添加芘的 MgB2 体超导体的超导和悬浮力表征

摘要 本研究介绍了芘 (C16H10) 添加量 (0, 2, 4, 6, 8, 10 wt%) 对块体 MgB2 超导性能的影响。对于添加了 C16H10 的 MgB2 样品，确定了 a 晶格参数的收缩，而 c 晶格参数实际上保持不变。在 2θ≈59.9° 处观察到的 (1 1 0) 峰略微向更高的角度移动，添加 C16H10 后，晶格应变增加，晶粒尺寸减小。由于引入了更强的钉扎力，添加 C16H10 后场内临界电流密度 (Jc) 增加。在 20 K 和 4 T 条件下，添加 4 wt% C16H10 的 MgB2 样品的 Jc 值是纯样品的两倍（8.54 × 103 A/cm2）。此外，在 20、25 和 30 K 下测定了 MgB2 悬浮力特性随 C16H10 含量增加的变化。