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The iron arsenide Eu3Fe2O5Fe2As2 was synthesized at 1173-1373 K in aresistance furnace and characterized by X-ray powder diffraction with Rietveldanalysis: Sr3Fe2O5Cu2S2-type, I4/mmm, a = 406.40(1) pm, c = 2646.9(1) pm.Layers of edge-sharing FeAs4/4 tetrahedra are separated by perovskite-likeoxide blocks. No structural transition occurs in the temperature range from 10to 300 K. Magnetic measurements have revealed Curie-Weiss behavior with aneffective magnetic moment of 7.79 muB per europium atom in agreement with thetheoretical value of 7.94 muB for Eu2+. A drop in the magnetic susceptibilityat 5 K indicates possible antiferromagnetic ordering. 151Eu and 57FeM\"ossbauer spectroscopic measurements have confirmed a beginning cooperativemagnetic phenomenon by showing significantly broadened spectra at 4.8 Kcompared to those at 78 K.

Synthesis, Crystal Structure and Magnetism of Eu3Sc2O5Fe2As2