Subsolidus phase relations of the SrO-SbOx-CuO system at 1140 K in air

Abstract The subsolidus phase relations of the SrO–SbO x –CuO system were investigated in air. The samples were equilibrated at 1140 K. Under these conditions, 7 binary oxide phases are stable: Sr 2 CuO 3 , SrCuO 2 , Sr 14 Cu 24 O 41− δ , CuSb 2 O 6 , SrSb 2 O 6 , Sr 2 Sb 2 O 7 and Sr 7 Sb 2 O 12 . The ternary section contains 10 three-phase regions. A new ternary oxide phase with an approximate Sr 3 Sb 2 CuO 9 composition of was identified. It structure is related to that of Sr 8 W 3 CuO 18 . This phase is not superconducting above 2 K. Instead, the magnetic susceptibility indicates onset of weak ferro- or ferrimagnetism at T  ≈ 30 K.