Ba2Mg2Fe3Tl2O10 crystallizes in the triclinic P1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to one O(9), two equivalent O(6), two equivalent O(8), and four equivalent O(7) atoms. In the second Ba site, Ba(2) is bonded in a 9-coordinate geometry to one O(4), two equivalent O(1), two equivalent O(3), and four equivalent O(2) atoms. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 6-coordinate geometry to one O(10), one O(5), two equivalent O(1), and two equivalent O(3) atoms. In the second Mg site, Mg(2) is bonded in a 6-coordinate geometry to one O(10), one O(5), two equivalent O(6), and two equivalent O(8) atoms. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(3) atoms. In the second Fe site, Fe(2) is bonded in a rectangular see-saw-like geometry to one O(7), two equivalent O(6), and two equivalent O(8) atoms. In the third Fe site, Fe(3) is bonded in a rectangular see-saw-like geometry to two equivalent O(10) and two equivalent O(5) atoms. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded in a see-saw-like geometry to one O(4), one O(7), and two equivalent O(9) atoms. In the second Tl site, Tl(2) is bonded in a distorted see-saw-like geometry to one O(2), one O(9), and two equivalent O(4) atoms. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Ba(2), two equivalent Mg(1), and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded in a 5-coordinate geometry to four equivalent Ba(2) and one Tl(2) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Ba(2), two equivalent Mg(1), and two equivalent Fe(1) atoms. In the fourth O site, O(4) is bonded in a distorted see-saw-like geometry to one Ba(2), one Tl(1), and two equivalent Tl(2) atoms. In the fifth O site, O(5) is bonded in a distorted see-saw-like geometry to one Mg(1), one Mg(2), and two equivalent Fe(3) atoms. In the sixth O site, O(6) is bonded to two equivalent Ba(1), two equivalent Mg(2), and two equivalent Fe(2) atoms to form a mixture of distorted corner and edge-sharing OBa2Mg2Fe2 octahedra. The corner-sharing octahedral tilt angles are 3°. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to four equivalent Ba(1), one Fe(2), and one Tl(1) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent Mg(2), and two equivalent Fe(2) atoms. In the ninth O site, O(9) is bonded in a distorted see-saw-like geometry to one Ba(1), one Tl(2), and two equivalent Tl(1) atoms. In the tenth O site, O(10) is bonded in a see-saw-like geometry to one Mg(1), one Mg(2), and two equivalent Fe(3) atoms.
Ba2Mg2Fe3Tl2O10 crystallizes in the triclinic P1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to one O(9), two equivalent O(6), two equivalent O(8), and four equivalent O(7) atoms. The Ba(1)-O(9) bond length is 2.97 Å. There is one shorter (2.87 Å) and one longer (2.89 Å) Ba(1)-O(6) bond length. There is one shorter (2.94 Å) and one longer (3.08 Å) Ba(1)-O(8) bond length. There are a spread of Ba(1)-O(7) bond distances ranging from 2.83-2.88 Å. In the second Ba site, Ba(2) is bonded in a 9-coordinate geometry to one O(4), two equivalent O(1), two equivalent O(3), and four equivalent O(2) atoms. The Ba(2)-O(4) bond length is 2.96 Å. There is one shorter (2.89 Å) and one longer (3.00 Å) Ba(2)-O(1) bond length. There is one shorter (2.95 Å) and one longer (3.04 Å) Ba(2)-O(3) bond length. There are a spread of Ba(2)-O(2) bond distances ranging from 2.81-2.88 Å. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 6-coordinate geometry to one O(10), one O(5), two equivalent O(1), and two equivalent O(3) atoms. The Mg(1)-O(10) bond length is 2.13 Å. The Mg(1)-O(5) bond length is 2.16 Å. There is one shorter (2.25 Å) and one longer (2.43 Å) Mg(1)-O(1) bond length. There is one shorter (2.19 Å) and one longer (2.38 Å) Mg(1)-O(3) bond length. In the second Mg site, Mg(2) is bonded in a 6-coordinate geometry to one O(10), one O(5), two equivalent O(6), and two equivalent O(8) atoms. The Mg(2)-O(10) bond length is 2.11 Å. The Mg(2)-O(5) bond length is 2.16 Å. There is one shorter (2.32 Å) and one longer (2.44 Å) Mg(2)-O(6) bond length. There is one shorter (2.15 Å) and one longer (2.47 Å) Mg(2)-O(8) bond length. There are three inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(3) atoms. There is one shorter (1.96 Å) and one longer (1.97 Å) Fe(1)-O(1) bond length. There is one shorter (1.98 Å) and one longer (1.99 Å) Fe(1)-O(3) bond length. In the second Fe site, Fe(2) is bonded in a rectangular see-saw-like geometry to one O(7), two equivalent O(6), and two equivalent O(8) atoms. The Fe(2)-O(7) bond length is 2.78 Å. There is one shorter (1.97 Å) and one longer (2.00 Å) Fe(2)-O(6) bond length. There is one shorter (1.96 Å) and one longer (1.97 Å) Fe(2)-O(8) bond length. In the third Fe site, Fe(3) is bonded in a rectangular see-saw-like geometry to two equivalent O(10) and two equivalent O(5) atoms. There is one shorter (1.93 Å) and one longer (2.04 Å) Fe(3)-O(10) bond length. There is one shorter (1.93 Å) and one longer (2.06 Å) Fe(3)-O(5) bond length. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded in a see-saw-like geometry to one O(4), one O(7), and two equivalent O(9) atoms. The Tl(1)-O(4) bond length is 2.21 Å. The Tl(1)-O(7) bond length is 2.15 Å. There is one shorter (2.37 Å) and one longer (2.38 Å) Tl(1)-O(9) bond length. In the second Tl site, Tl(2) is bonded in a distorted see-saw-like geometry to one O(2), one O(9), and two equivalent O(4) atoms. The Tl(2)-O(2) bond length is 2.15 Å. The Tl(2)-O(9) bond length is 2.20 Å. There is one shorter (2.37 Å) and one longer (2.38 Å) Tl(2)-O(4) bond length. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Ba(2), two equivalent Mg(1), and two equivalent Fe(1) atoms. In the second O site, O(2) is bonded in a 5-coordinate geometry to four equivalent Ba(2) and one Tl(2) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to two equivalent Ba(2), two equivalent Mg(1), and two equivalent Fe(1) atoms. In the fourth O site, O(4) is bonded in a distorted see-saw-like geometry to one Ba(2), one Tl(1), and two equivalent Tl(2) atoms. In the fifth O site, O(5) is bonded in a distorted see-saw-like geometry to one Mg(1), one Mg(2), and two equivalent Fe(3) atoms. In the sixth O site, O(6) is bonded to two equivalent Ba(1), two equivalent Mg(2), and two equivalent Fe(2) atoms to form a mixture of distorted corner and edge-sharing OBa2Mg2Fe2 octahedra. The corner-sharing octahedral tilt angles are 3°. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to four equivalent Ba(1), one Fe(2), and one Tl(1) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to two equivalent Ba(1), two equivalent Mg(2), and two equivalent Fe(2) atoms. In the ninth O site, O(9) is bonded in a distorted see-saw-like geometry to one Ba(1), one Tl(2), and two equivalent Tl(1) atoms. In the tenth O site, O(10) is bonded in a see-saw-like geometry to one Mg(1), one Mg(2), and two equivalent Fe(3) atoms.