Iron K x-ray absorption-edge structures of FeS and FeS2

Abstract

The Fe K absorption‐edge structures of the NiAs‐type FeS and the pyrite‐type FeS₂ have been measured with a high‐resolution two‐crystal spectrometer. The K absorption edges consist of a step‐like structure and are interpreted in terms of the energy‐band structures for these sulfides. The presence of the absorption structure is much clearer in Fes₂ than in FeS. This difference is attributed to the difference of the iron 3d states in FeS and FeS₂ and the distortion of the octahedron [FeS₆]¹0− in these sulfides. The Fe K absorption spectrum of FeS₂ is compared with the sulfur K absorption spectrum reported previously and a good agreement is obtained between them.