Sb K-edge absorption fine structure of Sb₂Te₃

In order to study the local structure of some antimony compounds, Sb K-edge XAFS spectra were measured for Sb₂Te₃ and InSb. The measurements were performed in the transmission mode at BL-01 of SPring-8. Though crystal structure of antimony telluride Sb₂Te₃ is known by X-ray diffraction analysis, the EXAFS analyses give controversial result on the Sb-Te distance and the coordination number of Sb₂Te₃. Comparing the observed XANES spectra for Sb₂Te₃ with FEFF8 calculation, we can explain the controversial results which are also supported by the observed X-ray powder diffraction.