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원문정보
초록
영어
Carbon-based doping to MgB2 superconductor is the simplest approach to enhance the critical current densities under magnetic fields. Carbon quantum dots is synthesized in this work as a carbon provider to MgB2 superconductors. Polyvinyl Pyrrolidone is pyrolyzed and dispersed in dimethylfomamide solvent as a dopant to the mixture of Mg and B powders. Doped MgB2 bulk samples clearly show the decrease of a-axis lattice constant, grain refinements, and broadening of FWHM of diffraction peaks compared to un-doped MgB2 possibly due to the carbon substitution and/or boron vacancy at the boron site in MgB2 lattice. Also, high-field Jc for the doped MgB2 is enhanced significantly with the crossover about 3 T at 5 & 20 K when increasing the doping of carbon quantum dots.
목차
Abstract 1. 서론 2. 실험 3. 결과 및 토론 4. 결론 ACKNOWLEDGMENT REFERENCES
키워드
MgB2superconductorcritical current densityflux pinningcarbon doping
저자
K. C. Chung [ Korea Institute of Materials Science, Changwon 51508, Korea ]
Corresponding author
S. H. Jang [ Kiswire Advanced Technology Ltd, Daejeon 34026, Korea ]
Y . S. Oh [ Korea Institute of Materials Science, Changwon 51508, Korea ]
S. H. Kang [ Korea Institute of Materials Science, Changwon 51508, Korea ]