BaTm2ZnO5 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 Tm sites. In the first Tm site, Tm(1) is bonded to one O(1), two equivalent O(2), and four equivalent O(3) atoms to form distorted TmO7 pentagonal bipyramids that share corners with five equivalent Zn(1)O5 trigonal bipyramids, edges with two equivalent Tm(1)O7 pentagonal bipyramids, and  an edgeedge with one Zn(1)O5 trigonal bipyramid. In the second Tm site, Tm(2) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(3), and four equivalent O(2) atoms. 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 Tm(1)O7 pentagonal bipyramids and  an edgeedge with one Tm(1)O7 pentagonal bipyramid. There are three inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Ba(1), one Tm(1), one Tm(2), and one Zn(1) atom to form distorted OBa3Tm2Zn octahedra that share corners with two equivalent O(1)Ba3Tm2Zn octahedra, corners with eight equivalent O(2)Ba2Tm3Zn octahedra, edges with two equivalent O(1)Ba3Tm2Zn octahedra, and faces with four equivalent O(2)Ba2Tm3Zn octahedra. The corner-sharing octahedral tilt angles range from 0-64°. In the second O site, O(2) is bonded to two equivalent Ba(1), one Tm(1), two equivalent Tm(2), and one Zn(1) atom to form distorted OBa2Tm3Zn octahedra that share corners with four equivalent O(2)Ba2Tm3Zn octahedra, corners with four equivalent O(1)Ba3Tm2Zn octahedra, edges with two equivalent O(2)Ba2Tm3Zn octahedra, faces with two equivalent O(2)Ba2Tm3Zn octahedra, and faces with two equivalent O(1)Ba3Tm2Zn octahedra. The corner-sharing octahedral tilt angles range from 25-77°. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ba(1), one Tm(2), two equivalent Tm(1), and one Zn(1) atom.
BaTm2ZnO5 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 (2.85 Å) Ba(1)-O(1) bond lengths. There are two shorter (2.89 Å) and two longer (2.99 Å) Ba(1)-O(2) bond lengths. There are two shorter (3.12 Å) and two longer (3.30 Å) Ba(1)-O(3) bond lengths. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded to one O(1), two equivalent O(2), and four equivalent O(3) atoms to form distorted TmO7 pentagonal bipyramids that share corners with five equivalent Zn(1)O5 trigonal bipyramids, edges with two equivalent Tm(1)O7 pentagonal bipyramids, and  an edgeedge with one Zn(1)O5 trigonal bipyramid. The Tm(1)-O(1) bond length is 2.29 Å. Both Tm(1)-O(2) bond lengths are 2.35 Å. There are two shorter (2.28 Å) and two longer (2.33 Å) Tm(1)-O(3) bond lengths. In the second Tm site, Tm(2) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(3), and four equivalent O(2) atoms. The Tm(2)-O(1) bond length is 2.36 Å. Both Tm(2)-O(3) bond lengths are 2.27 Å. There are two shorter (2.33 Å) and two longer (2.37 Å) Tm(2)-O(2) 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 Tm(1)O7 pentagonal bipyramids and  an edgeedge with one Tm(1)O7 pentagonal bipyramid. The Zn(1)-O(1) bond length is 2.00 Å. Both Zn(1)-O(2) bond lengths are 2.14 Å. Both Zn(1)-O(3) bond lengths are 2.05 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Ba(1), one Tm(1), one Tm(2), and one Zn(1) atom to form distorted OBa3Tm2Zn octahedra that share corners with two equivalent O(1)Ba3Tm2Zn octahedra, corners with eight equivalent O(2)Ba2Tm3Zn octahedra, edges with two equivalent O(1)Ba3Tm2Zn octahedra, and faces with four equivalent O(2)Ba2Tm3Zn octahedra. The corner-sharing octahedral tilt angles range from 0-64°. In the second O site, O(2) is bonded to two equivalent Ba(1), one Tm(1), two equivalent Tm(2), and one Zn(1) atom to form distorted OBa2Tm3Zn octahedra that share corners with four equivalent O(2)Ba2Tm3Zn octahedra, corners with four equivalent O(1)Ba3Tm2Zn octahedra, edges with two equivalent O(2)Ba2Tm3Zn octahedra, faces with two equivalent O(2)Ba2Tm3Zn octahedra, and faces with two equivalent O(1)Ba3Tm2Zn octahedra. The corner-sharing octahedral tilt angles range from 25-77°. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ba(1), one Tm(2), two equivalent Tm(1), and one Zn(1) atom.