Influence of microstructures and crystalline defects on the superconductivity of MgB2
作者： A. Serquis , S. S. Indrakanti , J. Y. Coulter , X. Z. Liao , J. D. Thompson
DOI: 10.1063/1.1479470
关键词: Superconductivity 、 Materials science 、 Crystallographic defect 、 High-temperature superconductivity 、 Magnetization 、 Microstructure 、 Grain boundary 、 Flux pinning 、 Scanning electron microscope 、 Condensed matter physics
摘要: This work studies the influence of microstructures and crystalline defects on superconductivity MgB2, with objective to improve its flux pinning. A MgB2 sample pellet that was hot isostatic pressed (HIPed) found have significantly increased critical current density (Jc) at higher fields than un-HIPed counterpart. The HIPed had a Jc 10 000 A/cm2 in 50 000 Oe (5 T) 5 K. 20 times sample, same as best reported by other research groups. Microstructures observed scanning transmission electron microscopy indicate HIP process eliminated porosity present resulting an improved intergrain connectivity. Such improvement connectivity believed prevent steep drop magnetic field H occurred H>45 000 Oe(4.5 T) T=5 K. also disperse MgO existed grain boundaries MgB2...
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