What Is The Structure Of Silver(I,III) Oxide?

There is no such compound as silver(I,III) oxide.

Silver can exist in two oxidation states: +1 and +3. However, there is no evidence of a stable oxide containing both silver(I) and silver(III) ions. The most stable oxide of silver is silver(I) oxide (Ag2O), which has a simple cubic structure with silver ions arranged in a face-centered cubic lattice and oxygen ions occupying the octahedral voids.