Ta3AgO8 crystallizes in the orthorhombic Ibam space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(2), two equivalent O(3), and four equivalent O(1) atoms to form distorted TaO7 pentagonal bipyramids that share corners with two equivalent Ta(2)O8 hexagonal bipyramids, corners with two equivalent Ta(1)O7 pentagonal bipyramids, edges with two equivalent Ta(2)O8 hexagonal bipyramids, and edges with two equivalent Ta(1)O7 pentagonal bipyramids. In the second Ta site, Ta(2) is bonded to four equivalent O(1) and four equivalent O(2) atoms to form distorted TaO8 hexagonal bipyramids that share corners with four equivalent Ta(1)O7 pentagonal bipyramids, edges with two equivalent Ta(2)O8 hexagonal bipyramids, and edges with four equivalent Ta(1)O7 pentagonal bipyramids. Ag(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ta(2), two equivalent Ta(1), and one Ag(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Ta(1) and two equivalent Ta(2) atoms. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ta(1) and two equivalent Ag(1) atoms.
Ta3AgO8 crystallizes in the orthorhombic Ibam space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(2), two equivalent O(3), and four equivalent O(1) atoms to form distorted TaO7 pentagonal bipyramids that share corners with two equivalent Ta(2)O8 hexagonal bipyramids, corners with two equivalent Ta(1)O7 pentagonal bipyramids, edges with two equivalent Ta(2)O8 hexagonal bipyramids, and edges with two equivalent Ta(1)O7 pentagonal bipyramids. The Ta(1)-O(2) bond length is 1.98 Å. There is one shorter (1.96 Å) and one longer (2.05 Å) Ta(1)-O(3) bond length. There are two shorter (2.00 Å) and two longer (2.30 Å) Ta(1)-O(1) bond lengths. In the second Ta site, Ta(2) is bonded to four equivalent O(1) and four equivalent O(2) atoms to form distorted TaO8 hexagonal bipyramids that share corners with four equivalent Ta(1)O7 pentagonal bipyramids, edges with two equivalent Ta(2)O8 hexagonal bipyramids, and edges with four equivalent Ta(1)O7 pentagonal bipyramids. All Ta(2)-O(1) bond lengths are 2.11 Å. All Ta(2)-O(2) bond lengths are 2.08 Å. Ag(1) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(3) atoms. All Ag(1)-O(1) bond lengths are 2.77 Å. All Ag(1)-O(3) bond lengths are 2.57 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ta(2), two equivalent Ta(1), and one Ag(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Ta(1) and two equivalent Ta(2) atoms. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ta(1) and two equivalent Ag(1) atoms.