Abstract
Series of (YBa2Cu3O7−δ )1−x (Al2O3) x samples have been prepared using solid state reaction method. Various amount of nano-sized Al2O3 particles (∼50 nm) were added with (x=0, 0.005, 0.01, 0.02, and 0.05). The microstructure and the morphology of the polycrystalline samples have been characterized by X-ray diffraction (XRD) and atomic force microscopy (AFM). The magneto-transport properties of these samples were investigated using resistance–temperature (R–T) and current–voltage (I–V) characteristics. All samples showed an orthorhombic structure with a tendency to transformation to tetragonal phase at higher levels of nanoparticles addition. The morphology of the surface of pure samples reveals a considerable number of weak-links, randomly oriented and clean grain boundaries. While in samples with nano inclusions, grain boundaries were filled with nanosized particle and have less number of weak-links. Significant enhancement of the superconducting critical current density J c in applied magnetic field was observed due to nano Al2O3 inclusions. However, further increase in the value of x decreases the transition temperature T c and the critical current density J c . These results were interpreted in terms of the flux pinning mechanisms in granular superconducting networks which leads to a better basic understanding of the performance of YBCO system in high applied magnetic fields.
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Albiss, B.A., Al-Rawashdeh, N., Abu Jabal, A. et al. Polycrystalline YBa2Cu3O7−δ with Nano-sized Al2O3 Inclusions. J Supercond Nov Magn 23, 1333–1340 (2010). https://doi.org/10.1007/s10948-010-0777-x
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DOI: https://doi.org/10.1007/s10948-010-0777-x