In superionic compounds one component premelts, providing high ionic conductivity to solid-state electrolytes. Here we find sublattice melting in colloidal crystals of oppositely charged particles that are highly asymmetric in size and charge in salt solutions. The small particles in ionic compounds melt when the temperature increases, forming a superionic phase. These delocalized small particles in a crystal of large oppositely charged particles, in contrast to superionic phases in atomic systems, form crystals with nonelectroneutral stoichiometric ratios. This generates structures with multiple domains of ionic crystals in percolated superionic phases with adjustable stoichiometries.

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二元超离子胶体晶体中的亚晶格熔化

在超离子化合物中，一种组分会预熔融，从而为固态电解质提供高离子电导率。在这里，我们发现带相反电荷的粒子的胶体晶体中的亚晶格熔化，该粒子的大小和盐溶液中的电荷高度不对称。当温度升高时，离子化合物中的小颗粒熔化，形成超离子相。与原子系统中的超离子相相比，这些带有大的带相反电荷的粒子的晶体中的这些离域小粒子形成了具有非电中性化学计量比的晶体。这产生具有可调整的化学计量比的渗透超离子相中具有多个离子晶体域的结构。