EFFECTS OF CO2 ON THERMODYNAMIC STABILITY OF SUPERCONDUCTORS IN THE Y-BA-CU-O SYSTEMстатья
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Дата последнего поиска статьи во внешних источниках: 30 октября 2013 г.
Аннотация:Regions for thermodynamic stability of superconductors from the family of phases Y2Ba4Cu6+nO14+n (n=0, 1, 2) in CO2 + O2 gas mixtures have been established for a wide range of temperatures and partial pressures based on the thermodynamic study of the Y-Ba-Cu-O system. The results show that CO2 has a crucial effect on the stability of the superconductors, especially Y2Ba4Cu7O14+w. and YBa2Cu4O8. The reactions of the superconductorS with CO2, that limit their stability regions, always yield the Y2BaCuO5 phase. Nevertheless, Y2Cu2O5 often becomes a more stable product at higher CO2 partial pressures, some distance away from the stability range. Furthermore, metastable equilibria corresponding to decomposition into Y2Cu2O5 or Y2O3 are important under some conditions because of kinetic effects.