Investigation of the Magnetic and Mechanical Properties of Nano-Y2O3 Doped Bismuth Based Superconductor Materials

Abstract

The effects of nano-Y2O3 addition on the structural, superconducting, magnetic and mechanical properties of Bi-2223 superconducting system were investigated in this study. Bulk polycrystalline samples with general formula of Bi1.8Pb0.4Sr2Ca2Cu3O10+δ + (Y2O3) with ( x; weighted % 0.0-0.2-0.4-0.8-1.0) were prepared by solid state reaction method. X-ray diffraction (XRD), Scanning Electron microscope (SEM), Energy dispersive X-ray spectroscopy (EDX) measurement, Vibrating sample measurement (VSM), Resistance- temperature (ρ-T) measurement and Vickers microhardness measurement (VHM) were also used for samples structural characterizations. XRD patterns showed that both Bi -2223 and Bi-2212 phases are coexist in the samples. While a lattice parameter increased, c lattice parameter decreased with increasing nano- Y2O3 addition. In SEM photographs, it is seen that granular structure is plate- like in all samples. The presence of point particles on the layered particles has been seen more clearly with increasing Y2O3 addition. Hole concentration values that calculated from ρ-T measurement, ranges from 0.113 to 0.160. While amount of Y2O3 addition increased, critical transition temperatures decreased. VSM results showed that critical current density values increase with Y2O3 addition. VHM results showed that the hardness value increased until x= 0.4% additive sample and decreased after this value.