Subsolidus Phase Relationship in the CaO – CuO – TiO 2 Ternary System at 950°C in Air

The subsolidus phase relationship in the CaO – CuO – TiO 2 ternary system at 950°C in air was investigated. Total 26 samples having various nominal compositions were prepared by the solid‐state reaction at 950°C in air, and their equilibrium phases were analyzed by powder X‐ray diffraction (XRD). The CaCu 3 Ti 4 O 12 phase exhibits variable stoichiometry and forms as the Ca 1− x Cu 3+ x Ti 4 O 12 ‐type (−0.019 ≤ x ≤0.048) solid solution at 950°C in air. On the basis of our results and previous reports on the binary phase diagrams, the subsolidus phase diagram of the CaO – CuO – TiO 2 ternary system could be constructed at 950°C in air.