Microstructures and superconducting properties of MgB2 bulk samples processed by ultra-high pressure-assisted sintering

Microstructures and superconducting properties of MgB2 bulk samples processed by ultra-high pressure-assisted sintering
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超高压辅助烧结MgB2块体样品的微观结构和超导性能

DOI:
10.1016/j.jeurceramsoc.2022.09.008
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发表时间:
2022
影响因子:
5.7
通讯作者:
Gao Z
Gao Z
中科院分区:
材料科学1区
文献类型:
--
作者:
Gao Z

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采用超高压辅助烧结(~ 5GPa)技术,在700 °C ~ 1100 °C的温度范围内制备了纳米晶MgB 2块体超导体。系统地研究了合金的相演变、形貌、晶粒尺寸和晶格缺陷。使用磁化方法测量超导性能,并与相应的微观结构特征相关联。在900 °C和5GPa下处理的样品在4.2K、6 T下的Jc值为4.5 × 107 A/m2,分别比在800和1100 °C下制备的样品高30倍和100倍以上。它的上级超导性能源于有限的晶粒生长、保留的晶体缺陷和通过施加超高压在快速过程中实现的完全致密化的组合。这项研究揭示了微观结构在控制烧结MgB 2超导行为中的重要性,特别是样品的均匀性,它会影响超导电流流过的长度尺度。
Nanocrystalline MgB2bulk superconductors have been fabricated by ultra-high pressure-assisted sintering (∼ 5 GPa) over a range of temperatures (700 °C-1100 °C). Phase evolution and morphology, grain size and lattice defects were systematically investigated. The superconducting performance was measured using magnetization methods and linked to the corresponding microstructural features. A sample processed at 900 °C and 5 GPa achieved a Jcvalue of 4.5 × 107A/m2at 4.2 K, 6 T, 30 times and more than 100 times higher than those prepared at 800 and 1100 °C respectively, under similar pressures. Its superior superconducting properties arise from the combination of limited grain growth, retained crystal defects and complete densification achieved in a rapid process by the application of ultra-high pressure. This study reveals the importance of microstructure in controlling the superconducting behavior in sintered MgB2, especially the sample homogeneity that can affect the length scales over which the supercurrents flow.
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