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We have reinvestigated the phase diagram of the Eu-Ba-Cu-O system at 950 o C in the pertinent regions of its isobaric-isothermal sections, both in air and in pure oxygen, i.e., at 0.2 and 1.0atm oxygen pressure. The results show that there is an equilibrium quadrilateral (with O 2 as the fifth phase) which is composed of the 123, 211, 011 and 143 phases (at a specified oxygen pressure)...
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