Improved current densities in MgB2 by liquid-assisted sintering

Chen, S. K.; Lockman, Z.; Wei, M.; Glowacki, B. A.; MacManus-Driscoll, J. L.
June 2005
Applied Physics Letters;6/13/2005, Vol. 86 Issue 24, p242501
Academic Journal
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 platelike grains. For low-level GaN additions (<=5 at. %), the critical transition temperature, Tc, remained unchanged and in 1 T magnetic field, the critical current density, Jc was enhanced by a factor of 2 and 10, for temperatures of ∼5 K and 20 K, respectively. The values obtained are approaching those of hot isostatically pressed samples.


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