Superconductivity and Structural of ErBa2Cu3O7-δ Bulk Superconductor

Abstract

Bulk Er123 (ErBa₂Cu₃O_7-δ) superconducting ceramics were prepared via conventional solid state reaction. The samples were subjected to thermal treatment for 24 h calcined at 1223 K. The pelletized powder was sintered at 1223 K for 24 h. The samples showed a single step transition in the resistivity versus temperature curves. The T_conset of the samples was 93 K. The XRD data showed that the superconducting compound had an orthorhombic structure with the lattice constant as a = 3.82 Å, b = 3.88 Å, c = 11.68 Å and orthorhombicity parameter as 1.69% whereas the non-superconducting compound was a cubic structure with a = b = c = 18.25 Å. The simulation of atomic position in three dimensions. The SEM micrographs showed large grain sizes with a homogeneous surface. The EDX (mapping) showed a smooth distribution of Er, Ba, Cu and O bands without impurities. The heat reaction showed the endothermic curve with the peritectic temperature at 1277.980 K carried out by the DTA technique. Finally, The Cu²⁺ = 6.30 × 10^-6 and Cu³⁺ = 1.82 × 10^-6 Cu³⁺/ Cu²⁺ = 0.29 and oxygen deficiency have a δ value of 0.16 which were determined by a standard iodometric titration method.