Ho2AlGe3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 11-coordinate geometry to two equivalent Al(1), one Ge(1), four equivalent Ge(2), and four equivalent Ge(3) atoms. In the second Ho site, Ho(2) is bonded in a 7-coordinate geometry to two equivalent Ge(2), two equivalent Ge(3), and three equivalent Ge(1) atoms. Al(1) is bonded to two equivalent Ho(1), one Ge(3), and three equivalent Ge(1) atoms to form distorted AlHo2Ge4 tetrahedra that share corners with two equivalent Ge(1)Ho4Al3 pentagonal bipyramids and edges with four equivalent Al(1)Ho2Ge4 tetrahedra. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one Ho(1), three equivalent Ho(2), and three equivalent Al(1) atoms to form distorted GeHo4Al3 pentagonal bipyramids that share corners with two equivalent Al(1)Ho2Ge4 tetrahedra and edges with six equivalent Ge(1)Ho4Al3 pentagonal bipyramids. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to two equivalent Ho(2), four equivalent Ho(1), and two equivalent Ge(3) atoms. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to two equivalent Ho(2), four equivalent Ho(1), one Al(1), and two equivalent Ge(2) atoms.
Ho2AlGe3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 11-coordinate geometry to two equivalent Al(1), one Ge(1), four equivalent Ge(2), and four equivalent Ge(3) atoms. Both Ho(1)-Al(1) bond lengths are 3.32 Å. The Ho(1)-Ge(1) bond length is 3.03 Å. There are two shorter (2.97 Å) and two longer (3.33 Å) Ho(1)-Ge(2) bond lengths. There are two shorter (3.00 Å) and two longer (3.11 Å) Ho(1)-Ge(3) bond lengths. In the second Ho site, Ho(2) is bonded in a 7-coordinate geometry to two equivalent Ge(2), two equivalent Ge(3), and three equivalent Ge(1) atoms. Both Ho(2)-Ge(2) bond lengths are 2.94 Å. Both Ho(2)-Ge(3) bond lengths are 3.05 Å. There is one shorter (2.99 Å) and two longer (3.03 Å) Ho(2)-Ge(1) bond lengths. Al(1) is bonded to two equivalent Ho(1), one Ge(3), and three equivalent Ge(1) atoms to form distorted AlHo2Ge4 tetrahedra that share corners with two equivalent Ge(1)Ho4Al3 pentagonal bipyramids and edges with four equivalent Al(1)Ho2Ge4 tetrahedra. The Al(1)-Ge(3) bond length is 2.57 Å. There are two shorter (2.55 Å) and one longer (2.70 Å) Al(1)-Ge(1) bond length. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one Ho(1), three equivalent Ho(2), and three equivalent Al(1) atoms to form distorted GeHo4Al3 pentagonal bipyramids that share corners with two equivalent Al(1)Ho2Ge4 tetrahedra and edges with six equivalent Ge(1)Ho4Al3 pentagonal bipyramids. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to two equivalent Ho(2), four equivalent Ho(1), and two equivalent Ge(3) atoms. There is one shorter (2.58 Å) and one longer (2.67 Å) Ge(2)-Ge(3) bond length. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to two equivalent Ho(2), four equivalent Ho(1), one Al(1), and two equivalent Ge(2) atoms.