The role of local bond-order at crystallization in a simple supercooled liquid

Søren Toxvaerd ()
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Søren Toxvaerd: DNRF Centre “Glass and Time”, IMFUFA, Department of Sciences, Roskilde University

The European Physical Journal B: Condensed Matter and Complex Systems, 2020, vol. 93, issue 11, 1-8

Abstract: Abstract Large scale Molecular Dynamics simulations of 65 systems with N = 80 000 Lennard–Jones particles at two different supercooled liquid state points reveal, that the supercooled states contain spatially heterogeneous distributed subdomains of particles with significant higher bond-order than the mean bond-order in the supercooled liquid. The onset of the crystallization starts in such an area with relatively high six-fold bond-order for a supercooled state, but low bond-order for a fcc crystal state, and the crystallization is initiated by a nucleus where all particles in the critical nucleus have a significant lower bond-order than in a fcc crystal. The critical nucleus of N ≈ 70 particles is surrounded by many hundreds of particles with relatively high supercooled liquid bond-order and many of these particles are aligned with the crystal ordered particles in the critical nucleus. The crystallizations are very fast and supported by a fast growth of the supercooled areas with relative high liquid bond-order. The crystallizations are to fcc crystals, but a significant part of the crystallizations exhibit five-fold arrangements of polycrystalline subdomains mainly with fcc crystal order and sign of hcp crystallites. Graphical abstract

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1140/epjb/e2020-10367-y

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