Tetrahedral chain ordering and low dimensional magnetic lattice in a new brownmillerite SrScFeO.

We report the synthesis, structure and physical properties of a hitherto unreported brownmillerite compound Sr2ScFeO5. We have shown a new ordering sequence of the interlayer iron tetrahedral chains. Reduced dimensionality of the magnetic lattice and the frustration in the two dimensional iron tetrahedral chains originate complex magnetic and magneto-dielectric effects.

Combining Multiscale Approaches for the Structure Determination of an Iron Layered Oxysulfate: SrFeO(SO).

The new iron layered oxysulfate SrFeO(SO) has been prepared by a solid-state reaction in closed ampules into the form of ceramics and single crystals. Its atomic structure has been solved by means of spectroscopy, diffraction techniques, and high-resolution electron microscopy. SrFeO(SO) is a layered structure that derives from the Ruddelsden-Popper (RP) phases with the layer stacking sequence SrO/SrFeO/SrFe(SO)O/SrFeO.