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Issue 17, 2020
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High antisite defect concentrations in hard-sphere colloidal Laves phases

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Abstract

Binary mixtures of hard spheres can spontaneously self-assemble into binary crystals. Computer simulations have been especially useful in mapping out the phase behaviour of these mixtures, under the assumption that the stoichiometry of the binary crystal is ideal. Here we show that for a size ratio of q = 0.82 this assumption is not valid near the coexistence region between the fluid and the stable binary crystal, the MgZn2 Laves phase. Instead we find a surprisingly high number of antisite defects: up to 2% of the large spheres are replaced by small spheres in equilibrium. We demonstrate that the defect concentration can be estimated using simple approximations, providing an easy way to identify systems where antisite defects play an important role. Our results shed new light on the self-assembly of colloidal Laves phases, and demonstrate the importance of antisite defects in binary crystals.

Graphical abstract: High antisite defect concentrations in hard-sphere colloidal Laves phases

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Article information


Submitted
25 Feb 2020
Accepted
01 Apr 2020
First published
02 Apr 2020

This article is Open Access

Soft Matter, 2020,16, 4155-4161
Article type
Paper

High antisite defect concentrations in hard-sphere colloidal Laves phases

B. van der Meer, F. Smallenburg, M. Dijkstra and L. Filion, Soft Matter, 2020, 16, 4155
DOI: 10.1039/D0SM00335B

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