Superconducting properties of MgB2 prepared from attrition ball-milled boron powder

Enhanced critical current properties of in situ processed MgB2 wires using milled boron powder and low temperature solid-state reaction

“…Both the H c2 (T) and H irr (T) in the milled samples were higher than those of the un-milled samples due to the poor crystallinity and defects induced by the milling process as suggested by the decreased residual resistivity ratio (RRR) as presented in Table 1 [7,11,13]. This enhancement can also be explained by the increase of the grain boundary scattering due to a smaller grain size and the increase of the lattice disorder from the milling process as suggested by the increased normal-state resistivity [15,18]. In addition, a low temperature heat-treatment also contributes to an enhancement of the H c2 and H irr by slower grain growth.…”

“…They only presented the phase formation of the MgB 2 bulk, and did not present the J c or H c2 values. Therefore, a ball milling of only the B powder is another alternative and has been proven to be very effective for improving the superconducting properties of MgB 2 [13][14][15].…”

Synthesis and Characterization of Carbon-Doped MgB2 Superconductor Under Inert Carbon Environment

“…High affinity of Mg toward oxygen to form stable phase of MgO severely adds to the problem. Hence most of the synthesis techniques trusted till date for bulk synthesis of MgB 2 is the one which employs high pressure or vacuum and high temperature [6][7][8][9][10][11][12]. This imposes serious constrains on technical feasibility of the synthesis technique itself.…”

Synthesis of MgB2 superconductor under carbon induced virtual inert atmosphere

“…In this line, the authors have already worked out the low cost synthesis of MgB 2 thin film by electrodeposition [19,20], electrocrystallization [21][22][23] and electrophoretic techniques [24,25]. The present preparation techniques used for the synthesis of MgB 2 superconductors involves hot pressing [26,27] or hot isostatic pressing, ball milling [28], hot deformation [17], high pressure sintering, mechanical alloying [29], self-propagating high temperature synthesis [30], powder in sealed tube method [31], co-evaporation method [32], etc. These techniques are complicated and involved lengthy procedures and high cost equipments which in turn leads to comparatively high application cost.…”