A New Ionic Compound Sr 2Fe 8O 18: Crystal Structure and Analysis of Application on Solid Electrolytes
14 Pages Posted: 7 Oct 2019
The materials with high ionic conductivity are urgently needed for all-solid-state batteries. We reported a new ionic compound Sr2Fe8O18 which can be applicated on solid electrolyte. Sr2Fe8O18 is a typical p-type semiconductor and shows a layered monoclinic crystal structure. The ionic conductivity σ of the sample was calculated to be 0.2196×10-4 S/cm. The conductive mechanism which confirmed by the First principle calculation is mainly sublattice vacancy cation diffusion with self-diffusion coefficient D of 1.794×10-5cm2/s. Fe ion has two dimensional diffusion path and Sr ion has on dimensional diffusion path. Sr2Fe8O18 shows tremendous potential application on the solid electrolyte preparation.
Keywords: Ionic diffusion, Solid electrolytes, Ionic compounds, Oxygen-deficient perovskites
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