SmHfO14 crystallizes in the cubic Fd-3m space group. Sm(1) is bonded to four equivalent O(1) and twelve equivalent O(2) atoms to form SmO16 tetrahedra that share corners with four equivalent Sm(1)O16 tetrahedra and faces with four equivalent Hf(1)O12 cuboctahedra. Hf(1) is bonded to twelve equivalent O(2) atoms to form HfO12 cuboctahedra that share faces with four equivalent Sm(1)O16 tetrahedra. There are two inequivalent O sites. In the first O site, O(2) is bonded in a 6-coordinate geometry to one Sm(1), one Hf(1), and four equivalent O(2) atoms. In the second O site, O(1) is bonded in a linear geometry to two equivalent Sm(1) atoms.
SmHfO14 crystallizes in the cubic Fd-3m space group. Sm(1) is bonded to four equivalent O(1) and twelve equivalent O(2) atoms to form SmO16 tetrahedra that share corners with four equivalent Sm(1)O16 tetrahedra and faces with four equivalent Hf(1)O12 cuboctahedra. All Sm(1)-O(1) bond lengths are 2.32 Å. All Sm(1)-O(2) bond lengths are 2.89 Å. Hf(1) is bonded to twelve equivalent O(2) atoms to form HfO12 cuboctahedra that share faces with four equivalent Sm(1)O16 tetrahedra. All Hf(1)-O(2) bond lengths are 2.30 Å. There are two inequivalent O sites. In the first O site, O(2) is bonded in a 6-coordinate geometry to one Sm(1), one Hf(1), and four equivalent O(2) atoms. There are two shorter (1.88 Å) and two longer (1.99 Å) O(2)-O(2) bond lengths. In the second O site, O(1) is bonded in a linear geometry to two equivalent Sm(1) atoms.