Thermal evolution from a precursor to the Y-Ba-Cu-O superconductor: X-ray absorption spectroscopy study and application to thick-film technology

The local structure around copper and yttrium atoms in a Y-Ba-Cu-O precursor prepared by spray pyrolysis is investigated by means of x-ray absorption spectroscopy. Near-edge and extended x-ray absorption fine structure analysis, together with powder diffraction measurements, give detailed information about structure and morphology of the precursor, as well as a clear picture of its thermal evolution towards the superconducting phase. Thick films prepared starting from this precursor are characterized. Their excellent electrical properties exemplify possible applications of this material.