Ho5NiSb2 crystallizes in the orthorhombic Pnma space group. There are four inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 5-coordinate geometry to two equivalent Ni(1) and three equivalent Sb(1) atoms. In the second Ho site, Ho(2) is bonded to one Ni(1) and four equivalent Sb(1) atoms to form a mixture of distorted corner and edge-sharing HoNiSb4 trigonal bipyramids. In the third Ho site, Ho(3) is bonded to one Ni(1) and four equivalent Sb(1) atoms to form a mixture of distorted corner, face, and edge-sharing HoNiSb4 trigonal bipyramids. In the fourth Ho site, Ho(4) is bonded to one Ni(1) and four equivalent Sb(1) atoms to form a mixture of distorted corner, face, and edge-sharing HoNiSb4 trigonal bipyramids. Ni(1) is bonded to one Ho(2), one Ho(3), one Ho(4), and four equivalent Ho(1) atoms to form distorted edge-sharing NiHo7 pentagonal bipyramids. Sb(1) is bonded in a 9-coordinate geometry to two equivalent Ho(2), two equivalent Ho(3), two equivalent Ho(4), and three equivalent Ho(1) atoms.
Ho5NiSb2 crystallizes in the orthorhombic Pnma space group. There are four inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 5-coordinate geometry to two equivalent Ni(1) and three equivalent Sb(1) atoms. There is one shorter (2.72 Å) and one longer (2.88 Å) Ho(1)-Ni(1) bond length. There are a spread of Ho(1)-Sb(1) bond distances ranging from 3.27-3.54 Å. In the second Ho site, Ho(2) is bonded to one Ni(1) and four equivalent Sb(1) atoms to form a mixture of distorted corner and edge-sharing HoNiSb4 trigonal bipyramids. The Ho(2)-Ni(1) bond length is 2.71 Å. There are two shorter (3.17 Å) and two longer (3.21 Å) Ho(2)-Sb(1) bond lengths. In the third Ho site, Ho(3) is bonded to one Ni(1) and four equivalent Sb(1) atoms to form a mixture of distorted corner, face, and edge-sharing HoNiSb4 trigonal bipyramids. The Ho(3)-Ni(1) bond length is 2.69 Å. There are two shorter (3.13 Å) and two longer (3.14 Å) Ho(3)-Sb(1) bond lengths. In the fourth Ho site, Ho(4) is bonded to one Ni(1) and four equivalent Sb(1) atoms to form a mixture of distorted corner, face, and edge-sharing HoNiSb4 trigonal bipyramids. The Ho(4)-Ni(1) bond length is 3.02 Å. There are two shorter (3.08 Å) and two longer (3.09 Å) Ho(4)-Sb(1) bond lengths. Ni(1) is bonded to one Ho(2), one Ho(3), one Ho(4), and four equivalent Ho(1) atoms to form distorted edge-sharing NiHo7 pentagonal bipyramids. Sb(1) is bonded in a 9-coordinate geometry to two equivalent Ho(2), two equivalent Ho(3), two equivalent Ho(4), and three equivalent Ho(1) atoms.