Abstract
Bulk superconducting YBa2Cu3O7−x powder has been synthesized by a solution technique using a mixture of Ba-ethylenediaminetetra-acetic acid (EDTA) and [Y, Cu]-citric acid complexes. A light-blue, molecular-level, homogeneously mixed precursor was prepared, and transferred to powder form through vacuum drying. The vacuum-dried powder was decomposed at 800 °C for 4 h under flowing oxygen, then heat treated at high temperature from 850 to 950 °C for 6–12 h. The results ofT c measurements and X-ray analysis show that the orthorhombic, superconducting phase can be formed at temperatures above 850 °C following low-temperature annealing. A sharp transition (ΔT≃2 K) and high density can be achieved after 930 °C heat treatment. The 930 °C heat treated sample shows aJ c value of 510 A cm−2. It is concluded that this solution technique provides better stoichiometric control and lower reaction temperature than the conventional solid-state sintering process.
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Niou, C.S., Ma, Y.T., Li, W.P. et al. Preparation of superconducting YBa2Cu3O7−x powders by a solution technique. J Mater Sci: Mater Electron 3, 181–186 (1992). https://doi.org/10.1007/BF00695518
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DOI: https://doi.org/10.1007/BF00695518