Optimization of sintering conditions in bulk MgB2 material for improvement of critical current density

Modelling of Critical Current Density of Sintered Ag Added Bulk MgB2

“…The scaling works efficiently for all samples irrespective of Ag with a peak located at h 0 ≈ 0.21 which suggests that dominant pinning centers were extended with normal-conducting defects. Similar values were obtained in earlier reports presented in the literature for small MgB 2 samples [20,26,27]. For instance, the peak position around h max = 0.2 suggests that grain-boundary pinning were active for both set of samples.…”

“…The superconducting transition was only 0.7 K wide, which indicates good quality of the samples. The reported superconducting transitions are similar or little bit higher than those of the recently reported bulk MgB 2 materials produced by the same, sintering technique [19,20]. The silver addition did not deteriorate the superconducting properties of the MgB 2 bulks, similar to the bulk melt-processed REBa 2 Cu 3 O y materials.…”

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

“…As a result, several researchers observed a dramatic improvement of the superconducting properties such as the irreversibility field, Hirr, the upper critical field, Hc2, or the critical current density, Jc, under high magnetic fields. Further, significant improvements in self-field performance were reached by optimizing the microstructure [10]. Our recent results also clarified that atomic force microscopy and EBSD observations clearly indicated that the observed grains exhibit grain sizes in the nanometer range and their density was high in the samples sintered for 3 h at 800 °C and 805 °C.…”

“…Our recent results also clarified that atomic force microscopy and EBSD observations clearly indicated that the observed grains exhibit grain sizes in the nanometer range and their density was high in the samples sintered for 3 h at 800 °C and 805 °C. Further, the samples sintered at 805 °C for 3 h showed a high critical current density of 245 kA/cm 2 at 20 K [10]. Moreover, the samples sintered at 775 °C for 1 h showed a high critical current density of 270 kA/cm 2 at 20 K [20].…”

“…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.…”