Controlled reactions have been undertaken between CO2 and polycrystalline YBa2Cu3O7-σ in the temperature range 500°-700°C. Typical reaction products are Y2BaCu05, BaC03 and CuO. Subsequent processing in O2 (e.g. sintering) results in the formation of liquid phases(s) by peritectic reaction at temperatures of 935-975°C, well below the incongruent melting point of YBa2Cu3O7-σ (∼1010°C). This “low temperature” liquid phase is shown to have a dramatic influence on the sintering process, and the resulting microstructures. The reactions are difficult to reverse even after extended times at temperatures >900°C. The results give an indication of the effect of adsorbed CO2 into YBa2Cu3O7-σ powders, albeit on a more localized scale.
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Kingon, A.I., Davis, C.D., Hare, T.M. et al. Control of Microstructures in the YBA2CU3O7-σ system: 1. Reaction with CO2 . MRS Online Proceedings Library 169, 253–256 (1989). https://doi.org/10.1557/PROC-169-253