Superconductivity in Porous MgB2

Effects of heat treatment temperature on the formation of MgB2 bulk superconductors prepared using MgB4 and Mg powder

“…In addition to the high T c , the low current anisotropy and long coherence length are other merits of MgB 2 [2]. However, a low sintering density [3], poor mechanical strength, and flux creep [4] are problems to be solved for the practical applications of MgB 2 .…”

“…Recently, a new fabrication process, which can synthesize MgB 2 through a reaction between MgB 4 and Mg has been developed [16][17][18][19][20][21]. In this process, instead of Mg and B powders, MgB 4 and Mg powders are used as raw materials to increase the sintered density of MgB 2 .…”

“…In this process, instead of Mg and B powders, MgB 4 and Mg powders are used as raw materials to increase the sintered density of MgB 2 . A relatively smaller amount of Mg (one half of the in situ process) is used to form the same molar fraction of MgB 2 , in comparison with the convention in situ process using 2Mg and 4B powder [21].…”

“…In this study the effects of the heat treatment temperature on the formation of MgB 2 bulk superconductors prepared using MgB 4 and Mg powders was studied. The formation of MgB 2 and the microstructures developed at each reaction temperature were examined.…”

“…The self-synthesized MgB 4 and commercial Mg powders were used as raw materials for the formation of MgB 2 . The superconducting critical temperatures (T c s) of MgB 2 bulk superconductors prepared at 600℃-850℃ were as high as 37-38 K regardless of the heat treatment temperature.…”