Crystal growth of new strontium iron rhodium oxides: Sr4Fe0.73Rh2.27O9 and SrFe0.71Rh0.29O3

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Single crystals of two new strontium iron rhodates, SrFe0.71Rh0.29O3 and Sr4Fe0.73Rh2.27O9, have been grown and structurally characterized. Single crystals of SrFe0.71Rh0.29O3 and Sr4Fe0.73Rh2.27O9 were grown from potassium carbonate melts. SrFe0.71Rh0.29O3 crystallizes in the cubic perovskite structure, space group Pm3̄m" role="presentation" style="box-sizing: border-box; margin: 0px; padding: 0px; display: inline-block; line-height: normal; font-size: 16.2px; word-spacing: normal; overflow-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; position: relative;">Pm3̄m, with a=3.9027(6) Å. Sr4Fe0.73Rh2.27O9 crystallizes with trigonal symmetry in the space group P321, a=9.6091(2) Å and c=7.9448(2) Å, and is structurally related to the 2H-hexagonal perovskites. Sr4Fe0.73Rh2.27O9 contains two independent 1-D chains of face-sharing polyhedra with a sequence of two RhO6octahedra and one Fe/RhO6 trigonal prism and strontium cations separating the chains. The growth conditions, structures and magnetic properties of these compounds are discussed.