Ho2FeSbO7 crystallizes in the orthorhombic Imma space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(2), two equivalent O(4), and four equivalent O(3) atoms. In the second Ho site, Ho(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(4), and four equivalent O(3) atoms. Fe(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with four equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-54°. Sb(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form SbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra and corners with four equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-52°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ho(2) and two equivalent Fe(1) atoms to form distorted OHo2Fe2 tetrahedra that share corners with two equivalent O(4)Ho4 tetrahedra, corners with four equivalent O(1)Ho2Fe2 tetrahedra, corners with eight equivalent O(3)Ho2FeSb tetrahedra,  an edgeedge with one O(4)Ho4 tetrahedra, and edges with four equivalent O(3)Ho2FeSb tetrahedra. In the second O site, O(2) is bonded to two equivalent Ho(1) and two equivalent Sb(1) atoms to form distorted OHo2Sb2 tetrahedra that share corners with two equivalent O(4)Ho4 tetrahedra, corners with four equivalent O(2)Ho2Sb2 tetrahedra, corners with eight equivalent O(3)Ho2FeSb tetrahedra,  an edgeedge with one O(4)Ho4 tetrahedra, and edges with four equivalent O(3)Ho2FeSb tetrahedra. In the third O site, O(3) is bonded to one Ho(1), one Ho(2), one Fe(1), and one Sb(1) atom to form distorted OHo2FeSb tetrahedra that share corners with two equivalent O(1)Ho2Fe2 tetrahedra, corners with two equivalent O(2)Ho2Sb2 tetrahedra, corners with two equivalent O(4)Ho4 tetrahedra, corners with eight equivalent O(3)Ho2FeSb tetrahedra,  an edgeedge with one O(1)Ho2Fe2 tetrahedra,  an edgeedge with one O(2)Ho2Sb2 tetrahedra,  an edgeedge with one O(4)Ho4 tetrahedra, and edges with two equivalent O(3)Ho2FeSb tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Ho(1) and two equivalent Ho(2) atoms to form OHo4 tetrahedra that share corners with two equivalent O(1)Ho2Fe2 tetrahedra, corners with two equivalent O(2)Ho2Sb2 tetrahedra, corners with four equivalent O(4)Ho4 tetrahedra, corners with eight equivalent O(3)Ho2FeSb tetrahedra,  an edgeedge with one O(1)Ho2Fe2 tetrahedra,  an edgeedge with one O(2)Ho2Sb2 tetrahedra, and edges with four equivalent O(3)Ho2FeSb tetrahedra.
Ho2FeSbO7 crystallizes in the orthorhombic Imma space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(2), two equivalent O(4), and four equivalent O(3) atoms. Both Ho(1)-O(2) bond lengths are 2.49 Å. Both Ho(1)-O(4) bond lengths are 2.21 Å. All Ho(1)-O(3) bond lengths are 2.48 Å. In the second Ho site, Ho(2) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(4), and four equivalent O(3) atoms. Both Ho(2)-O(1) bond lengths are 2.47 Å. Both Ho(2)-O(4) bond lengths are 2.25 Å. All Ho(2)-O(3) bond lengths are 2.50 Å. Fe(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form FeO6 octahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with four equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-54°. Both Fe(1)-O(1) bond lengths are 2.03 Å. All Fe(1)-O(3) bond lengths are 2.06 Å. Sb(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form SbO6 octahedra that share corners with two equivalent Sb(1)O6 octahedra and corners with four equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-52°. Both Sb(1)-O(2) bond lengths are 2.03 Å. All Sb(1)-O(3) bond lengths are 1.99 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ho(2) and two equivalent Fe(1) atoms to form distorted OHo2Fe2 tetrahedra that share corners with two equivalent O(4)Ho4 tetrahedra, corners with four equivalent O(1)Ho2Fe2 tetrahedra, corners with eight equivalent O(3)Ho2FeSb tetrahedra,  an edgeedge with one O(4)Ho4 tetrahedra, and edges with four equivalent O(3)Ho2FeSb tetrahedra. In the second O site, O(2) is bonded to two equivalent Ho(1) and two equivalent Sb(1) atoms to form distorted OHo2Sb2 tetrahedra that share corners with two equivalent O(4)Ho4 tetrahedra, corners with four equivalent O(2)Ho2Sb2 tetrahedra, corners with eight equivalent O(3)Ho2FeSb tetrahedra,  an edgeedge with one O(4)Ho4 tetrahedra, and edges with four equivalent O(3)Ho2FeSb tetrahedra. In the third O site, O(3) is bonded to one Ho(1), one Ho(2), one Fe(1), and one Sb(1) atom to form distorted OHo2FeSb tetrahedra that share corners with two equivalent O(1)Ho2Fe2 tetrahedra, corners with two equivalent O(2)Ho2Sb2 tetrahedra, corners with two equivalent O(4)Ho4 tetrahedra, corners with eight equivalent O(3)Ho2FeSb tetrahedra,  an edgeedge with one O(1)Ho2Fe2 tetrahedra,  an edgeedge with one O(2)Ho2Sb2 tetrahedra,  an edgeedge with one O(4)Ho4 tetrahedra, and edges with two equivalent O(3)Ho2FeSb tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Ho(1) and two equivalent Ho(2) atoms to form OHo4 tetrahedra that share corners with two equivalent O(1)Ho2Fe2 tetrahedra, corners with two equivalent O(2)Ho2Sb2 tetrahedra, corners with four equivalent O(4)Ho4 tetrahedra, corners with eight equivalent O(3)Ho2FeSb tetrahedra,  an edgeedge with one O(1)Ho2Fe2 tetrahedra,  an edgeedge with one O(2)Ho2Sb2 tetrahedra, and edges with four equivalent O(3)Ho2FeSb tetrahedra.