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Stability and structure of a supercooled liquid mixture in two dimensions
1Aperiodic Solids Research Team, National Research Institute for Metals (NRIM), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan. dperera@tamamori.nrim.go.jp
Summary
This study investigates the amorphous state of 2D binary soft discs. A deep eutectic point stabilizes this state, showing minimal changes in structural order despite increased relaxation times.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Statistical Mechanics
Background:
- Understanding the amorphous state is crucial for materials science.
- Binary mixtures offer complex phase behaviors.
- Soft matter systems present unique thermodynamic challenges.
Purpose of the Study:
- To investigate the structural and thermodynamic properties of a 2D binary mixture of soft discs.
- To characterize the amorphous state and its stabilization mechanisms.
- To analyze the phase diagram and heat capacity behavior.
Main Methods:
- Constant NPT molecular dynamics simulations were employed.
- Thermodynamic integration was used to calculate the phase diagram.
- Voronoi analysis was performed on the low-temperature ground state.
Main Results:
- A deep eutectic point was identified, stabilizing the amorphous state.
- Increased structural relaxation times showed no significant increase in order.
- Voronoi analysis revealed a specific network of fivefold and sevenfold sites.
- An asymmetric heat capacity peak was observed at T*=0.55, indicating an 'enthalpy gap' around T*≈0.35.
Conclusions:
- The amorphous state in this 2D binary soft disc system is stabilized by a deep eutectic point.
- The system exhibits unusual behavior where relaxation time increases without significant order development.
- The observed enthalpy gap is linked to anharmonic fluctuations and minimum volume changes.