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Simulation of diffuse scattering in DL-norleucine
Thomas Richard Welberry1, Carl Henrik Görbitz2
1Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia.
Summary
Diffuse scattering in DL-norleucine (DL-Nle) crystals reveals insights into crystal disorder. Monte Carlo simulations link this scattering to molecular bilayer slipping during phase transitions, enhancing understanding of mixed phases.
Area of Science:
- Crystallography
- Materials Science
- Chemical Physics
Background:
- DL-norleucine (DL-Nle) crystals exhibit diffuse scattering, or 'streaking', between Bragg peaks.
- This phenomenon is typically attributed to stacking disorder in weakly interacting 2D layers, common in racemates and quasi-racemates.
Purpose of the Study:
- To investigate and extract information from diffuse scattering patterns in DL-Nle crystals.
- To model diffuse scattering and relate it to phase transition mechanisms.
Main Methods:
- Application of Monte Carlo simulations to analyze site distributions.
- Simulation of large crystal blocks (48x48x48 unit cells) with detailed site occupancy.
Main Results:
- Successfully modeled diffuse scattering patterns in DL-Nle.
- Established a link between diffuse scattering and molecular bilayer slipping during phase transitions.
- Demonstrated the possibility of quantifying domain size and defect density in intermediate mixed phases.
Conclusions:
- Diffuse scattering provides valuable information about crystal behavior and phase transitions.
- Monte Carlo simulations offer a powerful tool for analyzing complex crystallographic phenomena.
- This study advances the understanding of mixed phases in crystalline materials.
