Ta3InO9 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(2)O7 pentagonal bipyramids, and edges with two equivalent Ta(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 39°. In the second Ta site, Ta(2) is bonded to one O(4), one O(5), one O(6), two equivalent O(1), and two equivalent O(3) atoms to form distorted TaO7 pentagonal bipyramids that share  a cornercorner with one Ta(1)O6 octahedra, corners with two equivalent Ta(2)O7 pentagonal bipyramids,  an edgeedge with one Ta(1)O6 octahedra, and edges with two equivalent Ta(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 37°. In(1) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(3), and two equivalent O(6) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Ta(1) and two equivalent Ta(2) atoms. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ta(1) and one In(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ta(2) and one In(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent Ta(2) atoms. In the fifth O site, O(5) is bonded in a distorted linear geometry to two equivalent Ta(2) atoms. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ta(1), one Ta(2), and one In(1) atom.
Ta3InO9 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(6) atoms to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra, corners with two equivalent Ta(2)O7 pentagonal bipyramids, and edges with two equivalent Ta(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 39°. Both Ta(1)-O(1) bond lengths are 2.01 Å. Both Ta(1)-O(2) bond lengths are 2.03 Å. Both Ta(1)-O(6) bond lengths are 1.98 Å. In the second Ta site, Ta(2) is bonded to one O(4), one O(5), one O(6), two equivalent O(1), and two equivalent O(3) atoms to form distorted TaO7 pentagonal bipyramids that share  a cornercorner with one Ta(1)O6 octahedra, corners with two equivalent Ta(2)O7 pentagonal bipyramids,  an edgeedge with one Ta(1)O6 octahedra, and edges with two equivalent Ta(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 37°. The Ta(2)-O(4) bond length is 1.97 Å. The Ta(2)-O(5) bond length is 1.94 Å. The Ta(2)-O(6) bond length is 2.28 Å. There is one shorter (2.08 Å) and one longer (2.13 Å) Ta(2)-O(1) bond length. There is one shorter (1.99 Å) and one longer (2.07 Å) Ta(2)-O(3) bond length. In(1) is bonded in a 5-coordinate geometry to one O(2), two equivalent O(3), and two equivalent O(6) atoms. The In(1)-O(2) bond length is 2.28 Å. Both In(1)-O(3) bond lengths are 2.25 Å. Both In(1)-O(6) bond lengths are 2.26 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Ta(1) and two equivalent Ta(2) atoms. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ta(1) and one In(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ta(2) and one In(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent Ta(2) atoms. In the fifth O site, O(5) is bonded in a distorted linear geometry to two equivalent Ta(2) atoms. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ta(1), one Ta(2), and one In(1) atom.