Iron <i>K</i> 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.