Sb K-edge absorption fine structure of Sb2Te3

Area of Science:

• Materials Science
• Solid State Physics
• X-ray Spectroscopy

Background:

• Understanding the local atomic structure of antimony compounds is crucial for their applications.
• Previous X-ray diffraction studies on antimony telluride (Sb2Te3) yielded controversial results regarding Sb-Te bond distances and coordination numbers.
• X-ray absorption spectroscopy (XAS) offers a powerful method to probe local atomic environments.

Purpose of the Study:

• To investigate the local structure of antimony compounds, specifically Sb2Te3 and InSb.
• To resolve discrepancies in reported Sb-Te bond distances and coordination numbers for Sb2Te3.
• To validate X-ray absorption near edge structure (XANES) analysis using theoretical calculations and experimental data.

Main Methods:

• Measurement of Sb K-edge X-ray absorption fine structure (XAFS) spectra for Sb2Te3 and InSb.
• Data acquisition performed in transmission mode at the SPring-8 synchrotron facility (BL-01).
• Analysis of XANES spectra and comparison with FEFF8 theoretical calculations, complemented by X-ray powder diffraction (XRD).

Main Results:

• XAFS spectra provided detailed local structural information for Sb2Te3 and InSb.
• Comparison of experimental XANES spectra with FEFF8 calculations successfully explained the controversial results for Sb2Te3.
• The findings were consistent with the observed X-ray powder diffraction data, confirming the structural analysis.

Conclusions:

• X-ray absorption spectroscopy, particularly XANES analysis combined with theoretical calculations, is effective in resolving ambiguities in local structure determination.
• This study successfully clarified the Sb-Te bond distance and coordination number in Sb2Te3.
• The results highlight the importance of complementary techniques for accurate materials characterization.