Crystal growth from a supersaturated melt: relaxation of the solid-liquid dynamic stiffness
arXiv:1405.5112 · doi:10.1063/1.4891671
Abstract
We discuss the growth process of a crystalline phase out of a metastable over-compressed liquid that is brought into contact with a crystalline substrate. The process is modeled by means of molecular dynamics. The particles interact via the Lennard-Jones potential and their motion is locally thermalized by Langevin dynamics. We characterize the relaxation process of the solid-liquid interface, showing that the growth speed is maximal for liquid densities above the solid coexistence density, and that the structural properties of the interface rapidly converge to equilibrium-like properties. In particular, we show that the off-equilibrium dynamic stiffness can be extracted using capillary wave theory arguments, even if the growth front moves fast compared to the typical diffusion time of the compressed liquid, and that the dynamic stiffness converges to the equilibrium stiffness in times much shorter than the diffusion time.
References in corpus (15)
- Accurate determination of crystal structures based on averaged local bond order parameters
- Phase-field-crystal models for condensed matter dynamics on atomic length and diffusive time scales: an overview
- Capillary Waves at Liquid/Vapor Interfaces: A Molecular Dynamics Simulation
- Non-equilibrium sedimentation of colloids on the particle scale
- Tension and stiffness of the hard sphere crystal-fluid interface
- Molecular Dynamics Computer Simulation of Crystal Growth and Melting in Al50Ni50
- The equilibrium intrinsic crystal-liquid interface of colloids
- Computer simulation studies of finite-size broadening of solid-liquid interfaces: From hard spheres to nickel
- Description of hard sphere crystals and crystal-fluid interfaces: a critical comparison between density functional approaches and a phase field crystal model
- Solid phase properties and crystallization in simple model systems
- Off-equilibrium surface tension in colloidal suspensions
- Capillary to bulk crossover of nonequilibrium fluctuations in the free diffusion of a near--critical binary liquid mixture
- Equilibrium and nonequilibrium fluctuations at the interface between two fluid phases
- Relaxation of surface tension in the free-surface boundary layer of simple Lennard-Jones liquids
- Laterally driven interfaces in the three-dimensional Ising lattice gas