Abstract
The phase equilibria of YBa2Cu3O7−d (123 phase) strongly influence its oxygen content and consequently its critical temperature Tc. With increasing content of BaCuO2 or CuO, Tc decreases. Whereas, if Y2BaCuO5 (211 phase) is in equilibrium with the 123 phase, the oxygen content and Tc of which is high. Bi2+x(Sr,Ca)3Cu2O8+d exhibits an extended single phase region and its Tc is strongly affected by its chemical composition. In addition, the oxygen content of the phase is a function of the temperature and influences the Tc of the phase.
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Majewski, P., Hettich, B., Rüffer, N. et al. The influence of the phase equilibria on the critical temperatures Tc of the high-Tc Bi−Sr−Ca−Cu−O and Y−Ba−Cu−O compounds. J. Electron. Mater. 22, 1259–1262 (1993). https://doi.org/10.1007/BF02818069
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DOI: https://doi.org/10.1007/BF02818069