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Monte-Carlo simulations and small-angle x-ray scattering experiments wereused to determine the phase diagram of aqueous dispersions of titratablenano-colloids with a moderate size polydispersity over a broad range ofmonovalent salt concentrations, 0.5 mM $\leq c_s \leq$ 50 mM and volumefractions, $\phi$. Under slow and progressive increase in $\phi$, thedispersions freeze into a face-centered-cubic (fcc) solid followed unexpectedlyby the formation of a body centered cubic (bcc) phase before to melt in a glassforming liquid. The simulations are found to predict very well theseobservations. They suggest that the stabilization of the bcc solid at theexpense of the fcc phase at high $\phi$ and $c_s$ results from the interaction(charge) polydispersity and vibrational entropy.

Packing polydisperse colloids into crystals: when charge-dispersity matters