TaNb(AgO3)2 crystallizes in the tetragonal P4/mmm space group. Ta(1) is bonded to two equivalent O(3) and four equivalent O(2) atoms to form TaO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with four equivalent Ta(1)O6 octahedra, and faces with eight equivalent Ag(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. Nb(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form NbO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with four equivalent Nb(1)O6 octahedra, and faces with eight equivalent Ag(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. Ag(1) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form AgO12 cuboctahedra that share corners with twelve equivalent Ag(1)O12 cuboctahedra, faces with six equivalent Ag(1)O12 cuboctahedra, faces with four equivalent Ta(1)O6 octahedra, and faces with four equivalent Nb(1)O6 octahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent Nb(1) and four equivalent Ag(1) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent Ta(1) and four equivalent Ag(1) atoms. In the third O site, O(3) is bonded in a linear geometry to one Ta(1), one Nb(1), and four equivalent Ag(1) atoms.
TaNb(AgO3)2 crystallizes in the tetragonal P4/mmm space group. Ta(1) is bonded to two equivalent O(3) and four equivalent O(2) atoms to form TaO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with four equivalent Ta(1)O6 octahedra, and faces with eight equivalent Ag(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. Both Ta(1)-O(3) bond lengths are 1.99 Å. All Ta(1)-O(2) bond lengths are 2.00 Å. Nb(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form NbO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with four equivalent Nb(1)O6 octahedra, and faces with eight equivalent Ag(1)O12 cuboctahedra. The corner-sharing octahedra are not tilted. Both Nb(1)-O(3) bond lengths are 2.02 Å. All Nb(1)-O(1) bond lengths are 2.00 Å. Ag(1) is bonded to four equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms to form AgO12 cuboctahedra that share corners with twelve equivalent Ag(1)O12 cuboctahedra, faces with six equivalent Ag(1)O12 cuboctahedra, faces with four equivalent Ta(1)O6 octahedra, and faces with four equivalent Nb(1)O6 octahedra. All Ag(1)-O(1) bond lengths are 2.84 Å. All Ag(1)-O(2) bond lengths are 2.84 Å. All Ag(1)-O(3) bond lengths are 2.83 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent Nb(1) and four equivalent Ag(1) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent Ta(1) and four equivalent Ag(1) atoms. In the third O site, O(3) is bonded in a linear geometry to one Ta(1), one Nb(1), and four equivalent Ag(1) atoms.