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Updated: Apr 6, 2026
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Synthesis and Microdiffraction at Extreme Pressures and Temperatures
Published on: October 7, 2013
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High pressure Laue diffraction and its application to study microstructural changes during the α → β phase transition
D Popov1, C Park1, C Kenney-Benson1
1High Pressure Collaborative Access Team, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA.
The Review of Scientific Instruments
|August 3, 2015
Summary
Polychromatic x-ray Laue diffraction reveals pressure-induced microstructural changes in materials. This method offers advantages over monochromatic x-ray diffraction for studying phase transitions and subtle strains.
Area of Science:
- Materials Science
- Solid State Physics
- Crystallography
Background:
- Understanding material behavior under extreme conditions like high pressure is crucial.
- Traditional diffraction methods face limitations in characterizing complex microstructural changes.
Purpose of the Study:
- To introduce and validate a polychromatic x-ray Laue diffraction approach for analyzing pressure-induced microstructural evolution.
- To highlight the advantages of this technique over monochromatic x-ray diffraction.
Main Methods:
- Utilizing polychromatic x-ray Laue diffraction with a diamond anvil cell.
- Applying the technique to study the alpha to beta phase transition in Silicon (Si) at high pressures.
- Characterizing microstructural features including phase morphology, crystal orientation, and deviatoric strains.
Main Results:
- Successfully characterized microstructural changes during the Si alpha-beta phase transition.
- Observed and quantified the morphology of parent and product phases.
- Detected subtle inhomogeneous strains caused by lattice rotations, which are often missed by other methods.
Conclusions:
- Polychromatic x-ray Laue diffraction is a powerful tool for investigating pressure-induced microstructural transformations.
- The method provides detailed insights into crystal lattice behavior under non-ambient conditions.
- This technique enhances the study of phase transitions and strain analysis in materials science.
