Improved Performances of $\hbox {MgB}_{2}$ Conductor by Using of Innovative Amorphous and Nano-Structurated Boron

In this paper, we report about improved performances of amorphous and nano-structurated boron in MgB₂ critical current density of wires and tapes. The boron produced by magnesiothermic reaction, using nano-structurated boron oxide, is used to synthesize nano-structurated MgB₂ powders. These powders are used to produce several wires by ex-situ P.I.T. method. Here we applied only the ex-situ technique, in which our group is very well skilled. The same procedure can be applied to obtain in-situ P.I.T. tapes and wires as well. The boron and the MgB₂ powders are characterized both from a physical-chemical point of view and from the superconductive point of view. We performed X-ray analysis to compare the home-made boron crystalline degree with respect to the commercial one. SQUID and transport measurements were done to compare the wire´s critical current density behavior with respect to our past results using different boron.