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The crystal structure of the layered iron arsenide Sr3Sc2O5Fe2As2 wasdetermined between 300 and 10 K. The lattice parameters of the tetragonal celldecrease anisotropically according to delta(c)/c : delta(a)/a = 4.2, whichresults in a slight flattening of the As-Fe-As bond angle within the FeAslayers. No indication of a structural instability could be detected. 57FeMoessbauer spectroscopic data show a single signal at 4.2, 77, and 298 K,respectively, subjected to quadrupole splitting. The isomer shift increasesfrom 0.36(1) mm/s at 298 K to 0.49(1) mm/s at 4.2 K. No indication for magneticordering was found.

Low Temperature Crystal Structure and 57Fe Moessbauer Spectroscopy of Sr3Sc2O5Fe2As2