Ba6MgCo2(Sb2O9)2 crystallizes in the triclinic P1 space group. There are six inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to one Co(2), one O(14), one O(15), one O(16), one O(4), one O(6), and two equivalent O(7) atoms. In the second Ba site, Ba(2) is bonded to one O(10), one O(11), one O(13), one O(17), one O(18), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form BaO12 cuboctahedra that share corners with six equivalent Ba(2)O12 cuboctahedra, corners with three equivalent Sb(4)O6 octahedra, faces with three equivalent Ba(4)O12 cuboctahedra,  a faceface with one Sb(3)O6 octahedra, faces with three equivalent Co(1)O6 octahedra, and faces with three equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-16°. In the third Ba site, Ba(3) is bonded in a 9-coordinate geometry to one O(13), one O(17), one O(18), two equivalent O(12), two equivalent O(8), and two equivalent O(9) atoms. In the fourth Ba site, Ba(4) is bonded to one O(1), one O(14), one O(15), one O(16), one O(2), one O(3), two equivalent O(10), two equivalent O(11), and two equivalent O(5) atoms to form BaO12 cuboctahedra that share corners with six equivalent Ba(4)O12 cuboctahedra, corners with three equivalent Sb(2)O6 octahedra, faces with three equivalent Ba(2)O12 cuboctahedra,  a faceface with one Sb(1)O6 octahedra, faces with three equivalent Co(1)O6 octahedra, and faces with three equivalent Sb(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-11°. In the fifth Ba site, Ba(5) is bonded in a 12-coordinate geometry to one O(10), one O(11), one O(4), one O(5), one O(6), one O(7), two equivalent O(14), two equivalent O(15), and two equivalent O(16) atoms. In the sixth Ba site, Ba(6) is bonded in a 12-coordinate geometry to one O(1), one O(12), one O(2), one O(3), one O(8), one O(9), two equivalent O(13), two equivalent O(17), and two equivalent O(18) atoms. Mg(1) is bonded to one O(12), one O(7), one O(8), and one O(9) atom to form distorted MgO4 tetrahedra that share  a cornercorner with one Sb(2)O6 octahedra and corners with three equivalent Sb(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-40°. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(10), one O(11), one O(2), one O(3), and one O(5) atom to form CoO6 octahedra that share corners with three equivalent Sb(1)O6 octahedra, corners with three equivalent Sb(3)O6 octahedra, faces with three equivalent Ba(2)O12 cuboctahedra, and faces with three equivalent Ba(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 3-11°. In the second Co site, Co(2) is bonded in a distorted trigonal planar geometry to one Ba(1), one O(12), one O(4), and one O(6) atom. There are four inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(1), one O(13), one O(17), one O(18), one O(2), and one O(3) atom to form distorted SbO6 octahedra that share corners with three equivalent Co(1)O6 octahedra,  a faceface with one Ba(4)O12 cuboctahedra, faces with three equivalent Ba(2)O12 cuboctahedra, and  a faceface with one Sb(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-9°. In the second Sb site, Sb(2) is bonded to one O(14), one O(15), one O(16), one O(4), one O(6), and one O(7) atom to form SbO6 octahedra that share corners with three equivalent Ba(4)O12 cuboctahedra,  a cornercorner with one Mg(1)O4 tetrahedra, and  a faceface with one Sb(3)O6 octahedra. In the third Sb site, Sb(3) is bonded to one O(10), one O(11), one O(14), one O(15), one O(16), and one O(5) atom to form SbO6 octahedra that share corners with three equivalent Co(1)O6 octahedra,  a faceface with one Ba(2)O12 cuboctahedra, faces with three equivalent Ba(4)O12 cuboctahedra, and  a faceface with one Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-11°. In the fourth Sb site, Sb(4) is bonded to one O(12), one O(13), one O(17), one O(18), one O(8), and one O(9) atom to form SbO6 octahedra that share corners with three equivalent Ba(2)O12 cuboctahedra, corners with three equivalent Mg(1)O4 tetrahedra, and  a faceface with one Sb(1)O6 octahedra. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded to one Ba(4), one Ba(6), two equivalent Ba(2), one Co(1), and one Sb(1) atom to form distorted OBa4CoSb octahedra that share  a cornercorner with one O(16)Ba4Sb2 octahedra, corners with two equivalent O(1)Ba4CoSb octahedra, corners with two equivalent O(2)Ba4CoSb octahedra, corners with two equivalent O(3)Ba4CoSb octahedra, corners with two equivalent O(13)Ba4Sb2 octahedra,  a faceface with one O(13)Ba4Sb2 octahedra, faces with two equivalent O(2)Ba4CoSb octahedra, and faces with two equivalent O(3)Ba4CoSb octahedra. The corner-sharing octahedral tilt angles range from 1-63°. In the second O site, O(2) is bonded to one Ba(4), one Ba(6), two equivalent Ba(2), one Co(1), and one Sb(1) atom to form distorted OBa4CoSb octahedra that share  a cornercorner with one O(13)Ba4Sb2 octahedra,  a cornercorner with one O(16)Ba4Sb2 octahedra, corners with two equivalent O(1)Ba4CoSb octahedra, corners with two equivalent O(2)Ba4CoSb octahedra, corners with two equivalent O(3)Ba4CoSb octahedra, edges with two equivalent O(13)Ba4Sb2 octahedra, faces with two equivalent O(1)Ba4CoSb octahedra, and faces with two equivalent O(3)Ba4CoSb octahedra. The corner-sharing octahedral tilt angles range from 3-61°. In the third O site, O(3) is bonded to one Ba(4), one Ba(6), two equivalent Ba(2), one Co(1), and one Sb(1) atom to form distorted OBa4CoSb octahedra that share  a cornercorner with one O(16)Ba4Sb2 octahedra, corners with two equivalent O(1)Ba4CoSb octahedra, corners with two equivalent O(2)Ba4CoSb octahedra, corners with two equivalent O(3)Ba4CoSb octahedra, corners with two equivalent O(13)Ba4Sb2 octahedra,  a faceface with one O(13)Ba4Sb2 octahedra, faces with two equivalent O(1)Ba4CoSb octahedra, and faces with two equivalent O(2)Ba4CoSb octahedra. The corner-sharing octahedral tilt angles range from 1-63°. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Ba(1), one Ba(5), one Co(2), and one Sb(2) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Ba(2), one Ba(5), two equivalent Ba(4), one Co(1), and one Sb(3) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Ba(1), one Ba(5), one Co(2), and one Sb(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Ba(5), two equivalent Ba(1), one Mg(1), and one Sb(2) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Ba(6), two equivalent Ba(3), one Mg(1), and one Sb(4) atom. In the ninth O site, O(9) is bonded in a distorted linear geometry to one Ba(6), two equivalent Ba(3), one Mg(1), and one Sb(4) atom. In the tenth O site, O(10) is bonded in a 6-coordinate geometry to one Ba(2), one Ba(5), two equivalent Ba(4), one Co(1), and one Sb(3) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one Ba(2), one Ba(5), two equivalent Ba(4), one Co(1), and one Sb(3) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Ba(6), two equivalent Ba(3), one Mg(1), one Co(2), and one Sb(4) atom. In the thirteenth O site, O(13) is bonded to one Ba(2), one Ba(3), two equivalent Ba(6), one Sb(1), and one Sb(4) atom to form distorted OBa4Sb2 octahedra that share  a cornercorner with one O(2)Ba4CoSb octahedra, corners with two equivalent O(1)Ba4CoSb octahedra, corners with two equivalent O(3)Ba4CoSb octahedra, corners with two equivalent O(13)Ba4Sb2 octahedra, edges with two equivalent O(2)Ba4CoSb octahedra,  a faceface with one O(1)Ba4CoSb octahedra, and  a faceface with one O(3)Ba4CoSb octahedra. The corner-sharing octahedral tilt angles range from 12-59°. In the fourteenth O site, O(14) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(4), two equivalent Ba(5), one Sb(2), and one Sb(3) atom. In the fifteenth O site, O(15) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(4), two equivalent Ba(5), one Sb(2), and one Sb(3) atom. In the sixteenth O site, O(16) is bonded to one Ba(1), one Ba(4), two equivalent Ba(5), one Sb(2), and one Sb(3) atom to form distorted OBa4Sb2 octahedra that share  a cornercorner with one O(1)Ba4CoSb octahedra,  a cornercorner with one O(2)Ba4CoSb octahedra,  a cornercorner with one O(3)Ba4CoSb octahedra, and corners with two equivalent O(16)Ba4Sb2 octahedra. The corner-sharing octahedral tilt angles range from 3-63°. In the seventeenth O site, O(17) is bonded in a 6-coordinate geometry to one Ba(2), one Ba(3), two equivalent Ba(6), one Sb(1), and one Sb(4) atom. In the eighteenth O site, O(18) is bonded in a 6-coordinate geometry to one Ba(2), one Ba(3), two equivalent Ba(6), one Sb(1), and one Sb(4) atom.
Ba6MgCo2(Sb2O9)2 crystallizes in the triclinic P1 space group. There are six inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to one Co(2), one O(14), one O(15), one O(16), one O(4), one O(6), and two equivalent O(7) atoms. The Ba(1)-Co(2) bond length is 3.06 Å. The Ba(1)-O(14) bond length is 2.83 Å. The Ba(1)-O(15) bond length is 2.83 Å. The Ba(1)-O(16) bond length is 2.96 Å. The Ba(1)-O(4) bond length is 2.73 Å. The Ba(1)-O(6) bond length is 2.73 Å. There is one shorter (3.05 Å) and one longer (3.06 Å) Ba(1)-O(7) bond length. In the second Ba site, Ba(2) is bonded to one O(10), one O(11), one O(13), one O(17), one O(18), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form BaO12 cuboctahedra that share corners with six equivalent Ba(2)O12 cuboctahedra, corners with three equivalent Sb(4)O6 octahedra, faces with three equivalent Ba(4)O12 cuboctahedra,  a faceface with one Sb(3)O6 octahedra, faces with three equivalent Co(1)O6 octahedra, and faces with three equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-16°. The Ba(2)-O(10) bond length is 2.93 Å. The Ba(2)-O(11) bond length is 2.94 Å. The Ba(2)-O(13) bond length is 3.18 Å. The Ba(2)-O(17) bond length is 3.35 Å. The Ba(2)-O(18) bond length is 3.36 Å. The Ba(2)-O(5) bond length is 3.13 Å. There is one shorter (3.01 Å) and one longer (3.05 Å) Ba(2)-O(1) bond length. There is one shorter (3.00 Å) and one longer (3.02 Å) Ba(2)-O(2) bond length. There is one shorter (3.01 Å) and one longer (3.06 Å) Ba(2)-O(3) bond length. In the third Ba site, Ba(3) is bonded in a 9-coordinate geometry to one O(13), one O(17), one O(18), two equivalent O(12), two equivalent O(8), and two equivalent O(9) atoms. The Ba(3)-O(13) bond length is 2.80 Å. The Ba(3)-O(17) bond length is 2.70 Å. The Ba(3)-O(18) bond length is 2.69 Å. There is one shorter (3.05 Å) and one longer (3.06 Å) Ba(3)-O(12) bond length. There is one shorter (2.89 Å) and one longer (3.22 Å) Ba(3)-O(8) bond length. There is one shorter (2.91 Å) and one longer (3.20 Å) Ba(3)-O(9) bond length. In the fourth Ba site, Ba(4) is bonded to one O(1), one O(14), one O(15), one O(16), one O(2), one O(3), two equivalent O(10), two equivalent O(11), and two equivalent O(5) atoms to form BaO12 cuboctahedra that share corners with six equivalent Ba(4)O12 cuboctahedra, corners with three equivalent Sb(2)O6 octahedra, faces with three equivalent Ba(2)O12 cuboctahedra,  a faceface with one Sb(1)O6 octahedra, faces with three equivalent Co(1)O6 octahedra, and faces with three equivalent Sb(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-11°. The Ba(4)-O(1) bond length is 2.97 Å. The Ba(4)-O(14) bond length is 3.24 Å. The Ba(4)-O(15) bond length is 3.25 Å. The Ba(4)-O(16) bond length is 3.05 Å. The Ba(4)-O(2) bond length is 3.09 Å. The Ba(4)-O(3) bond length is 2.96 Å. There is one shorter (2.95 Å) and one longer (3.11 Å) Ba(4)-O(10) bond length. There is one shorter (2.95 Å) and one longer (3.12 Å) Ba(4)-O(11) bond length. Both Ba(4)-O(5) bond lengths are 3.01 Å. In the fifth Ba site, Ba(5) is bonded in a 12-coordinate geometry to one O(10), one O(11), one O(4), one O(5), one O(6), one O(7), two equivalent O(14), two equivalent O(15), and two equivalent O(16) atoms. The Ba(5)-O(10) bond length is 2.99 Å. The Ba(5)-O(11) bond length is 2.98 Å. The Ba(5)-O(4) bond length is 2.97 Å. The Ba(5)-O(5) bond length is 2.77 Å. The Ba(5)-O(6) bond length is 2.99 Å. The Ba(5)-O(7) bond length is 3.41 Å. There is one shorter (3.02 Å) and one longer (3.08 Å) Ba(5)-O(14) bond length. There is one shorter (3.02 Å) and one longer (3.08 Å) Ba(5)-O(15) bond length. There is one shorter (3.01 Å) and one longer (3.02 Å) Ba(5)-O(16) bond length. In the sixth Ba site, Ba(6) is bonded in a 12-coordinate geometry to one O(1), one O(12), one O(2), one O(3), one O(8), one O(9), two equivalent O(13), two equivalent O(17), and two equivalent O(18) atoms. The Ba(6)-O(1) bond length is 2.92 Å. The Ba(6)-O(12) bond length is 3.44 Å. The Ba(6)-O(2) bond length is 2.79 Å. The Ba(6)-O(3) bond length is 2.92 Å. The Ba(6)-O(8) bond length is 3.22 Å. The Ba(6)-O(9) bond length is 3.20 Å. There is one shorter (3.02 Å) and one longer (3.03 Å) Ba(6)-O(13) bond length. There is one shorter (3.02 Å) and one longer (3.11 Å) Ba(6)-O(17) bond length. There is one shorter (3.01 Å) and one longer (3.12 Å) Ba(6)-O(18) bond length. Mg(1) is bonded to one O(12), one O(7), one O(8), and one O(9) atom to form distorted MgO4 tetrahedra that share  a cornercorner with one Sb(2)O6 octahedra and corners with three equivalent Sb(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-40°. The Mg(1)-O(12) bond length is 2.18 Å. The Mg(1)-O(7) bond length is 1.98 Å. The Mg(1)-O(8) bond length is 1.92 Å. The Mg(1)-O(9) bond length is 1.92 Å. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(10), one O(11), one O(2), one O(3), and one O(5) atom to form CoO6 octahedra that share corners with three equivalent Sb(1)O6 octahedra, corners with three equivalent Sb(3)O6 octahedra, faces with three equivalent Ba(2)O12 cuboctahedra, and faces with three equivalent Ba(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 3-11°. The Co(1)-O(1) bond length is 2.11 Å. The Co(1)-O(10) bond length is 2.20 Å. The Co(1)-O(11) bond length is 2.19 Å. The Co(1)-O(2) bond length is 2.10 Å. The Co(1)-O(3) bond length is 2.10 Å. The Co(1)-O(5) bond length is 2.25 Å. In the second Co site, Co(2) is bonded in a distorted trigonal planar geometry to one Ba(1), one O(12), one O(4), and one O(6) atom. The Co(2)-O(12) bond length is 1.92 Å. The Co(2)-O(4) bond length is 1.92 Å. The Co(2)-O(6) bond length is 1.92 Å. There are four inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(1), one O(13), one O(17), one O(18), one O(2), and one O(3) atom to form distorted SbO6 octahedra that share corners with three equivalent Co(1)O6 octahedra,  a faceface with one Ba(4)O12 cuboctahedra, faces with three equivalent Ba(2)O12 cuboctahedra, and  a faceface with one Sb(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-9°. The Sb(1)-O(1) bond length is 2.03 Å. The Sb(1)-O(13) bond length is 2.26 Å. The Sb(1)-O(17) bond length is 2.29 Å. The Sb(1)-O(18) bond length is 2.29 Å. The Sb(1)-O(2) bond length is 2.05 Å. The Sb(1)-O(3) bond length is 2.04 Å. In the second Sb site, Sb(2) is bonded to one O(14), one O(15), one O(16), one O(4), one O(6), and one O(7) atom to form SbO6 octahedra that share corners with three equivalent Ba(4)O12 cuboctahedra,  a cornercorner with one Mg(1)O4 tetrahedra, and  a faceface with one Sb(3)O6 octahedra. The Sb(2)-O(14) bond length is 2.10 Å. The Sb(2)-O(15) bond length is 2.10 Å. The Sb(2)-O(16) bond length is 2.15 Å. The Sb(2)-O(4) bond length is 1.97 Å. The Sb(2)-O(6) bond length is 1.97 Å. The Sb(2)-O(7) bond length is 1.95 Å. In the third Sb site, Sb(3) is bonded to one O(10), one O(11), one O(14), one O(15), one O(16), and one O(5) atom to form SbO6 octahedra that share corners with three equivalent Co(1)O6 octahedra,  a faceface with one Ba(2)O12 cuboctahedra, faces with three equivalent Ba(4)O12 cuboctahedra, and  a faceface with one Sb(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-11°. The Sb(3)-O(10) bond length is 1.97 Å. The Sb(3)-O(11) bond length is 1.97 Å. The Sb(3)-O(14) bond length is 2.13 Å. The Sb(3)-O(15) bond length is 2.13 Å. The Sb(3)-O(16) bond length is 2.08 Å. The Sb(3)-O(5) bond length is 1.98 Å. In the fourth Sb site, Sb(4) is bonded to one O(12), one O(13), one O(17), one O(18), one O(8), and one O(9) atom to form SbO6 octahedra that share corners with three equivalent Ba(2)O12 cuboctahedra, corners with three equivalent Mg(1)O4 tetrahedra, and  a faceface with one Sb(1)O6 octahedra. The Sb(4)-O(12) bond length is 2.03 Å. The Sb(4)-O(13) bond length is 2.08 Å. The Sb(4)-O(17) bond length is 2.06 Å. The Sb(4)-O(18) bond length is 2.06 Å. The Sb(4)-O(8) bond length is 1.98 Å. The Sb(4)-O(9) bond length is 1.97 Å. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded to one Ba(4), one Ba(6), two equivalent Ba(2), one Co(1), and one Sb(1) atom to form distorted OBa4CoSb octahedra that share  a cornercorner with one O(16)Ba4Sb2 octahedra, corners with two equivalent O(1)Ba4CoSb octahedra, corners with two equivalent O(2)Ba4CoSb octahedra, corners with two equivalent O(3)Ba4CoSb octahedra, corners with two equivalent O(13)Ba4Sb2 octahedra,  a faceface with one O(13)Ba4Sb2 octahedra, faces with two equivalent O(2)Ba4CoSb octahedra, and faces with two equivalent O(3)Ba4CoSb octahedra. The corner-sharing octahedral tilt angles range from 1-63°. In the second O site, O(2) is bonded to one Ba(4), one Ba(6), two equivalent Ba(2), one Co(1), and one Sb(1) atom to form distorted OBa4CoSb octahedra that share  a cornercorner with one O(13)Ba4Sb2 octahedra,  a cornercorner with one O(16)Ba4Sb2 octahedra, corners with two equivalent O(1)Ba4CoSb octahedra, corners with two equivalent O(2)Ba4CoSb octahedra, corners with two equivalent O(3)Ba4CoSb octahedra, edges with two equivalent O(13)Ba4Sb2 octahedra, faces with two equivalent O(1)Ba4CoSb octahedra, and faces with two equivalent O(3)Ba4CoSb octahedra. The corner-sharing octahedral tilt angles range from 3-61°. In the third O site, O(3) is bonded to one Ba(4), one Ba(6), two equivalent Ba(2), one Co(1), and one Sb(1) atom to form distorted OBa4CoSb octahedra that share  a cornercorner with one O(16)Ba4Sb2 octahedra, corners with two equivalent O(1)Ba4CoSb octahedra, corners with two equivalent O(2)Ba4CoSb octahedra, corners with two equivalent O(3)Ba4CoSb octahedra, corners with two equivalent O(13)Ba4Sb2 octahedra,  a faceface with one O(13)Ba4Sb2 octahedra, faces with two equivalent O(1)Ba4CoSb octahedra, and faces with two equivalent O(2)Ba4CoSb octahedra. The corner-sharing octahedral tilt angles range from 1-63°. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Ba(1), one Ba(5), one Co(2), and one Sb(2) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Ba(2), one Ba(5), two equivalent Ba(4), one Co(1), and one Sb(3) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Ba(1), one Ba(5), one Co(2), and one Sb(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Ba(5), two equivalent Ba(1), one Mg(1), and one Sb(2) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Ba(6), two equivalent Ba(3), one Mg(1), and one Sb(4) atom. In the ninth O site, O(9) is bonded in a distorted linear geometry to one Ba(6), two equivalent Ba(3), one Mg(1), and one Sb(4) atom. In the tenth O site, O(10) is bonded in a 6-coordinate geometry to one Ba(2), one Ba(5), two equivalent Ba(4), one Co(1), and one Sb(3) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one Ba(2), one Ba(5), two equivalent Ba(4), one Co(1), and one Sb(3) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Ba(6), two equivalent Ba(3), one Mg(1), one Co(2), and one Sb(4) atom. In the thirteenth O site, O(13) is bonded to one Ba(2), one Ba(3), two equivalent Ba(6), one Sb(1), and one Sb(4) atom to form distorted OBa4Sb2 octahedra that share  a cornercorner with one O(2)Ba4CoSb octahedra, corners with two equivalent O(1)Ba4CoSb octahedra, corners with two equivalent O(3)Ba4CoSb octahedra, corners with two equivalent O(13)Ba4Sb2 octahedra, edges with two equivalent O(2)Ba4CoSb octahedra,  a faceface with one O(1)Ba4CoSb octahedra, and  a faceface with one O(3)Ba4CoSb octahedra. The corner-sharing octahedral tilt angles range from 12-59°. In the fourteenth O site, O(14) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(4), two equivalent Ba(5), one Sb(2), and one Sb(3) atom. In the fifteenth O site, O(15) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(4), two equivalent Ba(5), one Sb(2), and one Sb(3) atom. In the sixteenth O site, O(16) is bonded to one Ba(1), one Ba(4), two equivalent Ba(5), one Sb(2), and one Sb(3) atom to form distorted OBa4Sb2 octahedra that share  a cornercorner with one O(1)Ba4CoSb octahedra,  a cornercorner with one O(2)Ba4CoSb octahedra,  a cornercorner with one O(3)Ba4CoSb octahedra, and corners with two equivalent O(16)Ba4Sb2 octahedra. The corner-sharing octahedral tilt angles range from 3-63°. In the seventeenth O site, O(17) is bonded in a 6-coordinate geometry to one Ba(2), one Ba(3), two equivalent Ba(6), one Sb(1), and one Sb(4) atom. In the eighteenth O site, O(18) is bonded in a 6-coordinate geometry to one Ba(2), one Ba(3), two equivalent Ba(6), one Sb(1), and one Sb(4) atom.