Phase Diagram of Kob-Andersen-Type Binary Lennard-Jones Mixtures

This data repository contains data related to the paper Phase Diagram of Kob-Andersen-Type Binary Lennard-Jones Mixtures, Phys. Rev. Lett. 120, 165501 (2018), DOI: 10.1103/PhysRevLett.120.165501 by Ulf R. Pedersen, Thomas B. Schrøder, and Jeppe C. Dyre.

Abstract of the paper:

The binary Kob-Andersen (KA) Lennard-Jones mixture is the standard model for computational studies of viscous liquids

and the glass transition. For very long simulations, the viscous KA system crystallizes, however, by phase separating

into a pure A particle phase forming a fcc crystal. We present the thermodynamic phase diagram for KA-type mixtures

consisting of up to 50% small (B) particles showing, in particular, that the melting temperature of the standard KA

system at liquid density 1.2 is 1.028(3) in A particle Lennard-Jones units. At large B particle concentrations, the

system crystallizes into the CsCl crystal structure. The eutectic corresponding to the fcc and CsCl structures is cutoff

in a narrow interval of B particle concentrations around 26% at which the bipyramidal orthorhombic PuBr3 structure is

the thermodynamically stable phase. The melting temperature's variation with B particle concentration at two constant

pressures, as well as at the constant density 1.2, is estimated from simulations at pressure 10.19 using isomorph

theory. Our data demonstrate approximate identity between the melting temperature and the onset temperature below which

viscous dynamics appears. Finally, the nature of the solid-liquid interface is briefly discussed.