Abstract
The influence of annealing treatments on the crystal structure and superconducting properties of polycrystalline YBa2Cu3-xFexO7-δ has been estimated. The Fe elements was doped into Cu sites in polycrystalline YBa2Cu3-xFexO7-δ for 0.0 ≤ x ≤ 0.4. All of samples were annealed under different atmospheres: a low-oxygen-pressure atmosphere in flowing oxygen and a high-oxygen-pressure ambient. The local structure, magnetization, and electrical transport properties have been compared for the two series of samples before and after annealing. The lattice constants and Tc have been shown as a function of iron concentration for samples, indicating that the polycrystalline YBa2Cu3-xFexO7-δ materials display a structural transition from orthorhombic to tetragonal phase with increasing Fe concentration. Compared to as-synthesized samples, the annealed samples achieve a higher Tc. Furthermore, the YBa2Cu3-xFexO7-δ samples with x = 0.2, 0.3, 0.4 undergo from non-superconducting state to superconducting state after annealing.
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