Influence of Reduced Na Vacancy Concentrations in the Sodium Superionic Conductors Na_{11+ x}Sn₂P_{1- x}M_xS₁₂(M = Sn, Ge)

Exploration of sulfidic sodium solid electrolytes and their design contributes to advances in solid-state sodium batteries. Such a design is guided by a better understanding of fast sodium transport, for instance, in the herein studied Na11Sn2PS12-type materials. By using Rietveld refinements against synchrotron X-ray diffraction and...