The material structure described by Ho2Cu(WO4)4 crystallizes in the monoclinic C2/c space group. Ho(1) is bonded to one O(1), one O(3), one O(5), one O(6), one O(8), and two equivalent O(2) atoms to form distorted HoO7 pentagonal bipyramids that share corners with three equivalent W(1)O6 octahedra, corners with four equivalent W(2)O6 octahedra,  an edgeedge with one W(1)O6 octahedra,  an edgeedge with one Cu(1)O6 octahedra, and  an edgeedge with one Ho(1)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 30-58°. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(8), and two equivalent O(7) atoms to form distorted WO6 octahedra that share  a cornercorner with one Cu(1)O6 octahedra, corners with two equivalent W(1)O6 octahedra, corners with three equivalent Ho(1)O7 pentagonal bipyramids,  an edgeedge with one W(2)O6 octahedra, and  an edgeedge with one Ho(1)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 12-54°. In the second W site, W(2) is bonded to one O(1), one O(5), one O(6), one O(8), and two equivalent O(4) atoms to form distorted WO6 octahedra that share corners with three equivalent Cu(1)O6 octahedra, corners with four equivalent Ho(1)O7 pentagonal bipyramids,  an edgeedge with one W(1)O6 octahedra, and  an edgeedge with one W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-54°. Cu(1) is bonded to two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms to form CuO6 octahedra that share corners with two equivalent W(1)O6 octahedra, corners with six equivalent W(2)O6 octahedra, and edges with two equivalent Ho(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 51-54°. There are eight inequivalent O sites. In the first O site, O(2) is bonded in a trigonal non-coplanar geometry to two equivalent Ho(1) and one W(1) atom. In the second O site, O(3) is bonded in a distorted trigonal planar geometry to one Ho(1), one W(1), and one Cu(1) atom. In the third O site, O(4) is bonded in a trigonal planar geometry to two equivalent W(2) and one Cu(1) atom. In the fourth O site, O(5) is bonded in a bent 150 degrees geometry to one Ho(1) and one W(2) atom. In the fifth O site, O(6) is bonded in a distorted trigonal planar geometry to one Ho(1), one W(2), and one Cu(1) atom. In the sixth O site, O(7) is bonded in a distorted linear geometry to two equivalent W(1) atoms. In the seventh O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Ho(1), one W(1), and one W(2) atom. In the eighth O site, O(1) is bonded in a trigonal planar geometry to one Ho(1), one W(1), and one W(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ho2Cu(WO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.126
_cell_length_b   10.126
_cell_length_c   11.294
_cell_angle_alpha   70.325
_cell_angle_beta   70.325
_cell_angle_gamma   32.402
_symmetry_Int_Tables_number   1
_cell_volume   581.125
_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  0.481  0.818  0.044  1.0
  Ho  Ho1  1  0.519  0.182  0.956  1.0
  Ho  Ho2  1  0.182  0.519  0.456  1.0
  Ho  Ho3  1  0.818  0.481  0.544  1.0
  Cu  Cu4  1  0.653  0.347  0.250  1.0
  Cu  Cu5  1  0.347  0.653  0.750  1.0
  W  W6  1  0.689  0.935  0.286  1.0
  W  W7  1  0.311  0.065  0.714  1.0
  W  W8  1  0.065  0.311  0.214  1.0
  W  W9  1  0.935  0.689  0.786  1.0
  W  W10  1  0.756  0.132  0.592  1.0
  W  W11  1  0.244  0.868  0.408  1.0
  W  W12  1  0.868  0.244  0.908  1.0
  W  W13  1  0.132  0.756  0.092  1.0
  O  O14  1  0.778  0.960  0.102  1.0
  O  O15  1  0.222  0.040  0.898  1.0
  O  O16  1  0.040  0.222  0.398  1.0
  O  O17  1  0.960  0.778  0.602  1.0
  O  O18  1  0.257  0.209  0.054  1.0
  O  O19  1  0.743  0.791  0.946  1.0
  O  O20  1  0.791  0.743  0.446  1.0
  O  O21  1  0.209  0.257  0.554  1.0
  O  O22  1  0.528  0.214  0.325  1.0
  O  O23  1  0.472  0.786  0.675  1.0
  O  O24  1  0.786  0.472  0.175  1.0
  O  O25  1  0.214  0.528  0.825  1.0
  O  O26  1  0.873  0.105  0.411  1.0
  O  O27  1  0.127  0.895  0.589  1.0
  O  O28  1  0.895  0.127  0.089  1.0
  O  O29  1  0.105  0.873  0.911  1.0
  O  O30  1  0.523  0.715  0.426  1.0
  O  O31  1  0.477  0.285  0.574  1.0
  O  O32  1  0.285  0.477  0.074  1.0
  O  O33  1  0.715  0.523  0.926  1.0
  O  O34  1  0.394  0.633  0.121  1.0
  O  O35  1  0.606  0.367  0.879  1.0
  O  O36  1  0.367  0.606  0.379  1.0
  O  O37  1  0.633  0.394  0.621  1.0
  O  O38  1  0.415  0.077  0.264  1.0
  O  O39  1  0.585  0.923  0.736  1.0
  O  O40  1  0.923  0.585  0.236  1.0
  O  O41  1  0.077  0.415  0.764  1.0
  O  O42  1  0.240  0.975  0.228  1.0
  O  O43  1  0.760  0.025  0.772  1.0
  O  O44  1  0.025  0.760  0.272  1.0
  O  O45  1  0.975  0.240  0.728  1.0
[/CIF]
.
The material structure described by Ho2Cu(WO4)4 crystallizes in the monoclinic C2/c space group. Ho(1) is bonded to one O(1), one O(3), one O(5), one O(6), one O(8), and two equivalent O(2) atoms to form distorted HoO7 pentagonal bipyramids that share corners with three equivalent W(1)O6 octahedra, corners with four equivalent W(2)O6 octahedra,  an edgeedge with one W(1)O6 octahedra,  an edgeedge with one Cu(1)O6 octahedra, and  an edgeedge with one Ho(1)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 30-58°. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(8), and two equivalent O(7) atoms to form distorted WO6 octahedra that share  a cornercorner with one Cu(1)O6 octahedra, corners with two equivalent W(1)O6 octahedra, corners with three equivalent Ho(1)O7 pentagonal bipyramids,  an edgeedge with one W(2)O6 octahedra, and  an edgeedge with one Ho(1)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 12-54°. In the second W site, W(2) is bonded to one O(1), one O(5), one O(6), one O(8), and two equivalent O(4) atoms to form distorted WO6 octahedra that share corners with three equivalent Cu(1)O6 octahedra, corners with four equivalent Ho(1)O7 pentagonal bipyramids,  an edgeedge with one W(1)O6 octahedra, and  an edgeedge with one W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-54°. Cu(1) is bonded to two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms to form CuO6 octahedra that share corners with two equivalent W(1)O6 octahedra, corners with six equivalent W(2)O6 octahedra, and edges with two equivalent Ho(1)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles range from 51-54°. There are eight inequivalent O sites. In the first O site, O(2) is bonded in a trigonal non-coplanar geometry to two equivalent Ho(1) and one W(1) atom. In the second O site, O(3) is bonded in a distorted trigonal planar geometry to one Ho(1), one W(1), and one Cu(1) atom. In the third O site, O(4) is bonded in a trigonal planar geometry to two equivalent W(2) and one Cu(1) atom. In the fourth O site, O(5) is bonded in a bent 150 degrees geometry to one Ho(1) and one W(2) atom. In the fifth O site, O(6) is bonded in a distorted trigonal planar geometry to one Ho(1), one W(2), and one Cu(1) atom. In the sixth O site, O(7) is bonded in a distorted linear geometry to two equivalent W(1) atoms. In the seventh O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Ho(1), one W(1), and one W(2) atom. In the eighth O site, O(1) is bonded in a trigonal planar geometry to one Ho(1), one W(1), and one W(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ho2Cu(WO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.126
_cell_length_b   10.126
_cell_length_c   11.294
_cell_angle_alpha   70.325
_cell_angle_beta   70.325
_cell_angle_gamma   32.402
_symmetry_Int_Tables_number   1
_cell_volume   581.125
_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  0.481  0.818  0.044  1.0
  Ho  Ho1  1  0.519  0.182  0.956  1.0
  Ho  Ho2  1  0.182  0.519  0.456  1.0
  Ho  Ho3  1  0.818  0.481  0.544  1.0
  Cu  Cu4  1  0.653  0.347  0.250  1.0
  Cu  Cu5  1  0.347  0.653  0.750  1.0
  W  W6  1  0.689  0.935  0.286  1.0
  W  W7  1  0.311  0.065  0.714  1.0
  W  W8  1  0.065  0.311  0.214  1.0
  W  W9  1  0.935  0.689  0.786  1.0
  W  W10  1  0.756  0.132  0.592  1.0
  W  W11  1  0.244  0.868  0.408  1.0
  W  W12  1  0.868  0.244  0.908  1.0
  W  W13  1  0.132  0.756  0.092  1.0
  O  O14  1  0.778  0.960  0.102  1.0
  O  O15  1  0.222  0.040  0.898  1.0
  O  O16  1  0.040  0.222  0.398  1.0
  O  O17  1  0.960  0.778  0.602  1.0
  O  O18  1  0.257  0.209  0.054  1.0
  O  O19  1  0.743  0.791  0.946  1.0
  O  O20  1  0.791  0.743  0.446  1.0
  O  O21  1  0.209  0.257  0.554  1.0
  O  O22  1  0.528  0.214  0.325  1.0
  O  O23  1  0.472  0.786  0.675  1.0
  O  O24  1  0.786  0.472  0.175  1.0
  O  O25  1  0.214  0.528  0.825  1.0
  O  O26  1  0.873  0.105  0.411  1.0
  O  O27  1  0.127  0.895  0.589  1.0
  O  O28  1  0.895  0.127  0.089  1.0
  O  O29  1  0.105  0.873  0.911  1.0
  O  O30  1  0.523  0.715  0.426  1.0
  O  O31  1  0.477  0.285  0.574  1.0
  O  O32  1  0.285  0.477  0.074  1.0
  O  O33  1  0.715  0.523  0.926  1.0
  O  O34  1  0.394  0.633  0.121  1.0
  O  O35  1  0.606  0.367  0.879  1.0
  O  O36  1  0.367  0.606  0.379  1.0
  O  O37  1  0.633  0.394  0.621  1.0
  O  O38  1  0.415  0.077  0.264  1.0
  O  O39  1  0.585  0.923  0.736  1.0
  O  O40  1  0.923  0.585  0.236  1.0
  O  O41  1  0.077  0.415  0.764  1.0
  O  O42  1  0.240  0.975  0.228  1.0
  O  O43  1  0.760  0.025  0.772  1.0
  O  O44  1  0.025  0.760  0.272  1.0
  O  O45  1  0.975  0.240  0.728  1.0
[/CIF]
.