Influence of the utilized precursors on the morphology and properties of YBa۲Cu۳O۷-y superconducting nanostructures

چکیده مقاله

In order to prevent agglomeration of high temperature ceramic material, the solid state processing based on new and appropriate yttrium complex precursors without applying surfactant has been suggested. These have been prepared by a reaction of yttrium acetate with three coordination compositions, acetylacetone, 2-hydroxo-1-naphthaldehyde and salicylaldehyde, for forming yttrium complex types. It was found that the size and morphology of products are clearly dependent on the type of utilized precursor because the organic ligands around yttrium center in these novel precursors act like a protecting agent. Magnetic susceptibility measurements showed that Tc of the superconducting nanoparticles is from 82 K to 88.4 K. The crystalline structures of the nanoparticles remained in orthorhombic symmetry. Characterizations of specimens were performed using scanning electron microscopy and transmission electron microscopy, supported by other techniques including XRD diffraction, energy dispersive X-ray, FT-IR spectrum and magnetic susceptibility measurements.