Tb11O20 crystallizes in the triclinic P-1 space group. There are six inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to one O(1), one O(4), one O(7), one O(8), one O(9), and two equivalent O(2) atoms to form a mixture of distorted edge and corner-sharing TbO7 pentagonal bipyramids. In the second Tb site, Tb(2) is bonded in a body-centered cubic geometry to one O(10), one O(3), one O(4), one O(7), one O(8), one O(9), and two equivalent O(6) atoms. In the third Tb site, Tb(3) is bonded in a 7-coordinate geometry to one O(3), one O(6), one O(8), two equivalent O(10), and two equivalent O(4) atoms. In the fourth Tb site, Tb(4) is bonded to one O(1), one O(10), one O(3), one O(5), one O(6), one O(8), and one O(9) atom to form a mixture of distorted edge and corner-sharing TbO7 hexagonal pyramids. In the fifth Tb site, Tb(5) is bonded to one O(2), one O(3), one O(7), two equivalent O(1), and two equivalent O(5) atoms to form a mixture of distorted edge and corner-sharing TbO7 hexagonal pyramids. In the sixth Tb site, Tb(6) is bonded in a body-centered cubic geometry to two equivalent O(2), two equivalent O(5), two equivalent O(7), and two equivalent O(9) atoms. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Tb(1), one Tb(4), and two equivalent Tb(5) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the second O site, O(2) is bonded to one Tb(5), one Tb(6), and two equivalent Tb(1) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the third O site, O(3) is bonded to one Tb(2), one Tb(3), one Tb(4), and one Tb(5) atom to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the fourth O site, O(4) is bonded to one Tb(1), one Tb(2), and two equivalent Tb(3) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the fifth O site, O(5) is bonded to one Tb(4), one Tb(6), and two equivalent Tb(5) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the sixth O site, O(6) is bonded to one Tb(3), one Tb(4), and two equivalent Tb(2) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the seventh O site, O(7) is bonded to one Tb(1), one Tb(2), one Tb(5), and one Tb(6) atom to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the eighth O site, O(8) is bonded to one Tb(1), one Tb(2), one Tb(3), and one Tb(4) atom to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the ninth O site, O(9) is bonded to one Tb(1), one Tb(2), one Tb(4), and one Tb(6) atom to form a mixture of distorted edge and corner-sharing OTb4 tetrahedra. In the tenth O site, O(10) is bonded to one Tb(2), one Tb(4), and two equivalent Tb(3) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra.
Tb11O20 crystallizes in the triclinic P-1 space group. There are six inequivalent Tb sites. In the first Tb site, Tb(1) is bonded to one O(1), one O(4), one O(7), one O(8), one O(9), and two equivalent O(2) atoms to form a mixture of distorted edge and corner-sharing TbO7 pentagonal bipyramids. The Tb(1)-O(1) bond length is 2.29 Å. The Tb(1)-O(4) bond length is 2.31 Å. The Tb(1)-O(7) bond length is 2.34 Å. The Tb(1)-O(8) bond length is 2.33 Å. The Tb(1)-O(9) bond length is 2.35 Å. There is one shorter (2.33 Å) and one longer (2.36 Å) Tb(1)-O(2) bond length. In the second Tb site, Tb(2) is bonded in a body-centered cubic geometry to one O(10), one O(3), one O(4), one O(7), one O(8), one O(9), and two equivalent O(6) atoms. The Tb(2)-O(10) bond length is 2.35 Å. The Tb(2)-O(3) bond length is 2.49 Å. The Tb(2)-O(4) bond length is 2.45 Å. The Tb(2)-O(7) bond length is 2.31 Å. The Tb(2)-O(8) bond length is 2.31 Å. The Tb(2)-O(9) bond length is 2.65 Å. There is one shorter (2.30 Å) and one longer (2.42 Å) Tb(2)-O(6) bond length. In the third Tb site, Tb(3) is bonded in a 7-coordinate geometry to one O(3), one O(6), one O(8), two equivalent O(10), and two equivalent O(4) atoms. The Tb(3)-O(3) bond length is 2.35 Å. The Tb(3)-O(6) bond length is 2.33 Å. The Tb(3)-O(8) bond length is 2.31 Å. There is one shorter (2.30 Å) and one longer (2.43 Å) Tb(3)-O(10) bond length. There is one shorter (2.35 Å) and one longer (2.36 Å) Tb(3)-O(4) bond length. In the fourth Tb site, Tb(4) is bonded to one O(1), one O(10), one O(3), one O(5), one O(6), one O(8), and one O(9) atom to form a mixture of distorted edge and corner-sharing TbO7 hexagonal pyramids. The Tb(4)-O(1) bond length is 2.33 Å. The Tb(4)-O(10) bond length is 2.33 Å. The Tb(4)-O(3) bond length is 2.36 Å. The Tb(4)-O(5) bond length is 2.31 Å. The Tb(4)-O(6) bond length is 2.30 Å. The Tb(4)-O(8) bond length is 2.33 Å. The Tb(4)-O(9) bond length is 2.36 Å. In the fifth Tb site, Tb(5) is bonded to one O(2), one O(3), one O(7), two equivalent O(1), and two equivalent O(5) atoms to form a mixture of distorted edge and corner-sharing TbO7 hexagonal pyramids. The Tb(5)-O(2) bond length is 2.31 Å. The Tb(5)-O(3) bond length is 2.37 Å. The Tb(5)-O(7) bond length is 2.33 Å. There is one shorter (2.29 Å) and one longer (2.37 Å) Tb(5)-O(1) bond length. There is one shorter (2.29 Å) and one longer (2.34 Å) Tb(5)-O(5) bond length. In the sixth Tb site, Tb(6) is bonded in a body-centered cubic geometry to two equivalent O(2), two equivalent O(5), two equivalent O(7), and two equivalent O(9) atoms. Both Tb(6)-O(2) bond lengths are 2.51 Å. Both Tb(6)-O(5) bond lengths are 2.31 Å. Both Tb(6)-O(7) bond lengths are 2.36 Å. Both Tb(6)-O(9) bond lengths are 2.42 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded to one Tb(1), one Tb(4), and two equivalent Tb(5) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the second O site, O(2) is bonded to one Tb(5), one Tb(6), and two equivalent Tb(1) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the third O site, O(3) is bonded to one Tb(2), one Tb(3), one Tb(4), and one Tb(5) atom to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the fourth O site, O(4) is bonded to one Tb(1), one Tb(2), and two equivalent Tb(3) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the fifth O site, O(5) is bonded to one Tb(4), one Tb(6), and two equivalent Tb(5) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the sixth O site, O(6) is bonded to one Tb(3), one Tb(4), and two equivalent Tb(2) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the seventh O site, O(7) is bonded to one Tb(1), one Tb(2), one Tb(5), and one Tb(6) atom to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the eighth O site, O(8) is bonded to one Tb(1), one Tb(2), one Tb(3), and one Tb(4) atom to form a mixture of edge and corner-sharing OTb4 tetrahedra. In the ninth O site, O(9) is bonded to one Tb(1), one Tb(2), one Tb(4), and one Tb(6) atom to form a mixture of distorted edge and corner-sharing OTb4 tetrahedra. In the tenth O site, O(10) is bonded to one Tb(2), one Tb(4), and two equivalent Tb(3) atoms to form a mixture of edge and corner-sharing OTb4 tetrahedra.