Abstract
Local structure refinement of the SrFe 1− x Sn x O 3− y ( x=0.00, 0.25, 0.50 and 0.75) system has been carried out with Fe K-edge X-ray absorption spectroscopic studies. It is found out that the Fe ions are placed in two different symmetric sites, such as tetrahedral and octahedral sites in the compounds from Fe K-edge X-ray absorption near edge structures. Small absorption peaks of the electric quadrupole-allowed transitions appear at the pre-edge region of about 7112 eV, due to the existence of Fe ions in the tetrahedral and octahedral sites. Two different absorption peaks of 1s→4p dipole-allowed transition appear on the energy region between 7126 and 7131 eV. The peaks correspond to 1s→4p main transition of Fe ions in tetrahedral and octahedral sites and also to 1s→4p transition followed by the shakedown process of ligand to metal charge transfer. From extended X-ray absorption fine structure study, the interatomic distance of the Fe–O bond increases with the increasing amount of Sn atom. The interatomic distance of the Fe–Fe bond is smaller than that of the Fe–Sn bond, which shows that the substituted Sn atom is positioned to a longer distance of about 0.1 Å from the X-ray absorbing Fe atom.
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