A study of precise oxygen concentration dependence of the superconducting volume fraction in Ba 2 YCu 3 O y (6.22≤ y ≤6.96) revealed the phase diagram of this superconducting system. Three characteristic phases are found based on the oxygen concentration: (1) a nonsuperconducting tetragonal phase for 6.2< y <6.4, (2) a low- T c ( T c = 55∼70 K) orthorhombic phase for 6.4≤ y <6.8 and (3) a high- T c ( T c =90 K) orthorhombic phase for 6.8≤ y <7.0. Evidence for a distinct critical concentration at y =6.7∼6.8, necessary to sustain the bulk high- T c (90 K) superconductivity, is presented.
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Tokumoto et al. (1987) studied this question.
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