BaTm2O4 crystallizes in the orthorhombic Cmcm space group. Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. Tm(1) is bonded to one O(2), two equivalent O(1), and three equivalent O(3) atoms to form a mixture of corner and edge-sharing TmO6 octahedra. The corner-sharing octahedral tilt angles range from 0-41°. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1) and four equivalent Tm(1) atoms to form a mixture of distorted corner and edge-sharing OBa2Tm4 octahedra. The corner-sharing octahedral tilt angles are 47°. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Ba(1) and two equivalent Tm(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Ba(1) and three equivalent Tm(1) atoms.
BaTm2O4 crystallizes in the orthorhombic Cmcm space group. Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. Both Ba(1)-O(1) bond lengths are 3.11 Å. Both Ba(1)-O(2) bond lengths are 2.62 Å. All Ba(1)-O(3) bond lengths are 2.81 Å. Tm(1) is bonded to one O(2), two equivalent O(1), and three equivalent O(3) atoms to form a mixture of corner and edge-sharing TmO6 octahedra. The corner-sharing octahedral tilt angles range from 0-41°. The Tm(1)-O(2) bond length is 2.19 Å. Both Tm(1)-O(1) bond lengths are 2.42 Å. There are two shorter (2.23 Å) and one longer (2.27 Å) Tm(1)-O(3) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1) and four equivalent Tm(1) atoms to form a mixture of distorted corner and edge-sharing OBa2Tm4 octahedra. The corner-sharing octahedral tilt angles are 47°. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Ba(1) and two equivalent Tm(1) atoms. In the third O site, O(3) is bonded in a 5-coordinate geometry to two equivalent Ba(1) and three equivalent Tm(1) atoms.