2008/02/29 by Zhaoshun Gao, Yanwei Ma, Xianping Zhang +6 · 10 citations
Materials Science · Physics and Astronomy · #Boron and Carbon Nanomaterials Research #Carbon fibers #Critical current #Dopant #Doping #Physics of Superconductivity and Magnetism #SPHERES #Superconductivity in MgB2 and Alloys #cond-mat.supr-con
paper · pdf · doi:10.1088/0953-2048/21/10/105020
published in Superconductor Science and Technology 21(10), 105020 (IOP Publishing) · 14 pages, 5 figures
openalex publication_date 2008/08/21 · arxiv created 2008/08/30 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A significant enhancement of critical current density ( J c ) and H irr in MgB 2 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 J c for the 850 °C sintered samples reached 3.1 × 10 4 and 1.4 × 10 4 A cm −2 at 10 and 12 T, respectively, and were better than those of optimal nano-SiC-doped tapes. The effects of different sintering temperature on lattice parameters, amount of carbon substitution, microstructure and J c of doped samples were also investigated. These results demonstrate that HCS is one of the most promising dopants besides nano-carbon and SiC for the enhancement of current capacity for MgB 2 in high fields.