Amorphous B coated Mg nanopowder induces low angle grain boundaries and enhances J c of MgB2 wire

Superconductor Science and Technology Pub Date : 2024-06-09 DOI:10.1088/1361-6668/ad55cf

D. Xi, Xinwei Cai, Qingyang Wang, Chen Guo, Li Li, Meng Song, Yan Zhang, Dongliang Wang, Yanwei Ma, Guo Yan, Furen Wang, Zizhao Gan

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Abstract

In this work, amorphous B coated Mg nanopowder (BCMN) is synthesized and the transport properties of MgB2 superconducting wire is significantly enhanced with different contents of BCMN. BCMN has high reactivity since it contains nanoscale Mg and amorphous B. It allows to obtain MgB2 nanocrystals at only 400 °C with the compression of a lattice parameter and expansion of c lattice parameters compared to MgB2 formed by micron-sized Mg mixed with amorphous B (Mg+B) powders. These MgB2 nanocrystals serve as crystal nuclei and promote the crystallization and growth of MgB2. The mismatch of different lattice parameters prepared using BCMN and M+B powders induces low angle grain boundaries (LAGBs) embedded in MgB2 grains. LAGB acts as plane defects, leading to a dominant surface pinning mechanism and an enhancement in the critical current density dependent on the magnetic field (J c(H)). At 4.2 K in 6 T, transport critical current density (J ct) of wire with 20 wt.% BCMN is 6.7×104 A·cm−2, approximately 1.8 times wire with 0 wt.% BCMN.

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非晶 B 涂层纳米镁粉诱导低角度晶界并增强 MgB2 线材的 J c

这项研究合成了无定形 B 涂层纳米镁粉（BCMN），不同含量的 BCMN 显著提高了 MgB2 超导线材的传输性能。由于 BCMN 含有纳米级镁和无定形 B，因此具有很高的反应活性。与微米级镁和无定形 B（Mg+B）粉末混合形成的 MgB2 相比，BCMN 只需 400 ℃ 就能获得 MgB2 纳米晶体，同时压缩 a 晶格参数，扩大 c 晶格参数。这些 MgB2 纳米晶体可作为晶核，促进 MgB2 的结晶和生长。使用 BCMN 和 M+B 粉末制备的不同晶格参数的不匹配会诱发嵌入 MgB2 晶粒的低角度晶界（LAGB）。低角度晶界就像平面缺陷一样，导致了一种占主导地位的表面钉扎机制，并增强了与磁场相关的临界电流密度（J c(H)）。在 4.2 K 和 6 T 下，含有 20 wt.% BCMN 的金属丝的传输临界电流密度 (J ct) 为 6.7×104 A-cm-2，约为含有 0 wt.% BCMN 金属丝的 1.8 倍。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Superconductor Science and Technology

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