Analysis on Structural and Electrical Properties of High and Low Density Eu-Doped Bi(Pb)-2223 Superconductor

This research presented the preparation as well as characterization of high and low density Bi (Pb)-2223 cuprates superconductors doped with Eu 2 O 3 nanoparticles ( x = 0.00, 0.0025, 0.02 and 0.05) produced through a typical solid state reaction method. Low density sample was created by adding crystalline sucrose into mixed powders and burned at 400 °C for two hours. The crystalline structure was analyzed through X-ray diffraction (XRD) while electrical properties were studied using four-point probe measurement. Phase examination by XRD revealed that the crystallographic structure has shifted slightly from tetragonal to orthorhombic at higher Eu concentrations for both high and low density samples. The amount of 2223 phase steadily decreased as the Eu concentration increased, indicating that the substitution of Eu nanoparticles favours the formation of 2212 phases. Apparently, the T c value of the high density Eu-free sample was determined at 89 K. The addition of polycrystalline sucrose as a filler raises the T c up to 99 K in low density sample. However, increasing amount of Eu nanoparticles leads to the decrease in T c value. Meanwhile, the J c value is higher in low-density samples compared to high-density samples due to the presence of large surface area in a porous structure which enhances the grains connectivity. The best structural and electrical properties between the studied samples have been observed at sample with x = 0.0025 for both high and low density Eu-doped Bi (Pb)-2223.