Ta3AgO8 is Brookite-derived structured and crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(1), one O(2), one O(5), one O(7), and two equivalent O(6) atoms to form TaO6 octahedra that share  a cornercorner with one Ag(1)O6 octahedra, corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, and edges with two equivalent Ag(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 29-56°. In the second Ta site, Ta(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom. In the third Ta site, Ta(3) is bonded to one O(3), one O(4), one O(5), one O(7), and two equivalent O(8) atoms to form distorted TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, and corners with three equivalent Ag(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 29-66°. Ag(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted AgO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra, corners with three equivalent Ta(3)O6 octahedra, and edges with two equivalent Ta(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 56-66°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ta(1), one Ta(2), and one Ag(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ta(1), one Ta(2), and one Ag(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Ta(2), one Ta(3), and one Ag(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Ta(2), one Ta(3), and one Ag(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Ta(1), one Ta(3), and one Ag(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to two equivalent Ta(1) and one Ag(1) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ta(1), one Ta(2), and one Ta(3) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Ta(2) and two equivalent Ta(3) atoms.
Ta3AgO8 is Brookite-derived structured and crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one O(1), one O(2), one O(5), one O(7), and two equivalent O(6) atoms to form TaO6 octahedra that share  a cornercorner with one Ag(1)O6 octahedra, corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, and edges with two equivalent Ag(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 29-56°. The Ta(1)-O(1) bond length is 2.09 Å. The Ta(1)-O(2) bond length is 2.00 Å. The Ta(1)-O(5) bond length is 2.06 Å. The Ta(1)-O(7) bond length is 1.98 Å. There is one shorter (1.92 Å) and one longer (2.01 Å) Ta(1)-O(6) bond length. In the second Ta site, Ta(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom. The Ta(2)-O(1) bond length is 1.88 Å. The Ta(2)-O(2) bond length is 1.93 Å. The Ta(2)-O(3) bond length is 1.92 Å. The Ta(2)-O(4) bond length is 2.03 Å. The Ta(2)-O(7) bond length is 2.12 Å. The Ta(2)-O(8) bond length is 2.35 Å. In the third Ta site, Ta(3) is bonded to one O(3), one O(4), one O(5), one O(7), and two equivalent O(8) atoms to form distorted TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(3)O6 octahedra, and corners with three equivalent Ag(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 29-66°. The Ta(3)-O(3) bond length is 2.01 Å. The Ta(3)-O(4) bond length is 1.91 Å. The Ta(3)-O(5) bond length is 1.87 Å. The Ta(3)-O(7) bond length is 2.38 Å. There is one shorter (1.98 Å) and one longer (2.09 Å) Ta(3)-O(8) bond length. Ag(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form distorted AgO6 octahedra that share  a cornercorner with one Ta(1)O6 octahedra, corners with three equivalent Ta(3)O6 octahedra, and edges with two equivalent Ta(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 56-66°. The Ag(1)-O(1) bond length is 2.49 Å. The Ag(1)-O(2) bond length is 2.58 Å. The Ag(1)-O(3) bond length is 2.36 Å. The Ag(1)-O(4) bond length is 2.35 Å. The Ag(1)-O(5) bond length is 2.49 Å. The Ag(1)-O(6) bond length is 2.61 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ta(1), one Ta(2), and one Ag(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ta(1), one Ta(2), and one Ag(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Ta(2), one Ta(3), and one Ag(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Ta(2), one Ta(3), and one Ag(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Ta(1), one Ta(3), and one Ag(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to two equivalent Ta(1) and one Ag(1) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Ta(1), one Ta(2), and one Ta(3) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Ta(2) and two equivalent Ta(3) atoms.