BaTb2ZnO5 crystallizes in the orthorhombic Pnma space group. Ba(1) is bonded in a 11-coordinate geometry to three equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(3), and four equivalent O(2) atoms. In the second Tb site, Tb(2) is bonded to one O(1), two equivalent O(2), and four equivalent O(3) atoms to form distorted TbO7 pentagonal bipyramids that share corners with five equivalent Zn(1)O5 trigonal bipyramids, edges with two equivalent Tb(2)O7 pentagonal bipyramids, and  an edgeedge with one Zn(1)O5 trigonal bipyramid. Zn(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted ZnO5 trigonal bipyramids that share corners with five equivalent Tb(2)O7 pentagonal bipyramids and  an edgeedge with one Tb(2)O7 pentagonal bipyramid. There are three inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Ba(1), one Tb(1), one Tb(2), and one Zn(1) atom to form a mixture of distorted edge and corner-sharing OBa3Tb2Zn octahedra. The corner-sharing octahedral tilt angles are 1°. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Ba(1), one Tb(2), two equivalent Tb(1), and one Zn(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ba(1), one Tb(1), two equivalent Tb(2), and one Zn(1) atom.
BaTb2ZnO5 crystallizes in the orthorhombic Pnma space group. Ba(1) is bonded in a 11-coordinate geometry to three equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms. There is one shorter (2.74 Å) and two longer (2.89 Å) Ba(1)-O(1) bond lengths. There are two shorter (2.91 Å) and two longer (3.06 Å) Ba(1)-O(2) bond lengths. There are two shorter (3.14 Å) and two longer (3.34 Å) Ba(1)-O(3) bond lengths. There are two inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(3), and four equivalent O(2) atoms. The Tb(1)-O(1) bond length is 2.42 Å. Both Tb(1)-O(3) bond lengths are 2.32 Å. There are two shorter (2.37 Å) and two longer (2.40 Å) Tb(1)-O(2) bond lengths. In the second Tb site, Tb(2) is bonded to one O(1), two equivalent O(2), and four equivalent O(3) atoms to form distorted TbO7 pentagonal bipyramids that share corners with five equivalent Zn(1)O5 trigonal bipyramids, edges with two equivalent Tb(2)O7 pentagonal bipyramids, and  an edgeedge with one Zn(1)O5 trigonal bipyramid. The Tb(2)-O(1) bond length is 2.36 Å. Both Tb(2)-O(2) bond lengths are 2.39 Å. There are two shorter (2.33 Å) and two longer (2.38 Å) Tb(2)-O(3) bond lengths. Zn(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted ZnO5 trigonal bipyramids that share corners with five equivalent Tb(2)O7 pentagonal bipyramids and  an edgeedge with one Tb(2)O7 pentagonal bipyramid. The Zn(1)-O(1) bond length is 2.00 Å. Both Zn(1)-O(2) bond lengths are 2.16 Å. Both Zn(1)-O(3) bond lengths are 2.06 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Ba(1), one Tb(1), one Tb(2), and one Zn(1) atom to form a mixture of distorted edge and corner-sharing OBa3Tb2Zn octahedra. The corner-sharing octahedral tilt angles are 1°. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Ba(1), one Tb(2), two equivalent Tb(1), and one Zn(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ba(1), one Tb(1), two equivalent Tb(2), and one Zn(1) atom.