Novel precursors in preparation and characterization of nanosuperconductor YBa[2]Cu[3]O[7-y]

Abstract

In order to prevent agglomeration of high temperature YBa2Cu3O7-x (YBCO) superconducting materials, the solid state processing method based on new and appropriate yttrium complex precursors that have high stability in air and compatibility in solution, was used without applying any surfactant. A new method of preparing yttrium precursors on the basis of coordination hydroxynaphthaldehydate, salicylaldehyde and acetylacetonate compounds has been suggested. These have been prepared by a reaction of yttrium acetate with three various coordination compounds for forming yttrium complex types. These techniques provide proper control on nanoparticles size distribution. The generated steric hindrance due to the structure of the novel precursors, acts like a protecting agent and prevents from agglomeration. We synthesized nanoparticles of a size about 30–50 nm with homogeneous grains distribution at high calcination temperature 920 °C. The maximum values of transition temperature into the superconducting state have been found to be Tc(0) = 84 K with a temperature interval of ∆T = 3 K for YBCO nanosuperconductor. The synthesized products were characterized by powder Xray diffraction, fourier transform infrared spectroscopy (FT-IR), transmission electron micrograph and scanning electronic microscopy. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/20664