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Phase Equilibria and Superconductivity in the System Y- Ba-Cu-O

The phase equilibria in the quaternary system Y-Ba-Cu-O have been studied with emphasis on the oxygen content and the T c temgerature of YBa 2 Cu 3 PO 7-x (123 phase), as well as the oxygen content of Y 2 BaCuO 5 (211 phase) and BaCuO 2 . In addition, the first influence of the two phases and CuO on the microstructure of the Y-Ba-Cu-O ceramics has been investigated. CuO wets the grain boundaries of the 123 crystals causing a weak electric link between the grains. The oxygen content of BaCuO 2 and Y 2 BaCuO 5 is a function of temperature