Yb2AlGe3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 10-coordinate geometry to three equivalent Al(1), two equivalent Ge(2), two equivalent Ge(3), and three equivalent Ge(1) atoms. In the second Yb site, Yb(2) is bonded in a 9-coordinate geometry to one Ge(1), four equivalent Ge(2), and four equivalent Ge(3) atoms. Al(1) is bonded to three equivalent Yb(1), one Ge(3), and three equivalent Ge(1) atoms to form distorted AlYb3Ge4 tetrahedra that share corners with seven equivalent Ge(1)Yb4Al3 pentagonal bipyramids,  an edgeedge with one Ge(1)Yb4Al3 pentagonal bipyramid, edges with two equivalent Al(1)Yb3Ge4 tetrahedra, and faces with two equivalent Al(1)Yb3Ge4 tetrahedra. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one Yb(2), three equivalent Yb(1), and three equivalent Al(1) atoms to form distorted GeYb4Al3 pentagonal bipyramids that share corners with seven equivalent Al(1)Yb3Ge4 tetrahedra, edges with six equivalent Ge(1)Yb4Al3 pentagonal bipyramids, and  an edgeedge with one Al(1)Yb3Ge4 tetrahedra. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to two equivalent Yb(1), four equivalent Yb(2), and two equivalent Ge(3) atoms. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to two equivalent Yb(1), four equivalent Yb(2), one Al(1), and two equivalent Ge(2) atoms.
Yb2AlGe3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 10-coordinate geometry to three equivalent Al(1), two equivalent Ge(2), two equivalent Ge(3), and three equivalent Ge(1) atoms. There is one shorter (3.29 Å) and two longer (3.35 Å) Yb(1)-Al(1) bond lengths. Both Yb(1)-Ge(2) bond lengths are 3.02 Å. Both Yb(1)-Ge(3) bond lengths are 3.23 Å. There is one shorter (3.00 Å) and two longer (3.02 Å) Yb(1)-Ge(1) bond lengths. In the second Yb site, Yb(2) is bonded in a 9-coordinate geometry to one Ge(1), four equivalent Ge(2), and four equivalent Ge(3) atoms. The Yb(2)-Ge(1) bond length is 3.01 Å. There are two shorter (3.03 Å) and two longer (3.16 Å) Yb(2)-Ge(2) bond lengths. There are two shorter (3.05 Å) and two longer (3.18 Å) Yb(2)-Ge(3) bond lengths. Al(1) is bonded to three equivalent Yb(1), one Ge(3), and three equivalent Ge(1) atoms to form distorted AlYb3Ge4 tetrahedra that share corners with seven equivalent Ge(1)Yb4Al3 pentagonal bipyramids,  an edgeedge with one Ge(1)Yb4Al3 pentagonal bipyramid, edges with two equivalent Al(1)Yb3Ge4 tetrahedra, and faces with two equivalent Al(1)Yb3Ge4 tetrahedra. The Al(1)-Ge(3) bond length is 2.58 Å. There are two shorter (2.54 Å) and one longer (2.58 Å) Al(1)-Ge(1) bond length. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one Yb(2), three equivalent Yb(1), and three equivalent Al(1) atoms to form distorted GeYb4Al3 pentagonal bipyramids that share corners with seven equivalent Al(1)Yb3Ge4 tetrahedra, edges with six equivalent Ge(1)Yb4Al3 pentagonal bipyramids, and  an edgeedge with one Al(1)Yb3Ge4 tetrahedra. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to two equivalent Yb(1), four equivalent Yb(2), and two equivalent Ge(3) atoms. Both Ge(2)-Ge(3) bond lengths are 2.46 Å. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to two equivalent Yb(1), four equivalent Yb(2), one Al(1), and two equivalent Ge(2) atoms.