Preparation of YBa2Cu3O7−x by thermal decomposition of coprecipitated oxalates |
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Authors: | Ch Krüger H Langbein H Scheler |
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Affiliation: | (1) Dresden University of Technology, Institute of Inorganic Chemistry, 0-8027 Dresden, Germany |
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Abstract: | Yttrium, barium and copper oxalates are coprecipitated quantitatively from metal acetate solutions with oxalic acid in water-acetone mixtures. The particle-size distribution of the precipitate can be controlled by the precipitation conditions. Thermal decomposition of the coprecipitate leads to single-phase YBa2Cu3O7-x
. Despite the intermediate formation of BaCO3, the minimal reaction temperature (770 °C) is clearly lower than that for the solid-state reaction. Results of differential thermal analysis and isothermal thermogravimetry are discussed. The products are characterized by X-ray diffraction and infrared spectroscopy. |
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