Strong Influence of Pressure on the Magnetic Properties of MgB2 Bulk Superconductors

Authors : Burcu SAVAŞKAN

Pages : 49-55

Doi:10.16984/saufenbilder.1194146

View : 24 | Download : 10

Publication Date : 2023-02-28

Article Type : Research Paper

Abstract :The influence of the pressure on the magnetic and superconducting properties of polycrystalline MgB2 bulks was studied. Bulk MgB2 samples were prepared using conventional in-situ solid state reaction and hot-pressing methods. The structural and electromagnetic properties of MgB2 samples were studied by using x-ray diffraction insert ignore into journalissuearticles values(XRD);, scanning electronic microscope insert ignore into journalissuearticles values(SEM);, magnetic hysteresis insert ignore into journalissuearticles values(M-H); and magnetic levitation force insert ignore into journalissuearticles values(Fz, Fx); measurements. XRD measurements proved high quality of MgB2 bulks with only small traces of MgO impurity phase. The zero-field Jc value reached 240 kA/cm2 for MgB2 sample produced by hot-press while 23 kA/cm2 for MgB2 sample produced by conventional in-situ at measurement temperature of 25 K. The max. levitation force values were obtained as 11.60 N and 15.42 N for MgB2 bulk samples produced by in-situ and hot-press methods at 25 K, respectively. All these magnetic measurements result indicate that pressure acts like driving force for manufacturing highly dense and high levitation capability MgB2 bulk superconductors.
Keywords : MgB2 superconductor, magnetic levitation force, in situ, hot press, critical current density