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2016 ; 7
(ä): 13225
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The role of fivefold symmetry in suppressing crystallization
#MMPMID27779187
Taffs J
; Patrick Royall C
Nat Commun
2016[Oct]; 7
(ä): 13225
PMID27779187
show ga
Although long assumed to have an important role in the suppression of
crystallization and the development of glassformers, the effect of local fivefold
symmetry has never been directly tested. Here we consider whether such
suppression of crystallization has a kinetic or thermodynamic nature and
investigate its mechanism. We introduce a model in which the degree of fivefold
symmetry can be tuned by favouring arrangements of particles in pentagonal
bipyramids. We thus show that fivefold symmetry has both kinetic and
thermodynamic effects on the mechanism of crystallization to a face-centred cubic
crystal. Our results suggest that the mechanism of crystallization suppression is
related to the surface tension between fluid and crystal. Interestingly, the
degree of fivefold symmetry has little effect on crystal growth rate, suggesting
that growth may be only weakly coupled to fluid structure in hard sphere like
systems. Upon increasing the fivefold symmetry, we find a first-order transition
to an alternative icosahedra-rich phase. At intermediate bias strengths we find a
one-component glassformer.