BaTb2PdO5 crystallizes in the tetragonal P4/mbm space group. Ba(1) is bonded in a 10-coordinate geometry to two equivalent O(1) and eight equivalent O(2) atoms. Tb(1) is bonded in a 8-coordinate geometry to two equivalent O(1) and six equivalent O(2) atoms. Pd(1) is bonded in a square co-planar geometry to four equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1) and four equivalent Tb(1) atoms to form OBa2Tb4 octahedra that share corners with six equivalent O(1)Ba2Tb4 octahedra, corners with sixteen equivalent O(2)Ba2Tb3Pd octahedra, and faces with eight equivalent O(2)Ba2Tb3Pd octahedra. The corner-sharing octahedral tilt angles range from 0-59°. In the second O site, O(2) is bonded to two equivalent Ba(1), three equivalent Tb(1), and one Pd(1) atom to form distorted OBa2Tb3Pd octahedra that share corners with four equivalent O(1)Ba2Tb4 octahedra, corners with thirteen equivalent O(2)Ba2Tb3Pd octahedra, edges with five equivalent O(2)Ba2Tb3Pd octahedra, faces with two equivalent O(1)Ba2Tb4 octahedra, and faces with three equivalent O(2)Ba2Tb3Pd octahedra. The corner-sharing octahedral tilt angles range from 0-75°.
BaTb2PdO5 crystallizes in the tetragonal P4/mbm space group. Ba(1) is bonded in a 10-coordinate geometry to two equivalent O(1) and eight equivalent O(2) atoms. Both Ba(1)-O(1) bond lengths are 2.97 Å. All Ba(1)-O(2) bond lengths are 2.98 Å. Tb(1) is bonded in a 8-coordinate geometry to two equivalent O(1) and six equivalent O(2) atoms. Both Tb(1)-O(1) bond lengths are 2.44 Å. There are two shorter (2.25 Å) and four longer (2.53 Å) Tb(1)-O(2) bond lengths. Pd(1) is bonded in a square co-planar geometry to four equivalent O(2) atoms. All Pd(1)-O(2) bond lengths are 2.02 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1) and four equivalent Tb(1) atoms to form OBa2Tb4 octahedra that share corners with six equivalent O(1)Ba2Tb4 octahedra, corners with sixteen equivalent O(2)Ba2Tb3Pd octahedra, and faces with eight equivalent O(2)Ba2Tb3Pd octahedra. The corner-sharing octahedral tilt angles range from 0-59°. In the second O site, O(2) is bonded to two equivalent Ba(1), three equivalent Tb(1), and one Pd(1) atom to form distorted OBa2Tb3Pd octahedra that share corners with four equivalent O(1)Ba2Tb4 octahedra, corners with thirteen equivalent O(2)Ba2Tb3Pd octahedra, edges with five equivalent O(2)Ba2Tb3Pd octahedra, faces with two equivalent O(1)Ba2Tb4 octahedra, and faces with three equivalent O(2)Ba2Tb3Pd octahedra. The corner-sharing octahedral tilt angles range from 0-75°.