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Microdomain model analysis on the negative partial intensity in a disordered ternary alloy.
1Department of Materials Science, Iwaki Meisei University, Fukushima, Japan. hashimot@iwakimu.ac.jp
Summary
Short-range order in ternary alloys causes negative diffuse scattering due to mixed atomic occupation on sublattices within microdomains. This occurs without macroscopic segregation, revealing complex local atomic arrangements in X-ray diffraction analysis.
Area of Science:
- Materials Science
- Solid-State Physics
- Crystallography
Background:
- Understanding local atomic arrangements is crucial for predicting material properties.
- Short-range order (SRO) describes non-random atomic distribution in alloys.
- Ternary alloy systems present complex ordering behaviors.
Purpose of the Study:
- To theoretically investigate local atomic arrangements in short-range-ordered ternary alloy systems.
- To apply a microdomain model, originally for binary alloys, to ternary systems.
- To explain the origin of negative partial intensity in diffuse scattering.
Main Methods:
- Theoretical analysis using X-ray diffraction.
- Application of a microdomain model for local atomic arrangements.
- Modeling of ternary alloy systems with short-range order.
Main Results:
- A microdomain model can describe local atomic arrangements in ternary alloys.
- Negative partial intensity of diffuse scattering is observed.
- This phenomenon is attributed to mixed occupation of atomic species on sublattice sites within microdomains.
Conclusions:
- The study provides a theoretical framework for understanding SRO in ternary alloys.
- Mixed atomic occupation on sublattice sites is a key factor in diffuse scattering.
- The findings are relevant for interpreting X-ray diffraction data of complex alloys.