Hf3Ni4Ge4 crystallizes in the orthorhombic Immm space group. There are two inequivalent Hf sites. In the first Hf site, Hf(1) is bonded in a 12-coordinate geometry to six equivalent Ni(1), two equivalent Ge(1), and four equivalent Ge(2) atoms. In the second Hf site, Hf(2) is bonded to two equivalent Ge(1) and four equivalent Ge(2) atoms to form edge-sharing HfGe6 octahedra. Ni(1) is bonded in a 7-coordinate geometry to three equivalent Hf(1), one Ge(2), and three equivalent Ge(1) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to one Hf(2), two equivalent Hf(1), and six equivalent Ni(1) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to two equivalent Hf(2), four equivalent Hf(1), two equivalent Ni(1), and one Ge(2) atom.
Hf3Ni4Ge4 crystallizes in the orthorhombic Immm space group. There are two inequivalent Hf sites. In the first Hf site, Hf(1) is bonded in a 12-coordinate geometry to six equivalent Ni(1), two equivalent Ge(1), and four equivalent Ge(2) atoms. All Hf(1)-Ni(1) bond lengths are 2.81 Å. Both Hf(1)-Ge(1) bond lengths are 2.81 Å. All Hf(1)-Ge(2) bond lengths are 2.85 Å. In the second Hf site, Hf(2) is bonded to two equivalent Ge(1) and four equivalent Ge(2) atoms to form edge-sharing HfGe6 octahedra. Both Hf(2)-Ge(1) bond lengths are 2.73 Å. All Hf(2)-Ge(2) bond lengths are 2.74 Å. Ni(1) is bonded in a 7-coordinate geometry to three equivalent Hf(1), one Ge(2), and three equivalent Ge(1) atoms. The Ni(1)-Ge(2) bond length is 2.36 Å. There are two shorter (2.38 Å) and one longer (2.39 Å) Ni(1)-Ge(1) bond length. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to one Hf(2), two equivalent Hf(1), and six equivalent Ni(1) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to two equivalent Hf(2), four equivalent Hf(1), two equivalent Ni(1), and one Ge(2) atom. The Ge(2)-Ge(2) bond length is 2.59 Å.