Abstract
Preparation and their properties of the precursors capable of forming variously shaped YBCO superconducting oxides were investigated. The precursors were prepared as viscous liquid or powder by the reaction of ethyl acetoacetate complexes of metals (M(etac)n:M=Y, Ba, Cu; n=2, 3) with triethanolamine (TEA) under reflux of ethanol, followed by concentration of the solvent and heating in vacuo. The precursors were soluble in alcohols, chloroform and THF. Since good spinnability was observed for the liquids or molten solutions, continuous fibers, therefore, were prepared by melt-spinning of the powders. YBa2Cu3O6.8 superconducting oxide of zero resistance temperature of 88.2K was obtained by heat treatment of the powders. A possible structure of precursor was estimated by the spectroscopic, elemental and GC analysis of the reaction products.
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