La2Al2Ge crystallizes in the orthorhombic Cmcm space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to two equivalent Al(1) and five equivalent Ge(1) atoms. In the second La site, La(2) is bonded to four equivalent Al(1), six equivalent Al(2), and two equivalent Ge(1) atoms to form a mixture of edge and face-sharing LaAl10Ge2 cuboctahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 9-coordinate geometry to two equivalent La(1), four equivalent La(2), one Al(2), and two equivalent Ge(1) atoms. In the second Al site, Al(2) is bonded in a 9-coordinate geometry to six equivalent La(2), one Al(1), and two equivalent Al(2) atoms. Ge(1) is bonded in a 9-coordinate geometry to two equivalent La(2), five equivalent La(1), and two equivalent Al(1) atoms.
La2Al2Ge crystallizes in the orthorhombic Cmcm space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to two equivalent Al(1) and five equivalent Ge(1) atoms. Both La(1)-Al(1) bond lengths are 3.27 Å. There are four shorter (3.21 Å) and one longer (3.29 Å) La(1)-Ge(1) bond length. In the second La site, La(2) is bonded to four equivalent Al(1), six equivalent Al(2), and two equivalent Ge(1) atoms to form a mixture of edge and face-sharing LaAl10Ge2 cuboctahedra. All La(2)-Al(1) bond lengths are 3.32 Å. There are two shorter (3.38 Å) and four longer (3.39 Å) La(2)-Al(2) bond lengths. Both La(2)-Ge(1) bond lengths are 3.52 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 9-coordinate geometry to two equivalent La(1), four equivalent La(2), one Al(2), and two equivalent Ge(1) atoms. The Al(1)-Al(2) bond length is 2.58 Å. Both Al(1)-Ge(1) bond lengths are 2.56 Å. In the second Al site, Al(2) is bonded in a 9-coordinate geometry to six equivalent La(2), one Al(1), and two equivalent Al(2) atoms. Both Al(2)-Al(2) bond lengths are 2.62 Å. Ge(1) is bonded in a 9-coordinate geometry to two equivalent La(2), five equivalent La(1), and two equivalent Al(1) atoms.