Ba2Mn3Tl2O10 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 three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(10), two equivalent O(1), and two equivalent O(3) atoms to form MnO5 trigonal bipyramids that share corners with four equivalent Mn(1)O5 trigonal bipyramids and corners with two equivalent Mn(3)O4 trigonal pyramids. In the second Mn site, Mn(2) is bonded to one O(5), two equivalent O(6), and two equivalent O(8) atoms to form MnO5 trigonal bipyramids that share corners with four equivalent Mn(2)O5 trigonal bipyramids and corners with two equivalent Mn(3)O4 trigonal pyramids. In the third Mn site, Mn(3) is bonded to two equivalent O(10) and two equivalent O(5) atoms to form distorted MnO4 trigonal pyramids that share corners with two equivalent Mn(1)O5 trigonal bipyramids, corners with two equivalent Mn(2)O5 trigonal bipyramids, and corners with four equivalent Mn(3)O4 trigonal pyramids. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded in a 6-coordinate geometry to one O(4), one O(7), and four equivalent O(9) atoms. In the second Tl site, Tl(2) is bonded in a 6-coordinate geometry to one O(2), one O(9), and four equivalent O(4) atoms. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Ba(2) and two equivalent Mn(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 to two equivalent Ba(2) and two equivalent Mn(1) atoms to form distorted corner-sharing OBa2Mn2 trigonal pyramids. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Ba(2), one Tl(1), and four equivalent Tl(2) atoms. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mn(2) and two equivalent Mn(3) atoms. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to two equivalent Ba(1) and two equivalent Mn(2) atoms. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to four equivalent Ba(1) and one Tl(1) atom. In the eighth O site, O(8) is bonded to two equivalent Ba(1) and two equivalent Mn(2) atoms to form distorted corner-sharing OBa2Mn2 trigonal pyramids. In the ninth O site, O(9) is bonded in a 6-coordinate geometry to one Ba(1), one Tl(2), and four equivalent Tl(1) atoms. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Mn(1) and two equivalent Mn(3) atoms.
Ba2Mn3Tl2O10 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 3.29 Å. There is one shorter (2.74 Å) and one longer (2.75 Å) Ba(1)-O(6) bond length. There is one shorter (2.63 Å) and one longer (2.64 Å) Ba(1)-O(8) bond length. There are a spread of Ba(1)-O(7) bond distances ranging from 2.84-2.88 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 3.25 Å. There is one shorter (2.73 Å) and one longer (2.75 Å) Ba(2)-O(1) bond length. Both Ba(2)-O(3) bond lengths are 2.64 Å. There are a spread of Ba(2)-O(2) bond distances ranging from 2.82-2.87 Å. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(10), two equivalent O(1), and two equivalent O(3) atoms to form MnO5 trigonal bipyramids that share corners with four equivalent Mn(1)O5 trigonal bipyramids and corners with two equivalent Mn(3)O4 trigonal pyramids. The Mn(1)-O(10) bond length is 1.93 Å. There is one shorter (1.92 Å) and one longer (1.94 Å) Mn(1)-O(1) bond length. There is one shorter (1.95 Å) and one longer (1.98 Å) Mn(1)-O(3) bond length. In the second Mn site, Mn(2) is bonded to one O(5), two equivalent O(6), and two equivalent O(8) atoms to form MnO5 trigonal bipyramids that share corners with four equivalent Mn(2)O5 trigonal bipyramids and corners with two equivalent Mn(3)O4 trigonal pyramids. The Mn(2)-O(5) bond length is 1.94 Å. There is one shorter (1.92 Å) and one longer (1.94 Å) Mn(2)-O(6) bond length. There is one shorter (1.96 Å) and one longer (1.97 Å) Mn(2)-O(8) bond length. In the third Mn site, Mn(3) is bonded to two equivalent O(10) and two equivalent O(5) atoms to form distorted MnO4 trigonal pyramids that share corners with two equivalent Mn(1)O5 trigonal bipyramids, corners with two equivalent Mn(2)O5 trigonal bipyramids, and corners with four equivalent Mn(3)O4 trigonal pyramids. Both Mn(3)-O(10) bond lengths are 1.99 Å. There is one shorter (1.99 Å) and one longer (2.00 Å) Mn(3)-O(5) bond length. There are two inequivalent Tl sites. In the first Tl site, Tl(1) is bonded in a 6-coordinate geometry to one O(4), one O(7), and four equivalent O(9) atoms. The Tl(1)-O(4) bond length is 2.09 Å. The Tl(1)-O(7) bond length is 2.02 Å. There are a spread of Tl(1)-O(9) bond distances ranging from 2.61-2.78 Å. In the second Tl site, Tl(2) is bonded in a 6-coordinate geometry to one O(2), one O(9), and four equivalent O(4) atoms. The Tl(2)-O(2) bond length is 2.01 Å. The Tl(2)-O(9) bond length is 2.09 Å. There are a spread of Tl(2)-O(4) bond distances ranging from 2.59-2.80 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Ba(2) and two equivalent Mn(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 to two equivalent Ba(2) and two equivalent Mn(1) atoms to form distorted corner-sharing OBa2Mn2 trigonal pyramids. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Ba(2), one Tl(1), and four equivalent Tl(2) atoms. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mn(2) and two equivalent Mn(3) atoms. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to two equivalent Ba(1) and two equivalent Mn(2) atoms. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to four equivalent Ba(1) and one Tl(1) atom. In the eighth O site, O(8) is bonded to two equivalent Ba(1) and two equivalent Mn(2) atoms to form distorted corner-sharing OBa2Mn2 trigonal pyramids. In the ninth O site, O(9) is bonded in a 6-coordinate geometry to one Ba(1), one Tl(2), and four equivalent Tl(1) atoms. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Mn(1) and two equivalent Mn(3) atoms.