Superionic Conduction in the Plastic Crystal Polymorph of Na₄P₂S₆.

ABSTRACT: Sodium thiophosphates are promising materials for large-scale energy storage applications benefiting from high ionic conductivities and the geopolitical abundance of the elements. A representative of this class is Na₄P₂S₆, which currently shows two known polymorphs-α and β. This work describes a third polymorph of Na₄P₂S₆, γ, that forms above 580 °C, exhibits fast-ion conduction with low activation energy, and is mechanically soft. Based on high-temperature diffraction, pair distribution function analysis, thermal analysis, impedance spectroscopy, and ab initio molecular dynamics calculations, the γ-Na₄P₂S₆ phase is identified to be a plastic crystal characterized by dynamic orientatio

SUBMITTER: Scholz T 

PROVIDER: S-EPMC9008513 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature