Improved Current Densities in MgB2 By Liquid-Assisted Sintering
arXiv:cond-mat/0504793 · doi:10.1063/1.1947374
Abstract
Polycrystalline MgB2 samples with GaN additions were prepared by reaction of Mg, B, and GaN powders. The presence of Ga leads to a low melting eutectic phase which allowed liquid phase sintering and produces plate-like grains. For low-level GaN additions (5% at. % or less), the critical transition temperature, Tc, remained unchanged and in 1T magnetic field, the critical current density, Jc was enhanced by a factor of 2 and 10, for temperatures of \~5K and 20K, respectively. The values obtained are approaching those of hot isostatically pressed samples.
12 pages, 1 table, 4 figures, accepted in Applied Physics Letters
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