Magnetic Levitation and Some Mechanism of YBa2Cu3O7-δ Superconductor Doped with Nano-Sized Al2O3

In this study we report magnetic levitation, structural and mechanism analyses on YBa2Cu3O7-δ (noted Y-123) polycrystalline samples superconductor added with nano-sized Al2O3 particles. Magnetic levitation experiment was used to investigate the superconductivity state of the samples. X-ray diffraction (XRD) with the Rietveld refinement technique was carried out to characterize phase identification and lattice structural of samples. XRD results reveal that the lattice parameters change for Y-123 phases. The differentiate of resistivity dρ/dT has been calculated and the effect of addition of nano-sized Al2O3 particles in the critical superconducting temperature Tc has been reported. The calculated densities versus d-spacing for YBCO ceramic samples added with nano-sized alumina particles has been obtained. Superconducting parameters are affected by the nano-sized Al2O3 particles addition, and results are discussed in relevance to the structural and some mechanism of YBa2Cu3O7-δ bulk superconductor.

کلیدواژه ها:

High Temperature Superconductor ، Alumina-doped on Y-123 ، Magnetic Levitation ، Electrical properties