Abstract
Graphene is a special form of carbon which can effectively enhance the critical current density J c of MgB2. In this work, a systematic investigation on the impact of sintering conditions and doping level was carried out for graphene-doped MgB2 tapes. It is found that an appropriate addition level, i.e., 8 at% in this work, is very critical to obtain a high J c in graphene-doped samples. The critical field and pinning force are improved obviously due to the graphene doping. The magnetic J c of samples sintered at 800 °C with 8 at% graphene doping reached 1.78 × 104 A/cm2, at 5 T, 20 K. At the same time, the transport J c was up to 2.38 × 104 A/cm2 at 10 T, 4.2 K. The lattice distortion caused by C substitution and residual C at the grain boundaries were thought to be the major factors affecting the J c of graphene-doped MgB2 samples.
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This work is partially supported by the National Natural Science Foundation of China (Grant Nos. 51025726, 51202243, and 51104136) and the National ‘973’ Program (Grant No. 2011CBA00105).
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Tang, S., Wang, D., Zhang, X. et al. Improved Transport J c in MgB2 Tapes by Graphene Doping. J Supercond Nov Magn 27, 2699–2705 (2014). https://doi.org/10.1007/s10948-014-2804-9
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DOI: https://doi.org/10.1007/s10948-014-2804-9