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Structural approach of CsCl-modified Ga2S3-La2S3 glasses
M C Alves1, A Y Ramos, N Watanabe
1LNLS, Campinas, Brazil.
Journal of Synchrotron Radiation
|August 22, 2001
Summary
Adding cesium chloride (CsCl) to gallium-lanthanum sulfide glasses enhances thermal stability without altering the fundamental gallium-sulfur polyhedral structure. This research clarifies the structural role of CsCl in these optoelectronic materials.
Area of Science:
- Materials Science
- Solid State Chemistry
- Optoelectronics
Background:
- Gallium-lanthanum sulfide glasses exhibit valuable semiconductor properties and long-wavelength transmission.
- Cesium chloride (CsCl) addition improves thermal stability, expanding potential optoelectronic applications.
Purpose of the Study:
- To investigate the structural role of CsCl in Ga2S3-La2S3 glasses.
- To understand how CsCl incorporation affects the local atomic environment and polyhedral structure.
Main Methods:
- X-ray absorption spectroscopy (XAS) was employed at the chlorine K edge and gallium K edge.
- Measurements were conducted at cryogenic temperatures (9 K) to enhance spectral resolution.
Main Results:
- The local environment around chlorine atoms closely resembles that in pure CsCl.
- Gallium coordination polyhedra are weakly distorted tetrahedra, consistent across all samples.
- Low-temperature measurements confirmed that CsCl addition does not alter the polyhedral corner linkage.
Conclusions:
- Cesium chloride acts as a network modifier without fundamentally changing the Ga-S tetrahedral network.
- The structural integrity of the gallium-sulfur polyhedra is maintained even with significant CsCl incorporation.
- These findings support the use of CsCl-modified glasses in advanced optoelectronic devices requiring thermal stability.