Effect Of Vanadium Dope To Structural And Magnetic Properties Of MgB2 Superconductor System

In this study, structural and magnetic properties of compounds, which prepared bydoping Vanadium in form of (MgB2)2-xVx to MgB2, system were investigated..Samples were prepared with solid state reaction method in argon atmosphere.Structural characterization of samples was carried out by XRD and SEM measurements.Magnetic properties were determined by M-H and M-T measurements.XRD results showed that vanadium could not bind to MgB2 but remained in bulkstructure as vanadium or as inpurity phase in the form of VB or V1.54B50.SEM measurement of samples showed that granular structure of MgB2. The definitealign in the crystal structure was not observed but it was determined as granules which weretightly bonded and porosity was at low level. In M-H measurements diamagnetic signal pergrams which was decreased with the increasing ratio of vanadium dope. The highest Jc wasdetermined 8.4 105 A/cm5 in our samples.Critical temperature of samples were determined at 40K in the M-T measurements.Also positive magnetization means paramagnetic contribution was observed in M-Tmeasurements at x=0.4 and x=0.7 in the vanadium doped samples.Key Words: Superconductivity, MgB2 superconductor, critical current density,paramagnetism, diamagnetism.ii