Abstract
The partial replacement of copper with bismuth in YBa2Cu3Oy had led to a new phase instead of crystal site substitution. The resulting YBa2BiO6 could also be found whenever YBa2Cu3Oy reacted with Bi2O3. The YBa2BiO6 was formed either at the expense of YBa2Cu3Oy or by decomposing it, together with the liberation of copper oxide. Electrical measurements revealed the trend toward increased semiconducting normal state resistivity for bismuth-replaced samples. The insulating YBa2BiO6 phase was responsible for the deterioration of both superconductivity and mechanical strength.
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Yang, N., Liu, R.S., Wang, W.N. et al. Effects of bismuth replacement for copper on the microstructure and superconductivity of YBa2Cu3Oy . J Mater Sci 25, 4758–4761 (1990). https://doi.org/10.1007/BF01129937
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DOI: https://doi.org/10.1007/BF01129937