Ba4Mg(Co2O5)2 crystallizes in the triclinic P1 space group. There are four inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(7), and one O(9) atom. In the second Ba site, Ba(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(6), and one O(8) atom. In the third Ba site, Ba(3) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(2), one O(4), one O(9), two equivalent O(5), and two equivalent O(7) atoms. In the fourth Ba site, Ba(4) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(4), one O(6), one O(8), and one O(9) atom. Mg(1) is bonded in a 4-coordinate geometry to one O(10), one O(3), one O(6), and one O(8) atom. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form corner-sharing CoO4 tetrahedra. In the second Co site, Co(2) is bonded to one O(2), one O(3), one O(4), and one O(7) atom to form corner-sharing CoO4 tetrahedra. In the third Co site, Co(3) is bonded to one O(10), one O(5), one O(8), and one O(9) atom to form corner-sharing CoO4 tetrahedra. In the fourth Co site, Co(4) is bonded in a distorted see-saw-like geometry to one O(10), one O(6), one O(7), and one O(9) atom. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Ba(1), one Ba(2), one Ba(3), one Ba(4), and one Co(1) atom to form distorted edge-sharing OBa4Co trigonal bipyramids. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(2), one Ba(3), one Ba(4), one Co(1), and one Co(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ba(1), one Ba(2), one Mg(1), one Co(1), and one Co(2) atom. In the fourth O site, O(4) is bonded to one Ba(1), one Ba(2), one Ba(3), one Ba(4), and one Co(2) atom to form distorted edge-sharing OBa4Co trigonal bipyramids. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Ba(1), two equivalent Ba(3), one Co(1), and one Co(3) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ba(2), one Ba(4), one Mg(1), and one Co(4) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one Ba(1), two equivalent Ba(3), one Co(2), and one Co(4) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Ba(2), one Ba(4), one Mg(1), and one Co(3) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(3), one Ba(4), one Co(3), and one Co(4) atom. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Ba(2), one Ba(3), one Mg(1), one Co(3), and one Co(4) atom.
Ba4Mg(Co2O5)2 crystallizes in the triclinic P1 space group. There are four inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(7), and one O(9) atom. The Ba(1)-O(1) bond length is 2.72 Å. The Ba(1)-O(2) bond length is 3.24 Å. The Ba(1)-O(3) bond length is 2.74 Å. The Ba(1)-O(4) bond length is 2.69 Å. The Ba(1)-O(5) bond length is 2.81 Å. The Ba(1)-O(7) bond length is 2.85 Å. The Ba(1)-O(9) bond length is 2.71 Å. In the second Ba site, Ba(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(4), one O(6), and one O(8) atom. The Ba(2)-O(1) bond length is 2.77 Å. The Ba(2)-O(10) bond length is 3.03 Å. The Ba(2)-O(2) bond length is 2.71 Å. The Ba(2)-O(3) bond length is 3.07 Å. The Ba(2)-O(4) bond length is 2.78 Å. The Ba(2)-O(6) bond length is 2.61 Å. The Ba(2)-O(8) bond length is 2.69 Å. In the third Ba site, Ba(3) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(2), one O(4), one O(9), two equivalent O(5), and two equivalent O(7) atoms. The Ba(3)-O(1) bond length is 2.64 Å. The Ba(3)-O(10) bond length is 2.73 Å. The Ba(3)-O(2) bond length is 2.80 Å. The Ba(3)-O(4) bond length is 2.66 Å. The Ba(3)-O(9) bond length is 3.41 Å. There is one shorter (3.01 Å) and one longer (3.36 Å) Ba(3)-O(5) bond length. There is one shorter (3.03 Å) and one longer (3.31 Å) Ba(3)-O(7) bond length. In the fourth Ba site, Ba(4) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(4), one O(6), one O(8), and one O(9) atom. The Ba(4)-O(1) bond length is 2.68 Å. The Ba(4)-O(2) bond length is 2.55 Å. The Ba(4)-O(4) bond length is 2.69 Å. The Ba(4)-O(6) bond length is 2.78 Å. The Ba(4)-O(8) bond length is 2.92 Å. The Ba(4)-O(9) bond length is 2.93 Å. Mg(1) is bonded in a 4-coordinate geometry to one O(10), one O(3), one O(6), and one O(8) atom. The Mg(1)-O(10) bond length is 2.04 Å. The Mg(1)-O(3) bond length is 1.94 Å. The Mg(1)-O(6) bond length is 2.03 Å. The Mg(1)-O(8) bond length is 2.03 Å. There are four inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form corner-sharing CoO4 tetrahedra. The Co(1)-O(1) bond length is 1.93 Å. The Co(1)-O(2) bond length is 2.06 Å. The Co(1)-O(3) bond length is 2.05 Å. The Co(1)-O(5) bond length is 2.05 Å. In the second Co site, Co(2) is bonded to one O(2), one O(3), one O(4), and one O(7) atom to form corner-sharing CoO4 tetrahedra. The Co(2)-O(2) bond length is 2.03 Å. The Co(2)-O(3) bond length is 2.03 Å. The Co(2)-O(4) bond length is 1.94 Å. The Co(2)-O(7) bond length is 2.05 Å. In the third Co site, Co(3) is bonded to one O(10), one O(5), one O(8), and one O(9) atom to form corner-sharing CoO4 tetrahedra. The Co(3)-O(10) bond length is 1.96 Å. The Co(3)-O(5) bond length is 1.79 Å. The Co(3)-O(8) bond length is 1.85 Å. The Co(3)-O(9) bond length is 2.04 Å. In the fourth Co site, Co(4) is bonded in a distorted see-saw-like geometry to one O(10), one O(6), one O(7), and one O(9) atom. The Co(4)-O(10) bond length is 2.06 Å. The Co(4)-O(6) bond length is 1.87 Å. The Co(4)-O(7) bond length is 1.80 Å. The Co(4)-O(9) bond length is 1.97 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Ba(1), one Ba(2), one Ba(3), one Ba(4), and one Co(1) atom to form distorted edge-sharing OBa4Co trigonal bipyramids. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Ba(1), one Ba(2), one Ba(3), one Ba(4), one Co(1), and one Co(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ba(1), one Ba(2), one Mg(1), one Co(1), and one Co(2) atom. In the fourth O site, O(4) is bonded to one Ba(1), one Ba(2), one Ba(3), one Ba(4), and one Co(2) atom to form distorted edge-sharing OBa4Co trigonal bipyramids. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Ba(1), two equivalent Ba(3), one Co(1), and one Co(3) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ba(2), one Ba(4), one Mg(1), and one Co(4) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one Ba(1), two equivalent Ba(3), one Co(2), and one Co(4) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Ba(2), one Ba(4), one Mg(1), and one Co(3) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(3), one Ba(4), one Co(3), and one Co(4) atom. In the tenth O site, O(10) is bonded in a 5-coordinate geometry to one Ba(2), one Ba(3), one Mg(1), one Co(3), and one Co(4) atom.