Superionic materials are of interest for solid-state batteries or thermoelectrics, yet a clear understanding of the atomistic mechanisms is lacking. Here it is shown that transverse acoustic phonons persist above the superionic transition in argyrodite Ag8SnSe6, and that the free-Se sublattice controls fast Ag cation diffusion.
- Qingyong Ren
- Mayanak K. Gupta
- Jie Ma
