TaIn3O7 crystallizes in the orthorhombic Pnma space group. Ta(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra and corners with eight equivalent In(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 31-71°. There are two inequivalent In sites. In the first In site, In(1) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(4) atoms. In the second In site, In(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form distorted InO6 octahedra that share corners with two equivalent In(2)O6 octahedra, corners with four equivalent Ta(1)O6 octahedra, and edges with two equivalent In(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-71°. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Ta(1), one In(1), and two equivalent In(2) atoms to form OTaIn3 tetrahedra that share corners with four equivalent O(4)In4 tetrahedra, edges with two equivalent O(4)In4 tetrahedra, and edges with two equivalent O(1)TaIn3 tetrahedra. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Ta(1) and two equivalent In(2) atoms. In the third O site, O(3) is bonded in a bent 150 degrees geometry to two equivalent Ta(1) atoms. In the fourth O site, O(4) is bonded to two equivalent In(1) and two equivalent In(2) atoms to form OIn4 tetrahedra that share corners with four equivalent O(1)TaIn3 tetrahedra, corners with six equivalent O(4)In4 tetrahedra,  an edgeedge with one O(4)In4 tetrahedra, and edges with two equivalent O(1)TaIn3 tetrahedra.
TaIn3O7 crystallizes in the orthorhombic Pnma space group. Ta(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form TaO6 octahedra that share corners with two equivalent Ta(1)O6 octahedra and corners with eight equivalent In(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 31-71°. Both Ta(1)-O(1) bond lengths are 2.10 Å. Both Ta(1)-O(2) bond lengths are 1.93 Å. Both Ta(1)-O(3) bond lengths are 1.90 Å. There are two inequivalent In sites. In the first In site, In(1) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(4) atoms. Both In(1)-O(1) bond lengths are 2.28 Å. There are two shorter (2.33 Å) and two longer (2.35 Å) In(1)-O(4) bond lengths. In the second In site, In(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form distorted InO6 octahedra that share corners with two equivalent In(2)O6 octahedra, corners with four equivalent Ta(1)O6 octahedra, and edges with two equivalent In(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-71°. There is one shorter (2.20 Å) and one longer (2.35 Å) In(2)-O(1) bond length. There is one shorter (2.18 Å) and one longer (2.32 Å) In(2)-O(2) bond length. There is one shorter (2.21 Å) and one longer (2.26 Å) In(2)-O(4) bond length. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Ta(1), one In(1), and two equivalent In(2) atoms to form OTaIn3 tetrahedra that share corners with four equivalent O(4)In4 tetrahedra, edges with two equivalent O(4)In4 tetrahedra, and edges with two equivalent O(1)TaIn3 tetrahedra. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Ta(1) and two equivalent In(2) atoms. In the third O site, O(3) is bonded in a bent 150 degrees geometry to two equivalent Ta(1) atoms. In the fourth O site, O(4) is bonded to two equivalent In(1) and two equivalent In(2) atoms to form OIn4 tetrahedra that share corners with four equivalent O(1)TaIn3 tetrahedra, corners with six equivalent O(4)In4 tetrahedra,  an edgeedge with one O(4)In4 tetrahedra, and edges with two equivalent O(1)TaIn3 tetrahedra.