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 Bi1.8Pb0.4Sr2Ca 2Cu3O10 + 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) mesurement, Vibrating sample mesurement (VSM), Resistance- temperature (ρ-T) mesurement and Vickers microhardness mesurement (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 of nano-Y addition. In SEM photographs, it is seen that granular structure is plate-like in all samples and increase in the amount of additive, presence of point particles on the layered particles is seen more clearly. Hole concentration values that calculated from ρ-T mesurement, ranges from 0.113 to 0.160. While amount of nano-Y increased, critical transition temperatures decreased. VSM results showed that critical current density values increase with the addition of Nano-Y. VHM results showed that the hardness value increased until x= 0.4% additive sample and decreased after this value.