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Quantifying Concentration Fluctuations in Binary Glass-Forming Systems by Small- and Wide-Angle X-ray Scattering
Xiao Jin1, Yanhui Zhang1, Jun-Qiang Wang2
1State Key Laboratory of Metastable Materials Science and Technology and College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, People's Republic of China.
Understanding component miscibility in amorphous systems is crucial. Small- and wide-angle X-ray scattering (SWAXS) quantifies concentration fluctuations using the Porod invariant (Q), linking structure to mixing thermodynamics.
Area of Science:
- Materials Science
- Physical Chemistry
- Condensed Matter Physics
Background:
- Amorphous multicomponent systems' functionality relies on component miscibility.
- Understanding mixing behaviors is essential for amorphous drugs and electrolytes.
Purpose of the Study:
- To monitor mixing behaviors in glass-forming binary systems.
- To investigate the relationship between structural properties and mixing thermodynamics.
Main Methods:
- Applied small- and wide-angle X-ray scattering (SWAXS) technique.
- Studied three typical glass-forming binary systems with varied heat of mixing.
Main Results:
- Porod invariant (Q) at glass transition temperature enhances with intensified concentration fluctuation.
- Deviation of Q from ideal mixing law weakens at elevated temperatures.
- Concentration fluctuation degree is accurately quantified by structural property.
Conclusions:
- Structural properties, specifically the Porod invariant (Q), can quantify concentration fluctuations in mixing systems.
- This quantification provides a link between structural properties and mixing thermodynamics.
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