BaTb4SmO12 crystallizes in the orthorhombic Amm2 space group. Ba(1) is bonded in a 10-coordinate geometry to two equivalent O(3), four equivalent O(1), and four equivalent O(5) atoms. Tb(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form distorted corner-sharing TbO6 pentagonal pyramids. Sm(1) is bonded in a 6-coordinate geometry to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ba(1) and two equivalent Tb(1) atoms. In the second O site, O(2) is bonded in a trigonal planar geometry to two equivalent Tb(1) and one Sm(1) atom. In the third O site, O(3) is bonded in a square co-planar geometry to one Ba(1), two equivalent Tb(1), and one Sm(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Tb(1) and one Sm(1) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to two equivalent Ba(1) and two equivalent Tb(1) atoms.
BaTb4SmO12 crystallizes in the orthorhombic Amm2 space group. Ba(1) is bonded in a 10-coordinate geometry to two equivalent O(3), four equivalent O(1), and four equivalent O(5) atoms. Both Ba(1)-O(3) bond lengths are 2.96 Å. All Ba(1)-O(1) bond lengths are 2.66 Å. There are two shorter (3.03 Å) and two longer (3.23 Å) Ba(1)-O(5) bond lengths. Tb(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form distorted corner-sharing TbO6 pentagonal pyramids. The Tb(1)-O(2) bond length is 2.29 Å. The Tb(1)-O(3) bond length is 2.46 Å. The Tb(1)-O(4) bond length is 2.21 Å. The Tb(1)-O(5) bond length is 2.33 Å. There is one shorter (2.22 Å) and one longer (2.27 Å) Tb(1)-O(1) bond length. Sm(1) is bonded in a 6-coordinate geometry to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Both Sm(1)-O(2) bond lengths are 2.35 Å. Both Sm(1)-O(3) bond lengths are 2.54 Å. Both Sm(1)-O(4) bond lengths are 2.24 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ba(1) and two equivalent Tb(1) atoms. In the second O site, O(2) is bonded in a trigonal planar geometry to two equivalent Tb(1) and one Sm(1) atom. In the third O site, O(3) is bonded in a square co-planar geometry to one Ba(1), two equivalent Tb(1), and one Sm(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Tb(1) and one Sm(1) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to two equivalent Ba(1) and two equivalent Tb(1) atoms.