A novel process to produce amorphous nano-sized B useful for MgB2 phase synthesis

Abstract

In this paper we report a new synthesis route to produce boron powders characterized as being amorphous and having very fine particle size. This route has been developed to improve the performances of superconducting MgB2 powders, which can be directly synthesized from this nano-structured boron precursor by following the ex-situ or the in-situ P.I.T. method during the manufacturing of tapes, wires and cables. All the procedure steps are explained and the chemical-physical characterization of the boron powder, using x-ray diffraction (Xrd), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques, is reported. Furthermore, a comparison with commercial boron is given. Preliminary results of the magnetic and electrical characterization, such as the critical temperature (TC) and the transport critical current density (JC t), for the MgB2 tape are reported and compared with the tape prepared with commercial boron.

arXiv comment16 pages, 11 figures

References in corpus (4)

• Large transport critical currents in unsintered MgB2 superconducting tapes
• High-field superconductivity in alloyed MgB2 thin films
• Significantly enhanced critical current densities in MgB2 tapes made by a scaleable, nano-carbon addition route
• In-situ high energy synchrotron X-ray diffraction investigation of the MgB2 phase formation and MgB2 tapes sintering

Cited by in corpus (2)

• Grain size determination of superconducting MgB2 powders from magnetization curve, image analysis and surface area measurement
• High temperature heat treatment of B precursor and P.I.T. process optimization to increase Jc performances of MgB2-based conductor