Determining the structure of phosphorus in phase IV
Takahiro Ishikawa1, Hitose Nagara, Koichi Kusakabe
1Division of Frontier Materials Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan. ishikawa@aquarius.mp.es.osaka-u.ac.jp
Physical Review Letters
|April 12, 2006
Summary
Researchers uncovered the complex structure of phosphorus in phase IV (P-IV phase) using advanced simulations. This study reveals a new modulated monoclinic structure critical for understanding phosphorus under high pressure.
Area of Science:
- Solid-state physics
- Materials science
- Computational chemistry
Background:
- The high-pressure phases of phosphorus are not fully understood.
- Phase IV (P-IV) phosphorus exhibits complex structural behavior.
Purpose of the Study:
- To determine the unknown crystal structure of phosphorus in the P-IV phase.
- To elucidate the role of structural modulation in phase stability.
Main Methods:
- First-principles calculations were employed.
- Metadynamics simulations were utilized to explore structural possibilities.
- Structure refinement was performed by adjusting modulation periods.
Main Results:
- A novel modulated monoclinic structure for P-IV phosphorus was identified.
- Structural modulation was found to be essential for the stability of this phase.
- A refined structure closely matched experimental X-ray powder diffraction data.
Conclusions:
- The determined modulated monoclinic structure is proposed as the P-IV phase of phosphorus.
- The modulation period is likely incommensurate and close to the value found in this study.
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