Structural and magnetic properties of Ruddlesden–Popper compounds in a double-perovskite family Srn(Fe,Ta)nO3n(SrO)

Sr3FeTaO7 and Sr4FeTaO8, the n=2n=2 and n=1n=1 member of Ruddlesden–Popper (RP) phases in a double perovskite family Srn+1(Fe,Ta)nO3n+1, have been synthesized by solid state reaction at 1350 °C in air. The crystallographic study shows that both compounds adapt typical tetragonal RP structures in the space group I4/mmm with the lattice parameters, a=3.9650(1)Å, c=20.5560(2)Å for Sr3FeTaO7 and a=3.9493(1)Å, c=12.6641(2)Å for Sr4FeTaO8. Similar to Sr2FeTaO6, Fe3+ and Ta5+ ions are randomly distributed in a single B-site in these structures. At low temperature, both Sr3FeTaO7 and Sr4FeTaO8 exhibit antiferromagnetic interactions, but no long-range magnetic ordering was observed.

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