![]() The 2D thermoelectric oxide, (Ca 3-xHo x)Co 4O 9-z (0 ≤x ≤ 0.5), has a misfit layered structure, and the 1D Ca 3Co 2O 6 consists of chains of alternating CoO 6 trigonal prisms and CoO 6 octahedra. The CaO-CoO z system consists of two calcium cobaltate thermoelectric compounds. ![]() No solid solution of the distorted perovskite, (Ho 1-xCax)CoO 3-z, was established at this temperature. Neither the reported Ho2CoO4 phase in the Ho 2O-CoO z system nor the Ca-doped (Ho 1+xCa1-x)CoO 4-z phase was present at 885 ☌. In the CaO-Ho 2O 3 system, while a small solid solution region was identified for (Ho 1-xCa x)O (3-z)/2 (0 ≤x ≤ 0.14), Ho was not present in the Ca site of CaO. Four three-phase regions and three solid solution tie-line regions were determined in the CaO-½Ho 2O 3-CoO z system. This diagram offers compatibility relationships in the ternary oxide system that are essential for processing and for the understanding of properties of several thermoelectric phases in the system. Ini this work, the phase equilibrium diagram of the CaO-½Ho 2O 3-CoO z system was determined at 885 ☌ in air.
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