Y2AlGe3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 11-coordinate geometry to two equivalent Al(1), one Ge(3), four equivalent Ge(1), and four equivalent Ge(2) atoms. In the second Y site, Y(2) is bonded in a 7-coordinate geometry to two equivalent Ge(1), two equivalent Ge(2), and three equivalent Ge(3) atoms. Al(1) is bonded to two equivalent Y(1), one Ge(2), and three equivalent Ge(3) atoms to form distorted edge-sharing AlY2Ge4 tetrahedra. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 8-coordinate geometry to two equivalent Y(2), four equivalent Y(1), and two equivalent Ge(2) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to two equivalent Y(2), four equivalent Y(1), one Al(1), and two equivalent Ge(1) atoms. In the third Ge site, Ge(3) is bonded in a 7-coordinate geometry to one Y(1), three equivalent Y(2), and three equivalent Al(1) atoms.
Y2AlGe3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 11-coordinate geometry to two equivalent Al(1), one Ge(3), four equivalent Ge(1), and four equivalent Ge(2) atoms. Both Y(1)-Al(1) bond lengths are 3.35 Å. The Y(1)-Ge(3) bond length is 3.06 Å. There are two shorter (2.97 Å) and two longer (3.34 Å) Y(1)-Ge(1) bond lengths. There are two shorter (3.01 Å) and two longer (3.13 Å) Y(1)-Ge(2) bond lengths. In the second Y site, Y(2) is bonded in a 7-coordinate geometry to two equivalent Ge(1), two equivalent Ge(2), and three equivalent Ge(3) atoms. Both Y(2)-Ge(1) bond lengths are 2.97 Å. Both Y(2)-Ge(2) bond lengths are 3.06 Å. There is one shorter (3.01 Å) and two longer (3.04 Å) Y(2)-Ge(3) bond lengths. Al(1) is bonded to two equivalent Y(1), one Ge(2), and three equivalent Ge(3) atoms to form distorted edge-sharing AlY2Ge4 tetrahedra. The Al(1)-Ge(2) bond length is 2.57 Å. There are two shorter (2.57 Å) and one longer (2.70 Å) Al(1)-Ge(3) bond length. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 8-coordinate geometry to two equivalent Y(2), four equivalent Y(1), and two equivalent Ge(2) atoms. There is one shorter (2.58 Å) and one longer (2.69 Å) Ge(1)-Ge(2) bond length. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to two equivalent Y(2), four equivalent Y(1), one Al(1), and two equivalent Ge(1) atoms. In the third Ge site, Ge(3) is bonded in a 7-coordinate geometry to one Y(1), three equivalent Y(2), and three equivalent Al(1) atoms.