Ba8In6O17 crystallizes in the monoclinic C2/m space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(6), one O(7), one O(8), and two equivalent O(4) atoms. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to one O(3), one O(5), one O(7), and three equivalent O(2) atoms. There are two inequivalent In sites. In the first In site, In(1) is bonded to one O(2), one O(3), one O(4), one O(5), and one O(7) atom to form corner-sharing InO5 square pyramids. In the second In site, In(2) is bonded to one O(1), one O(6), one O(8), and two equivalent O(4) atoms to form corner-sharing InO5 trigonal bipyramids. There are eight inequivalent O sites. In the first O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Ba(2) and two equivalent In(1) atoms. In the second O site, O(6) is bonded to four equivalent Ba(1) and two equivalent In(2) atoms to form a mixture of distorted corner and face-sharing OBa4In2 octahedra. The corner-sharing octahedral tilt angles range from 63-66°. In the third O site, O(7) is bonded to two equivalent Ba(1), two equivalent Ba(2), and two equivalent In(1) atoms to form distorted OBa4In2 octahedra that share corners with two equivalent O(1)Ba4In2 octahedra, corners with two equivalent O(3)Ba4In2 octahedra, corners with two equivalent O(6)Ba4In2 octahedra, corners with four equivalent O(2)Ba3In tetrahedra,  an edgeedge with one O(8)Ba4In2 octahedra, edges with two equivalent O(3)Ba4In2 octahedra, and edges with two equivalent O(2)Ba3In tetrahedra. The corner-sharing octahedral tilt angles range from 3-66°. In the fourth O site, O(8) is bonded to four equivalent Ba(1) and two equivalent In(2) atoms to form a mixture of corner, face, and edge-sharing OBa4In2 octahedra. The corner-sharing octahedral tilt angles range from 3-7°. In the fifth O site, O(1) is bonded to four equivalent Ba(1) and two equivalent In(2) atoms to form a mixture of corner, face, and edge-sharing OBa4In2 octahedra. The corner-sharing octahedral tilt angles range from 3-7°. In the sixth O site, O(2) is bonded to three equivalent Ba(2) and one In(1) atom to form distorted OBa3In tetrahedra that share corners with two equivalent O(3)Ba4In2 octahedra, corners with two equivalent O(7)Ba4In2 octahedra, corners with two equivalent O(2)Ba3In tetrahedra,  an edgeedge with one O(3)Ba4In2 octahedra,  an edgeedge with one O(7)Ba4In2 octahedra, and edges with two equivalent O(2)Ba3In tetrahedra. The corner-sharing octahedral tilt angles range from 35-62°. In the seventh O site, O(3) is bonded to two equivalent Ba(1), two equivalent Ba(2), and two equivalent In(1) atoms to form distorted OBa4In2 octahedra that share corners with two equivalent O(6)Ba4In2 octahedra, corners with two equivalent O(7)Ba4In2 octahedra, corners with two equivalent O(8)Ba4In2 octahedra, corners with four equivalent O(2)Ba3In tetrahedra,  an edgeedge with one O(1)Ba4In2 octahedra, edges with two equivalent O(7)Ba4In2 octahedra, and edges with two equivalent O(2)Ba3In tetrahedra. The corner-sharing octahedral tilt angles range from 3-63°. In the eighth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Ba(1), one In(1), and one In(2) atom.
Ba8In6O17 crystallizes in the monoclinic C2/m space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(6), one O(7), one O(8), and two equivalent O(4) atoms. The Ba(1)-O(1) bond length is 2.99 Å. The Ba(1)-O(3) bond length is 3.05 Å. The Ba(1)-O(6) bond length is 3.05 Å. The Ba(1)-O(7) bond length is 2.91 Å. The Ba(1)-O(8) bond length is 3.00 Å. There is one shorter (2.69 Å) and one longer (2.75 Å) Ba(1)-O(4) bond length. In the second Ba site, Ba(2) is bonded in a 6-coordinate geometry to one O(3), one O(5), one O(7), and three equivalent O(2) atoms. The Ba(2)-O(3) bond length is 2.92 Å. The Ba(2)-O(5) bond length is 2.68 Å. The Ba(2)-O(7) bond length is 3.13 Å. There are a spread of Ba(2)-O(2) bond distances ranging from 2.63-2.71 Å. There are two inequivalent In sites. In the first In site, In(1) is bonded to one O(2), one O(3), one O(4), one O(5), and one O(7) atom to form corner-sharing InO5 square pyramids. The In(1)-O(2) bond length is 2.12 Å. The In(1)-O(3) bond length is 2.23 Å. The In(1)-O(4) bond length is 2.18 Å. The In(1)-O(5) bond length is 2.07 Å. The In(1)-O(7) bond length is 2.21 Å. In the second In site, In(2) is bonded to one O(1), one O(6), one O(8), and two equivalent O(4) atoms to form corner-sharing InO5 trigonal bipyramids. The In(2)-O(1) bond length is 2.20 Å. The In(2)-O(6) bond length is 2.07 Å. The In(2)-O(8) bond length is 2.21 Å. Both In(2)-O(4) bond lengths are 2.13 Å. There are eight inequivalent O sites. In the first O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Ba(2) and two equivalent In(1) atoms. In the second O site, O(6) is bonded to four equivalent Ba(1) and two equivalent In(2) atoms to form a mixture of distorted corner and face-sharing OBa4In2 octahedra. The corner-sharing octahedral tilt angles range from 63-66°. In the third O site, O(7) is bonded to two equivalent Ba(1), two equivalent Ba(2), and two equivalent In(1) atoms to form distorted OBa4In2 octahedra that share corners with two equivalent O(1)Ba4In2 octahedra, corners with two equivalent O(3)Ba4In2 octahedra, corners with two equivalent O(6)Ba4In2 octahedra, corners with four equivalent O(2)Ba3In tetrahedra,  an edgeedge with one O(8)Ba4In2 octahedra, edges with two equivalent O(3)Ba4In2 octahedra, and edges with two equivalent O(2)Ba3In tetrahedra. The corner-sharing octahedral tilt angles range from 3-66°. In the fourth O site, O(8) is bonded to four equivalent Ba(1) and two equivalent In(2) atoms to form a mixture of corner, face, and edge-sharing OBa4In2 octahedra. The corner-sharing octahedral tilt angles range from 3-7°. In the fifth O site, O(1) is bonded to four equivalent Ba(1) and two equivalent In(2) atoms to form a mixture of corner, face, and edge-sharing OBa4In2 octahedra. The corner-sharing octahedral tilt angles range from 3-7°. In the sixth O site, O(2) is bonded to three equivalent Ba(2) and one In(1) atom to form distorted OBa3In tetrahedra that share corners with two equivalent O(3)Ba4In2 octahedra, corners with two equivalent O(7)Ba4In2 octahedra, corners with two equivalent O(2)Ba3In tetrahedra,  an edgeedge with one O(3)Ba4In2 octahedra,  an edgeedge with one O(7)Ba4In2 octahedra, and edges with two equivalent O(2)Ba3In tetrahedra. The corner-sharing octahedral tilt angles range from 35-62°. In the seventh O site, O(3) is bonded to two equivalent Ba(1), two equivalent Ba(2), and two equivalent In(1) atoms to form distorted OBa4In2 octahedra that share corners with two equivalent O(6)Ba4In2 octahedra, corners with two equivalent O(7)Ba4In2 octahedra, corners with two equivalent O(8)Ba4In2 octahedra, corners with four equivalent O(2)Ba3In tetrahedra,  an edgeedge with one O(1)Ba4In2 octahedra, edges with two equivalent O(7)Ba4In2 octahedra, and edges with two equivalent O(2)Ba3In tetrahedra. The corner-sharing octahedral tilt angles range from 3-63°. In the eighth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Ba(1), one In(1), and one In(2) atom.