Optimization of processing conditions towards high trapped fields in MgB2 bulks

Development of MgB₂-Based Bulk Supermagnets

“…[11], the samples prepared at temperatures lower than 775 °C are not pure MgB 2 phase, and the respective j c is lower. The irreversibility fields, H irr , are determined from the M(H)-loops using a criterion of 100 Acm -2 .…”

“…The X-ray analysis of these samples is presented elsewhere [11]. The magnetic characterization measurements were performed using SQUID magnetometry (Quantum Design MPMS) and the magneto-resistance charac-teristics were recorded using an Oxford Instruments 8 T Teslatron system.…”

Production and Characterization of Bulk MgB2Material made by the Combination of Crystalline and Carbon Coated Amorphous Boron Powders

“…The intermetallic material is more attractive for the next generation of superconducting applications because of the lack of weak-links at the grain boundaries and a high critical transition temperature of 39 K as compared to the conventional NbTi. The superconducting transition temperature of MgB2 is significantly lower than that of YBa2Cu3Oy "Y-123", instead, MgB2 benefits of a high critical current density (Jc) in the polycrystalline state, which makes these materials promising candidates for several industrial applications including the next generation of super-magnets for medical devices, electrical power system, transportation and powerful super-magnets operating at around 20 K [3][4][5][6][7][8][9]. For superconducting super-magnet applications, it is required to produce good quality, low cost MgB2 material with high Jc and an acceptable mechanical performance.…”

“…For superconducting super-magnet applications, it is required to produce good quality, low cost MgB2 material with high Jc and an acceptable mechanical performance. To improve the critical current density of the MgB2 material, a variety of processing techniques have been developed and studied in terms of commercially usefulness [9,10]. On the other hand, to improve the critical current density of these materials a variety of dopants [11][12][13][14] were adopted and very successful results were observed, especially using carbon-based dopants, e.g., carbon, boron carbide, carbon nanotubes, carbohydrates or hydrocarbons, graphene oxide, carbon-coated boron powders, etc.…”

Modelling of Critical Current Density of Sintered Ag Added Bulk MgB2

“…As a result, MgB 2 receives a significant space for its applications in various technical and industrial areas. The examples are bulk magnets for magnetic resonance imaging (MRI), nuclear magnetic resonance (NMR), motors, energy storage systems, and non-contact bearings for liquid pumping purposes [6,7,[11][12][13]. These applications are possible even in a polycrystalline state, which significantly simplifies the preparation.…”