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The thermodynamic stability of the binary hard-sphere AB 2 superlattice structure has been confirmed by means of computer simulations. This is consistent with the results of experimental studies of suspensions of hard-sphere colloidal particles. A fit of the Helmholtz free energy surface for the region in phase space where AB 2 is found to be stable is presented, together with results for the c/a ratio of this hexagonal crystal.
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Eldridge et al. (1993) studied this question.
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