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Structural evolution of Ga-Ge-Te glasses by combined EXAFS and XPS analysis
R Golovchak1, L Calvez, B Bureau
1Department of Physics and Astronomy, Austin Peay State University, Clarksville, Tennessee 37044, USA. ryh206@lehigh.edu
The Journal of Chemical Physics
|August 10, 2013
Summary
This study reveals the atomic structure of gallium-germanium-telluride glasses using X-ray photoelectron spectroscopy (XPS) and extended X-ray absorption fine structure (EXAFS). The research found specific atomic coordination, crucial for understanding glass properties.
Area of Science:
- Materials Science
- Solid State Chemistry
- Condensed Matter Physics
Background:
- Gallium-germanium-telluride (GaxGeyTe100-x-y) glasses are technologically relevant materials.
- Understanding their atomic structure is key to tailoring their physical properties.
Purpose of the Study:
- To elucidate the structural evolution of GaxGeyTe100-x-y glasses near the GeTe4-GaTe3 pseudo-binary tie-line.
- To correlate the determined atomic structure with the material's fundamental physical properties.
Main Methods:
- High-resolution X-ray photoelectron spectroscopy (XPS) was employed to probe the electronic structure.
- Extended X-ray absorption fine structure (EXAFS) spectroscopy provided element-specific local structural information.
- Complementary analysis of XPS and EXAFS data facilitated interpretation due to similar elemental electronegativities.
Main Results:
- A consistent 4/4/2 coordination (Ga/Ge/Te) was determined across the studied compositions.
- The absence of significant concentrations of Ga-Ge bonds and extended tellurium clusters was confirmed.
- The findings provide a detailed picture of the local atomic arrangement in these chalcogenide glasses.
Conclusions:
- The determined atomic structure, characterized by specific coordination numbers and bonding, is directly linked to the observed physical properties of Ga-containing germanium telluride glasses.
- This structural insight is vital for the rational design and application of these materials.
