TbEu2NbO6 is Orthorhombic Perovskite-derived structured and crystallizes in the cubic Pn-3 space group. Tb(1) is bonded to six equivalent O(1) atoms to form TbO6 octahedra that share corners with six equivalent Nb(1)O6 octahedra and faces with two equivalent Eu(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 26°. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to twelve equivalent O(1) atoms to form EuO12 cuboctahedra that share faces with four equivalent Tb(1)O6 octahedra and faces with four equivalent Nb(1)O6 octahedra. In the second Eu site, Eu(2) is bonded in a distorted square co-planar geometry to eight equivalent O(1) atoms. Nb(1) is bonded to six equivalent O(1) atoms to form NbO6 octahedra that share corners with six equivalent Tb(1)O6 octahedra and faces with two equivalent Eu(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 26°. O(1) is bonded in a 3-coordinate geometry to one Tb(1), one Eu(1), two equivalent Eu(2), and one Nb(1) atom.
TbEu2NbO6 is Orthorhombic Perovskite-derived structured and crystallizes in the cubic Pn-3 space group. Tb(1) is bonded to six equivalent O(1) atoms to form TbO6 octahedra that share corners with six equivalent Nb(1)O6 octahedra and faces with two equivalent Eu(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 26°. All Tb(1)-O(1) bond lengths are 2.25 Å. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to twelve equivalent O(1) atoms to form EuO12 cuboctahedra that share faces with four equivalent Tb(1)O6 octahedra and faces with four equivalent Nb(1)O6 octahedra. All Eu(1)-O(1) bond lengths are 2.95 Å. In the second Eu site, Eu(2) is bonded in a distorted square co-planar geometry to eight equivalent O(1) atoms. There are four shorter (2.48 Å) and four longer (3.03 Å) Eu(2)-O(1) bond lengths. Nb(1) is bonded to six equivalent O(1) atoms to form NbO6 octahedra that share corners with six equivalent Tb(1)O6 octahedra and faces with two equivalent Eu(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles are 26°. All Nb(1)-O(1) bond lengths are 2.03 Å. O(1) is bonded in a 3-coordinate geometry to one Tb(1), one Eu(1), two equivalent Eu(2), and one Nb(1) atom.