空心碳球作为提高MgB2基带材临界电流密度的有效掺杂剂
Hollow carbon spheres as an efficient dopant for enhancing critical current density of MgB2 based tapes
摘要：
利用空心碳球（HCS）作为掺杂剂，通过原位粉末管法实现了MgB 2带材中Jc和Hirr的显著增强。在4.2 K下，850 C烧结样品的传输Jc在10 T和12 T下分别达到3.1 × 10^4和1.4 × 10^4 A/cm ^2，并且优于最佳纳米SiC掺杂的带材。此外，由于碳取代效应，掺杂样品在10 K下的Hirr提高到16.8 T。结果表明，HCS是除纳米碳和SiC外最有希望提高MgB 2高场电流容量的掺杂剂之一。
英文摘要：
A significant enhancement of Jc and Hirr in MgB2 tapes has been achieved by the in situ powder-in-tube method utilizing hollow carbon spheres (HCS) as dopants. At 4.2 K, the transport Jc for the 850C sintered samples reached 3.1x10^4, and 1.4x10^4 A/cm^2 at 10 and 12 T, respectively, and were better than those of optimal nano-SiC doped tapes. Furthermore, the Hirr for doped sample was raised up to 16.8 T at 10 K due to the carbon substitution effect. The results demonstrate that HCS is one of the most promising dopants besides nano-carbon and SiC for the enhancement of current capacity for MgB2 in high fields.
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