Hf3GeO8 crystallizes in the tetragonal I-42m space group. There are two inequivalent Hf sites. In the first Hf site, Hf(1) is bonded in a distorted body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. In the second Hf site, Hf(2) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. Ge(1) is bonded in a tetrahedral geometry to four equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Hf(2) and two equivalent Hf(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Hf(2), two equivalent Hf(1), and one Ge(1) atom.
Hf3GeO8 crystallizes in the tetragonal I-42m space group. There are two inequivalent Hf sites. In the first Hf site, Hf(1) is bonded in a distorted body-centered cubic geometry to four equivalent O(1) and four equivalent O(2) atoms. All Hf(1)-O(1) bond lengths are 2.03 Å. All Hf(1)-O(2) bond lengths are 2.43 Å. In the second Hf site, Hf(2) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. All Hf(2)-O(1) bond lengths are 2.16 Å. All Hf(2)-O(2) bond lengths are 2.20 Å. Ge(1) is bonded in a tetrahedral geometry to four equivalent O(2) atoms. All Ge(1)-O(2) bond lengths are 1.78 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Hf(2) and two equivalent Hf(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Hf(2), two equivalent Hf(1), and one Ge(1) atom.