TaNb(AgO3)2 is Orthorhombic Perovskite-derived structured and crystallizes in the orthorhombic P2_12_12 space group. Ta(1) is bonded to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(7) atom to form TaO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra and corners with five equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 16-24°. Nb(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(6), and one O(7) atom to form NbO6 octahedra that share  a cornercorner with one Nb(1)O6 octahedra and corners with five equivalent Ta(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 16-24°. There are three inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a distorted trigonal planar geometry to one O(4) and two equivalent O(2) atoms. In the second Ag site, Ag(2) is bonded in a distorted trigonal planar geometry to one O(3) and two equivalent O(1) atoms. In the third Ag site, Ag(3) is bonded in a 8-coordinate geometry to one O(1), one O(2), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. There are seven inequivalent O sites. In the first O site, O(6) is bonded in a 3-coordinate geometry to one Ta(1), one Nb(1), and two equivalent Ag(3) atoms. In the second O site, O(7) is bonded in a 3-coordinate geometry to one Ta(1), one Nb(1), and two equivalent Ag(3) atoms. In the third O site, O(1) is bonded in a 3-coordinate geometry to one Ta(1), one Nb(1), one Ag(2), and one Ag(3) atom. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to one Ta(1), one Nb(1), one Ag(1), and one Ag(3) atom. In the fifth O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Nb(1) and one Ag(2) atom. In the sixth O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Ta(1) and one Ag(1) atom. In the seventh O site, O(5) is bonded in a 4-coordinate geometry to one Ta(1), one Nb(1), and two equivalent Ag(3) atoms.
TaNb(AgO3)2 is Orthorhombic Perovskite-derived structured and crystallizes in the orthorhombic P2_12_12 space group. Ta(1) is bonded to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(7) atom to form TaO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra and corners with five equivalent Nb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 16-24°. The Ta(1)-O(1) bond length is 2.11 Å. The Ta(1)-O(2) bond length is 1.93 Å. The Ta(1)-O(4) bond length is 2.01 Å. The Ta(1)-O(5) bond length is 2.01 Å. The Ta(1)-O(6) bond length is 2.12 Å. The Ta(1)-O(7) bond length is 1.92 Å. Nb(1) is bonded to one O(1), one O(2), one O(3), one O(5), one O(6), and one O(7) atom to form NbO6 octahedra that share  a cornercorner with one Nb(1)O6 octahedra and corners with five equivalent Ta(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 16-24°. The Nb(1)-O(1) bond length is 1.95 Å. The Nb(1)-O(2) bond length is 2.13 Å. The Nb(1)-O(3) bond length is 2.02 Å. The Nb(1)-O(5) bond length is 2.02 Å. The Nb(1)-O(6) bond length is 1.94 Å. The Nb(1)-O(7) bond length is 2.14 Å. There are three inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a distorted trigonal planar geometry to one O(4) and two equivalent O(2) atoms. The Ag(1)-O(4) bond length is 2.50 Å. Both Ag(1)-O(2) bond lengths are 2.45 Å. In the second Ag site, Ag(2) is bonded in a distorted trigonal planar geometry to one O(3) and two equivalent O(1) atoms. The Ag(2)-O(3) bond length is 2.48 Å. Both Ag(2)-O(1) bond lengths are 2.46 Å. In the third Ag site, Ag(3) is bonded in a 8-coordinate geometry to one O(1), one O(2), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. The Ag(3)-O(1) bond length is 2.77 Å. The Ag(3)-O(2) bond length is 2.77 Å. There is one shorter (2.50 Å) and one longer (2.69 Å) Ag(3)-O(5) bond length. There is one shorter (2.51 Å) and one longer (2.79 Å) Ag(3)-O(6) bond length. There is one shorter (2.51 Å) and one longer (2.79 Å) Ag(3)-O(7) bond length. There are seven inequivalent O sites. In the first O site, O(6) is bonded in a 3-coordinate geometry to one Ta(1), one Nb(1), and two equivalent Ag(3) atoms. In the second O site, O(7) is bonded in a 3-coordinate geometry to one Ta(1), one Nb(1), and two equivalent Ag(3) atoms. In the third O site, O(1) is bonded in a 3-coordinate geometry to one Ta(1), one Nb(1), one Ag(2), and one Ag(3) atom. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to one Ta(1), one Nb(1), one Ag(1), and one Ag(3) atom. In the fifth O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Nb(1) and one Ag(2) atom. In the sixth O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Ta(1) and one Ag(1) atom. In the seventh O site, O(5) is bonded in a 4-coordinate geometry to one Ta(1), one Nb(1), and two equivalent Ag(3) atoms.