Subsolidus phase relations of the SrO–SbO_x–CuO system at 1140K in air

The subsolidus phase relations of the SrO–SbO_x–CuO system were investigated in air. The samples were equilibrated at 1140K. Under these conditions, 7 binary oxide phases are stable: Sr₂CuO₃, SrCuO₂, Sr₁₄Cu₂₄O_41−δ, CuSb₂O₆, SrSb₂O₆, Sr₂Sb₂O₇ and Sr₇Sb₂O₁₂. The ternary section contains 10 three-phase regions. A new ternary oxide phase with an approximate Sr₃Sb₂CuO₉ composition of was identified. It structure is related to that of Sr₈W₃CuO₁₈. This phase is not superconducting above 2K. Instead, the magnetic susceptibility indicates onset of weak ferro- or ferrimagnetism at T≈30K.