The effect of graphene coated Si, Ti and Nb additions on the superconducting properties of MgB2 bulks
| Autor: | Pingxiang Zhang, Qing Wang, C. S. Li, Jing Feng, L. H. Jin, Lian Zhou, F. Yang, Huan Liu, Shuangcun Zhang, X. M. Xiong |
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| Rok vydání: | 2018 |
| Předmět: |
Superconductivity
Flux pinning Materials science Graphene Supercurrent Doping 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics Grain size Electronic Optical and Magnetic Materials law.invention Coating law 0103 physical sciences engineering Critical current Electrical and Electronic Engineering Composite material 010306 general physics 0210 nano-technology |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 29:7763-7769 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-018-8773-1 |
| Popis: | The effect of graphene (G) coated Si, Ti and Nb additions on the superconducting properties of MgB2 was systematically studied. The additives were prepared by a coating process and all introduced powders were scattered and combined with graphene. The coating process was useful for the uniform distribution of additives in MgB2 samples. The additives could effectively make the refinement of MgB2 grain size, which achieved an enhancement of surface pinning. Meanwhile, the densities of all the doped samples were larger than those of pure samples, which ensured a better intergrain connection for supercurrent. Therefore, the critical current density of MgB2 with 8 wt% G coated Nb addition got a significant enhancement due to the improvement of grain connectivity and flux pinning properties. |
| Databáze: | OpenAIRE |
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