Gd2Al3Ge4 crystallizes in the orthorhombic Cmce space group. Gd(1) is bonded in a 14-coordinate geometry to two equivalent Al(1), four equivalent Al(2), four equivalent Ge(1), and four equivalent Ge(2) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 6-coordinate geometry to four equivalent Gd(1), two equivalent Ge(2), and four equivalent Ge(1) atoms. In the second Al site, Al(2) is bonded in a 5-coordinate geometry to four equivalent Gd(1), one Ge(1), and four equivalent Ge(2) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to four equivalent Gd(1), one Al(2), two equivalent Al(1), and two equivalent Ge(1) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to four equivalent Gd(1), one Al(1), and four equivalent Al(2) atoms.
Gd2Al3Ge4 crystallizes in the orthorhombic Cmce space group. Gd(1) is bonded in a 14-coordinate geometry to two equivalent Al(1), four equivalent Al(2), four equivalent Ge(1), and four equivalent Ge(2) atoms. Both Gd(1)-Al(1) bond lengths are 3.47 Å. There are two shorter (3.20 Å) and two longer (3.40 Å) Gd(1)-Al(2) bond lengths. There are two shorter (3.16 Å) and two longer (3.18 Å) Gd(1)-Ge(1) bond lengths. There are a spread of Gd(1)-Ge(2) bond distances ranging from 3.12-3.19 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 6-coordinate geometry to four equivalent Gd(1), two equivalent Ge(2), and four equivalent Ge(1) atoms. Both Al(1)-Ge(2) bond lengths are 2.80 Å. All Al(1)-Ge(1) bond lengths are 2.58 Å. In the second Al site, Al(2) is bonded in a 5-coordinate geometry to four equivalent Gd(1), one Ge(1), and four equivalent Ge(2) atoms. The Al(2)-Ge(1) bond length is 2.55 Å. There are two shorter (2.61 Å) and two longer (2.86 Å) Al(2)-Ge(2) bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to four equivalent Gd(1), one Al(2), two equivalent Al(1), and two equivalent Ge(1) atoms. Both Ge(1)-Ge(1) bond lengths are 2.94 Å. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to four equivalent Gd(1), one Al(1), and four equivalent Al(2) atoms.