Subsolidus Phase Relations of the CoOx-CuO-SrO System  

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The subsolidus phase relations of the CoOx-CuO-SrO system were investigated in air. The samples were equilibrated at 900 °C. The pseudo-ternary section contains three stoichiometric binary oxide phases (Sr2CuO3, SrCuO2 and Sr14Cu24O41−δ) and a binary oxide solid solution: Sr6+xCo5O15+δ (0 ≤ x ≤ 0.36). Two binary phases extend into the ternary system forming solid solutions, i.e., Sr14Cu24−xCoxO41−δ (0 ≤ x ≤ 5) and Sr6+xCo5−yCuyO15+δ (0 ≤ x ≤ 0.36, 0 ≤ y ≤ 1.0). The Sr6+xCo5O15+δ solid solution was found to undergo a phase separation into a mixture of Sr6Co5O15−δ and Sr14Co11O33 upon annealing at 600 °C. This transformation is reversible.
Original languageEnglish
JournalJournal of Phase Equilibria and Diffusion
Issue number5
Pages (from-to)646-655
Publication statusPublished - 2017


  • Experimental phase equilibria
  • Isothermal section
  • Oxide systems
  • Pseudoternary

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