Ba2YAg3O8 crystallizes in the tetragonal P4/mmm space group. Ba(1) is bonded in a 8-coordinate geometry to four equivalent O(2) and four equivalent O(3) atoms. Y(1) is bonded in a body-centered cubic geometry to eight equivalent O(1) atoms. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to one O(3) and four equivalent O(1) atoms to form distorted AgO5 square pyramids that share  a cornercorner with one Ag(2)O6 octahedra and corners with four equivalent Ag(1)O5 square pyramids. The corner-sharing octahedra are not tilted. In the second Ag site, Ag(2) is bonded to two equivalent O(3) and four equivalent O(2) atoms to form AgO6 octahedra that share corners with four equivalent Ag(2)O6 octahedra and corners with two equivalent Ag(1)O5 square pyramids. The corner-sharing octahedra are not tilted. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to two equivalent Y(1) and two equivalent Ag(1) atoms. In the second O site, O(2) is bonded to four equivalent Ba(1) and two equivalent Ag(2) atoms to form a mixture of distorted corner, edge, and face-sharing OBa4Ag2 octahedra. The corner-sharing octahedral tilt angles range from 0-58°. In the third O site, O(3) is bonded to four equivalent Ba(1), one Ag(1), and one Ag(2) atom to form a mixture of corner, edge, and face-sharing OBa4Ag2 octahedra. The corner-sharing octahedral tilt angles range from 0-58°.
Ba2YAg3O8 crystallizes in the tetragonal P4/mmm space group. Ba(1) is bonded in a 8-coordinate geometry to four equivalent O(2) and four equivalent O(3) atoms. All Ba(1)-O(2) bond lengths are 2.85 Å. All Ba(1)-O(3) bond lengths are 2.91 Å. Y(1) is bonded in a body-centered cubic geometry to eight equivalent O(1) atoms. All Y(1)-O(1) bond lengths are 2.47 Å. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to one O(3) and four equivalent O(1) atoms to form distorted AgO5 square pyramids that share  a cornercorner with one Ag(2)O6 octahedra and corners with four equivalent Ag(1)O5 square pyramids. The corner-sharing octahedra are not tilted. The Ag(1)-O(3) bond length is 2.37 Å. All Ag(1)-O(1) bond lengths are 2.11 Å. In the second Ag site, Ag(2) is bonded to two equivalent O(3) and four equivalent O(2) atoms to form AgO6 octahedra that share corners with four equivalent Ag(2)O6 octahedra and corners with two equivalent Ag(1)O5 square pyramids. The corner-sharing octahedra are not tilted. Both Ag(2)-O(3) bond lengths are 2.09 Å. All Ag(2)-O(2) bond lengths are 2.06 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to two equivalent Y(1) and two equivalent Ag(1) atoms. In the second O site, O(2) is bonded to four equivalent Ba(1) and two equivalent Ag(2) atoms to form a mixture of distorted corner, edge, and face-sharing OBa4Ag2 octahedra. The corner-sharing octahedral tilt angles range from 0-58°. In the third O site, O(3) is bonded to four equivalent Ba(1), one Ag(1), and one Ag(2) atom to form a mixture of corner, edge, and face-sharing OBa4Ag2 octahedra. The corner-sharing octahedral tilt angles range from 0-58°.