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Structural and vibrational properties of phenanthrene under pressure
Qiao-Wei Huang1, Jiang Zhang, Adam Berlie
1Department of Physics, South China University of Technology, Guangzhou 510640, China.
High pressure transforms phenanthrene into an amorphous phase, revealing a coexistence of long-range order and local disorder. This study details structural and vibrational changes under extreme compression.
Area of Science:
- Materials Science
- Solid-State Physics
- Spectroscopy
Background:
- Phenanthrene, a polycyclic aromatic hydrocarbon, exhibits complex structural behavior under pressure.
- Understanding phase transitions is crucial for materials science and condensed matter physics.
Purpose of the Study:
- To investigate the structural and vibrational properties of phenanthrene at high pressures.
- To identify phase transitions and characterize the resulting material structures.
Main Methods:
- Raman spectroscopy was employed to analyze vibrational modes up to 30.2 GPa.
- Synchrotron X-ray diffraction was used to determine crystal structures under high pressure.
Main Results:
- Two phase transitions were observed at 2.3 GPa and 5.4 GPa, marked by changes in vibrational modes.
- Above 20.0 GPa, phenanthrene transforms into an amorphous phase, indicated by broad Raman peaks.
- X-ray diffraction identified distinct space groups (P2(1), P2/m, Pmmm) for different pressure phases, including a coexistence phase.
Conclusions:
- Phenanthrene undergoes significant structural and vibrational changes under high pressure, leading to an amorphous state.
- The amorphous phase retains some crystalline characteristics, suggesting a coexistence of long-range periodicity and local disorder.
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