Abstract
We show how deeply quenching a liquid to temperatures where it is linearly unstable and the crystal is the equilibrium phase often produces crystalline structures with defects and disorder. As the solid phase advances into the liquid phase, the modulations in the density distribution created behind the advancing solidification front do not necessarily have a wavelength that is the same as the equilibrium crystal lattice spacing. This is because in a deep enough quench the front propagation is governed by linear processes, but the crystal lattice spacing is determined by nonlinear terms. The wavelength mismatch can result in significant disorder behind the front that may or may not persist in the latter stage dynamics. We support these observations by presenting results from dynamical density functional theory calculations for simple one- and two-component two-dimensional systems of soft core particles.
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- 1.
The result in Eq. (2) also applies to non-uniform liquids, i.e. to liquids initially at equilibrium with a density profile ρ old (r) in an external potential V old (r), disturbed by an infinitesimal change to the external potential, \(V _{old}(\mathbf{r}) \rightarrow V _{new}(\mathbf{r})\). The resulting change in the density profile \(\delta \rho (\mathbf{r}) \equiv \rho _{new}(\mathbf{r}) -\rho _{old}(\mathbf{r})\) is then also given by Eq. (2), where \(\delta V _{ext}(\mathbf{r}) \equiv V _{new}(\mathbf{r}) - V _{old}(\mathbf{r})\).
- 2.
- 3.
The specific criterion for deciding to which subset a given density peak belongs is as follows: After performing the Delauney triangulation on the set of peaks, we consider each triangle. The corner angles are \(\theta _{1}\), \(\theta _{2}\) and \(\theta _{3}\). The triangle is defined as equilateral if \(\vert \theta _{i} -\theta _{j}\vert <5^{\circ }\) for all pairs i, j = 1, 2, 3. The vertices of these triangles are coloured black. Triangles are defined as right-angled if for the largest angle \(\theta _{1}\) we have \(\vert \theta _{1} - 90^{\circ }\vert <5^{\circ }\) and for the other two angles \(\vert \theta _{2} -\theta _{3}\vert <5^{\circ }\). The vertices of these triangles are coloured red. All remaining vertices which fall into neither of these categories are displayed as open circles.
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Acknowledgements
A.J.A. and U.T. thank the Center of Nonlinear Science (CeNoS) of the University of Münster for recent support of their collaboration. M.C.W. is supported by an EPSRC studentship. The work of E.K. was supported in part by the National Science Foundation under Grant No. DMS-1211953.
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Archer, A.J., Walters, M.C., Thiele, U., Knobloch, E. (2016). Generation of Defects and Disorder from Deeply Quenching a Liquid to Form a Solid. In: Nishiura, Y., Kotani, M. (eds) Mathematical Challenges in a New Phase of Materials Science. Springer Proceedings in Mathematics & Statistics, vol 166. Springer, Tokyo. https://doi.org/10.1007/978-4-431-56104-0_1
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