Bi6Cr2O15 crystallizes in the orthorhombic Ccc2 space group. Cr(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are three inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 5-coordinate geometry to one O(3), one O(4), one O(7), and two equivalent O(5) atoms. In the second Bi site, Bi(2) is bonded in a 4-coordinate geometry to one O(1), one O(7), and two equivalent O(6) atoms. In the third Bi site, Bi(3) is bonded in a 5-coordinate geometry to one O(5), one O(6), one O(7), and two equivalent O(8) atoms. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cr(1) and one Bi(2) atom. In the second O site, O(2) is bonded in a single-bond geometry to one Cr(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Cr(1) and one Bi(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Cr(1) and one Bi(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Bi(3) and two equivalent Bi(1) atoms. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Bi(3) and two equivalent Bi(2) atoms. In the seventh O site, O(7) is bonded in a trigonal non-coplanar geometry to one Bi(1), one Bi(2), and one Bi(3) atom. In the eighth O site, O(8) is bonded to four equivalent Bi(3) atoms to form distorted edge-sharing OBi4 tetrahedra.
Bi6Cr2O15 crystallizes in the orthorhombic Ccc2 space group. Cr(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The Cr(1)-O(1) bond length is 1.66 Å. The Cr(1)-O(2) bond length is 1.63 Å. The Cr(1)-O(3) bond length is 1.67 Å. The Cr(1)-O(4) bond length is 1.65 Å. There are three inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 5-coordinate geometry to one O(3), one O(4), one O(7), and two equivalent O(5) atoms. The Bi(1)-O(3) bond length is 2.50 Å. The Bi(1)-O(4) bond length is 2.65 Å. The Bi(1)-O(7) bond length is 2.14 Å. There is one shorter (2.14 Å) and one longer (2.20 Å) Bi(1)-O(5) bond length. In the second Bi site, Bi(2) is bonded in a 4-coordinate geometry to one O(1), one O(7), and two equivalent O(6) atoms. The Bi(2)-O(1) bond length is 2.43 Å. The Bi(2)-O(7) bond length is 2.21 Å. There is one shorter (2.11 Å) and one longer (2.18 Å) Bi(2)-O(6) bond length. In the third Bi site, Bi(3) is bonded in a 5-coordinate geometry to one O(5), one O(6), one O(7), and two equivalent O(8) atoms. The Bi(3)-O(5) bond length is 2.34 Å. The Bi(3)-O(6) bond length is 2.31 Å. The Bi(3)-O(7) bond length is 2.25 Å. There is one shorter (2.15 Å) and one longer (2.63 Å) Bi(3)-O(8) bond length. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cr(1) and one Bi(2) atom. In the second O site, O(2) is bonded in a single-bond geometry to one Cr(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Cr(1) and one Bi(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Cr(1) and one Bi(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Bi(3) and two equivalent Bi(1) atoms. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Bi(3) and two equivalent Bi(2) atoms. In the seventh O site, O(7) is bonded in a trigonal non-coplanar geometry to one Bi(1), one Bi(2), and one Bi(3) atom. In the eighth O site, O(8) is bonded to four equivalent Bi(3) atoms to form distorted edge-sharing OBi4 tetrahedra.