The structure described by Ho2ScNbO7 crystallizes in the orthorhombic Imma space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded to two equivalent O(3), two equivalent O(4), and four equivalent O(1) atoms to form distorted HoO8 hexagonal bipyramids that share edges with two equivalent Ho(1)O8 hexagonal bipyramids, edges with two equivalent Sc(1)O6 octahedra, and edges with four equivalent Nb(1)O6 octahedra. In the second Ho site, Ho(2) is bonded in a body-centered cubic geometry to two equivalent O(2), two equivalent O(4), and four equivalent O(1) atoms. Sc(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form ScO6 octahedra that share corners with two equivalent Sc(1)O6 octahedra, corners with four equivalent Nb(1)O6 octahedra, and edges with two equivalent Ho(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 53-60°. Nb(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form NbO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with four equivalent Sc(1)O6 octahedra, and edges with four equivalent Ho(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 46-53°. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Ho(1), one Ho(2), one Sc(1), and one Nb(1) atom to form distorted OHo2ScNb tetrahedra that share corners with two equivalent O(2)Ho2Sc2 tetrahedra, corners with two equivalent O(4)Ho4 tetrahedra, corners with eight equivalent O(1)Ho2ScNb tetrahedra,  an edgeedge with one O(2)Ho2Sc2 tetrahedra,  an edgeedge with one O(4)Ho4 tetrahedra, and edges with two equivalent O(1)Ho2ScNb tetrahedra. In the second O site, O(2) is bonded to two equivalent Ho(2) and two equivalent Sc(1) atoms to form OHo2Sc2 tetrahedra that share corners with two equivalent O(4)Ho4 tetrahedra, corners with four equivalent O(2)Ho2Sc2 tetrahedra, corners with eight equivalent O(1)Ho2ScNb tetrahedra,  an edgeedge with one O(4)Ho4 tetrahedra, and edges with four equivalent O(1)Ho2ScNb tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ho(1) and two equivalent Nb(1) atoms. 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(2)Ho2Sc2 tetrahedra, corners with four equivalent O(4)Ho4 tetrahedra, corners with eight equivalent O(1)Ho2ScNb tetrahedra,  an edgeedge with one O(2)Ho2Sc2 tetrahedra, and edges with four equivalent O(1)Ho2ScNb tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ho2ScNbO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.355
_cell_length_b   7.355
_cell_length_c   7.355
_cell_angle_alpha   120.762
_cell_angle_beta   119.372
_cell_angle_gamma   89.889
_symmetry_Int_Tables_number   1
_cell_volume   281.009
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Ho  Ho0  1  0.500  0.500  0.500  1.0
  Ho  Ho1  1  0.500  0.000  0.000  1.0
  Ho  Ho2  1  0.500  0.500  0.000  1.0
  Ho  Ho3  1  0.000  0.500  0.500  1.0
  Sc  Sc4  1  0.000  0.000  0.500  1.0
  Sc  Sc5  1  0.000  0.500  0.000  1.0
  Nb  Nb6  1  0.000  0.000  0.000  1.0
  Nb  Nb7  1  0.500  0.000  0.500  1.0
  O  O8  1  0.345  0.079  0.675  1.0
  O  O9  1  0.904  0.079  0.234  1.0
  O  O10  1  0.898  0.648  0.250  1.0
  O  O11  1  0.904  0.670  0.825  1.0
  O  O12  1  0.345  0.670  0.266  1.0
  O  O13  1  0.326  0.076  0.250  1.0
  O  O14  1  0.655  0.921  0.325  1.0
  O  O15  1  0.096  0.921  0.766  1.0
  O  O16  1  0.102  0.352  0.750  1.0
  O  O17  1  0.096  0.330  0.175  1.0
  O  O18  1  0.655  0.330  0.734  1.0
  O  O19  1  0.674  0.924  0.750  1.0
  O  O20  1  0.621  0.371  0.250  1.0
  O  O21  1  0.379  0.629  0.750  1.0
[/CIF]
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The structure described by Ho2ScNbO7 crystallizes in the orthorhombic Imma space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded to two equivalent O(3), two equivalent O(4), and four equivalent O(1) atoms to form distorted HoO8 hexagonal bipyramids that share edges with two equivalent Ho(1)O8 hexagonal bipyramids, edges with two equivalent Sc(1)O6 octahedra, and edges with four equivalent Nb(1)O6 octahedra. In the second Ho site, Ho(2) is bonded in a body-centered cubic geometry to two equivalent O(2), two equivalent O(4), and four equivalent O(1) atoms. Sc(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form ScO6 octahedra that share corners with two equivalent Sc(1)O6 octahedra, corners with four equivalent Nb(1)O6 octahedra, and edges with two equivalent Ho(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 53-60°. Nb(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form NbO6 octahedra that share corners with two equivalent Nb(1)O6 octahedra, corners with four equivalent Sc(1)O6 octahedra, and edges with four equivalent Ho(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles range from 46-53°. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Ho(1), one Ho(2), one Sc(1), and one Nb(1) atom to form distorted OHo2ScNb tetrahedra that share corners with two equivalent O(2)Ho2Sc2 tetrahedra, corners with two equivalent O(4)Ho4 tetrahedra, corners with eight equivalent O(1)Ho2ScNb tetrahedra,  an edgeedge with one O(2)Ho2Sc2 tetrahedra,  an edgeedge with one O(4)Ho4 tetrahedra, and edges with two equivalent O(1)Ho2ScNb tetrahedra. In the second O site, O(2) is bonded to two equivalent Ho(2) and two equivalent Sc(1) atoms to form OHo2Sc2 tetrahedra that share corners with two equivalent O(4)Ho4 tetrahedra, corners with four equivalent O(2)Ho2Sc2 tetrahedra, corners with eight equivalent O(1)Ho2ScNb tetrahedra,  an edgeedge with one O(4)Ho4 tetrahedra, and edges with four equivalent O(1)Ho2ScNb tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Ho(1) and two equivalent Nb(1) atoms. 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(2)Ho2Sc2 tetrahedra, corners with four equivalent O(4)Ho4 tetrahedra, corners with eight equivalent O(1)Ho2ScNb tetrahedra,  an edgeedge with one O(2)Ho2Sc2 tetrahedra, and edges with four equivalent O(1)Ho2ScNb tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ho2ScNbO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.355
_cell_length_b   7.355
_cell_length_c   7.355
_cell_angle_alpha   120.762
_cell_angle_beta   119.372
_cell_angle_gamma   89.889
_symmetry_Int_Tables_number   1
_cell_volume   281.009
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Ho  Ho0  1  0.500  0.500  0.500  1.0
  Ho  Ho1  1  0.500  0.000  0.000  1.0
  Ho  Ho2  1  0.500  0.500  0.000  1.0
  Ho  Ho3  1  0.000  0.500  0.500  1.0
  Sc  Sc4  1  0.000  0.000  0.500  1.0
  Sc  Sc5  1  0.000  0.500  0.000  1.0
  Nb  Nb6  1  0.000  0.000  0.000  1.0
  Nb  Nb7  1  0.500  0.000  0.500  1.0
  O  O8  1  0.345  0.079  0.675  1.0
  O  O9  1  0.904  0.079  0.234  1.0
  O  O10  1  0.898  0.648  0.250  1.0
  O  O11  1  0.904  0.670  0.825  1.0
  O  O12  1  0.345  0.670  0.266  1.0
  O  O13  1  0.326  0.076  0.250  1.0
  O  O14  1  0.655  0.921  0.325  1.0
  O  O15  1  0.096  0.921  0.766  1.0
  O  O16  1  0.102  0.352  0.750  1.0
  O  O17  1  0.096  0.330  0.175  1.0
  O  O18  1  0.655  0.330  0.734  1.0
  O  O19  1  0.674  0.924  0.750  1.0
  O  O20  1  0.621  0.371  0.250  1.0
  O  O21  1  0.379  0.629  0.750  1.0
[/CIF]
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