Abstract
Phase equilibria in the system SrO-CaO-CuO have been studied under high oxygen pressures. The recently discovered non-superconducting binary phase, Sr 0.74(3)CuO 2, which is stable only under high oxygen pressure, forms a complete range of solid solutions with the structurally related phase, Ca 0.81(1)CuO 2. These materials have complicated superstructures and may form a family of Vernier phases, such as was found in Sr 0.74(3)CuO 2. Stabilities and oxygen stoichiometries of tetragonal Sr 2−2 x Ca 2 x CuO 3+δ (0.0 ≤ x ≤ 0.1) and Sr 14−14 x Ca 14 x Cu 24O 38+δ (0.0 ≤ x ≤ 0.5) solid solutions under high oxygen pressures are also discussed.
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