Variation of MgB2 growth mode and enhancement of critical current density by instantaneously 800 °C-triggered low-temperature sintering. (November 2016)

• Record Type: Journal Article
• Authors: Cai, Qi; Liu, Yongchang; Guo, Qianying; Ma, Zongqing; Li, Huijun
• Is Part Of: Scripta materialia. Volume 124(2016)
• Page Start: 184
• Page End: 188
• Publication Date: 2016-11
• Subjects: MgB2 superconductors -- Low-temperature sintering -- Grain growth -- Critical current density; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.07.019
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Instantaneous high temperature improved the low-temperature sintering efficiency of the un-doped MgB2 superconductor, and the MgB2 was rapidly synthesized at 600 °C for only 2 h. In addition to the refinement of MgO impurity particles, the sudden high temperature induced defects within the MgB2 grains, e.g. twinning crystal, and the J c performance is therefore significantly enhanced, about 2.2 × 10 3 A·cm − 2 at 4 T for bulk sample. Differed from the two-dimensional nucleation growth mode of the MgB2 grains in the high-temperature sintered un-doped sample, the low-temperature sintered MgB2 grains accord with the dislocation growth mechanism, relying on the thermal-stress-triggered twinning crystal. Graphical abstract: