Ba2Ti4Cr2O13 crystallizes in the monoclinic C2/m space group. Ba(1) is bonded in a 11-coordinate geometry to one O(7), two equivalent O(1), two equivalent O(3), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(4), one O(6), one O(7), and two equivalent O(5) atoms to form distorted TiO6 octahedra that share  a cornercorner with one Cr(1)O6 octahedra, corners with three equivalent Ti(1)O6 octahedra,  an edgeedge with one Ti(2)O6 octahedra, and edges with two equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-16°. In the second Ti site, Ti(2) is bonded to one O(3), one O(6), one O(7), and three equivalent O(2) atoms to form distorted TiO6 octahedra that share corners with two equivalent Ti(2)O6 octahedra,  an edgeedge with one Ti(1)O6 octahedra, edges with two equivalent Ti(2)O6 octahedra, and edges with three equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles are 29°. Cr(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(7) atoms to form CrO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra, corners with two equivalent Cr(1)O6 octahedra, edges with two equivalent Ti(1)O6 octahedra, and edges with three equivalent Ti(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 13-17°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to four equivalent Ba(1) and two equivalent Ti(1) atoms. In the second O site, O(2) is bonded to three equivalent Ti(2) and one Cr(1) atom to form distorted OTi3Cr trigonal pyramids that share  a cornercorner with one O(7)BaTi2Cr2 trigonal pyramid, corners with two equivalent O(2)Ti3Cr trigonal pyramids, edges with two equivalent O(7)BaTi2Cr2 trigonal pyramids, and edges with two equivalent O(2)Ti3Cr trigonal pyramids. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Ba(1), one Ti(2), and one Cr(1) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to two equivalent Ba(1), one Ti(1), and one Cr(1) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to two equivalent Ba(1), two equivalent Ti(1), and one Cr(1) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Ba(1), one Ti(1), and one Ti(2) atom. In the seventh O site, O(7) is bonded to one Ba(1), one Ti(1), one Ti(2), and two equivalent Cr(1) atoms to form distorted OBaTi2Cr2 trigonal pyramids that share  a cornercorner with one O(2)Ti3Cr trigonal pyramid, corners with two equivalent O(7)BaTi2Cr2 trigonal pyramids, and edges with two equivalent O(2)Ti3Cr trigonal pyramids.
Ba2Ti4Cr2O13 crystallizes in the monoclinic C2/m space group. Ba(1) is bonded in a 11-coordinate geometry to one O(7), two equivalent O(1), two equivalent O(3), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. The Ba(1)-O(7) bond length is 3.24 Å. Both Ba(1)-O(1) bond lengths are 3.07 Å. Both Ba(1)-O(3) bond lengths are 2.80 Å. Both Ba(1)-O(4) bond lengths are 2.86 Å. There is one shorter (3.11 Å) and one longer (3.22 Å) Ba(1)-O(5) bond length. Both Ba(1)-O(6) bond lengths are 2.71 Å. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(4), one O(6), one O(7), and two equivalent O(5) atoms to form distorted TiO6 octahedra that share  a cornercorner with one Cr(1)O6 octahedra, corners with three equivalent Ti(1)O6 octahedra,  an edgeedge with one Ti(2)O6 octahedra, and edges with two equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-16°. The Ti(1)-O(1) bond length is 1.94 Å. The Ti(1)-O(4) bond length is 1.79 Å. The Ti(1)-O(6) bond length is 2.29 Å. The Ti(1)-O(7) bond length is 2.07 Å. Both Ti(1)-O(5) bond lengths are 1.99 Å. In the second Ti site, Ti(2) is bonded to one O(3), one O(6), one O(7), and three equivalent O(2) atoms to form distorted TiO6 octahedra that share corners with two equivalent Ti(2)O6 octahedra,  an edgeedge with one Ti(1)O6 octahedra, edges with two equivalent Ti(2)O6 octahedra, and edges with three equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles are 29°. The Ti(2)-O(3) bond length is 1.83 Å. The Ti(2)-O(6) bond length is 1.78 Å. The Ti(2)-O(7) bond length is 2.22 Å. There are two shorter (2.04 Å) and one longer (2.24 Å) Ti(2)-O(2) bond length. Cr(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(7) atoms to form CrO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra, corners with two equivalent Cr(1)O6 octahedra, edges with two equivalent Ti(1)O6 octahedra, and edges with three equivalent Ti(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 13-17°. The Cr(1)-O(2) bond length is 2.04 Å. The Cr(1)-O(3) bond length is 2.02 Å. The Cr(1)-O(4) bond length is 1.99 Å. The Cr(1)-O(5) bond length is 2.06 Å. Both Cr(1)-O(7) bond lengths are 2.00 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to four equivalent Ba(1) and two equivalent Ti(1) atoms. In the second O site, O(2) is bonded to three equivalent Ti(2) and one Cr(1) atom to form distorted OTi3Cr trigonal pyramids that share  a cornercorner with one O(7)BaTi2Cr2 trigonal pyramid, corners with two equivalent O(2)Ti3Cr trigonal pyramids, edges with two equivalent O(7)BaTi2Cr2 trigonal pyramids, and edges with two equivalent O(2)Ti3Cr trigonal pyramids. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Ba(1), one Ti(2), and one Cr(1) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to two equivalent Ba(1), one Ti(1), and one Cr(1) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to two equivalent Ba(1), two equivalent Ti(1), and one Cr(1) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Ba(1), one Ti(1), and one Ti(2) atom. In the seventh O site, O(7) is bonded to one Ba(1), one Ti(1), one Ti(2), and two equivalent Cr(1) atoms to form distorted OBaTi2Cr2 trigonal pyramids that share  a cornercorner with one O(2)Ti3Cr trigonal pyramid, corners with two equivalent O(7)BaTi2Cr2 trigonal pyramids, and edges with two equivalent O(2)Ti3Cr trigonal pyramids.