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The LaO 1.5 -BaO-CuO pseudo-ternary phase diagram at 200 bar oxygen pressure was explored by a solid-state reaction at 980°C of numerous compositions. The phases which formed have been identified by X-ray diffraction. Significant differences from phases formed in air are noticed. BaCuO 2 and Ba 2 CuO 3 are absent, Ba 2 Cu 3 O 5+ ...