The crystal structure described by Mg(W2O3)2 crystallizes in the orthorhombic Cmcm space group. Mg(1) is bonded in a distorted see-saw-like geometry to two equivalent O(3) and two equivalent O(4) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(2), two equivalent O(1), and two equivalent O(3) atoms to form a mixture of corner and edge-sharing WO5 square pyramids. In the second W site, W(2) is bonded in a 6-coordinate geometry to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent W(2) and four equivalent W(1) atoms to form OW6 octahedra that share corners with two equivalent O(4)Mg2W2 tetrahedra, corners with eight equivalent O(3)MgW4 trigonal bipyramids, edges with two equivalent O(1)W6 octahedra, and edges with two equivalent O(3)MgW4 trigonal bipyramids. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one W(1) and two equivalent W(2) atoms. In the third O site, O(3) is bonded to one Mg(1), two equivalent W(1), and two equivalent W(2) atoms to form distorted OMgW4 trigonal bipyramids that share corners with four equivalent O(1)W6 octahedra,  a cornercorner with one O(3)MgW4 trigonal bipyramid,  an edgeedge with one O(1)W6 octahedra, edges with two equivalent O(4)Mg2W2 tetrahedra, and edges with two equivalent O(3)MgW4 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 13-73°. In the fourth O site, O(4) is bonded to two equivalent Mg(1) and two equivalent W(2) atoms to form OMg2W2 tetrahedra that share corners with two equivalent O(1)W6 octahedra, corners with two equivalent O(4)Mg2W2 tetrahedra, and edges with four equivalent O(3)MgW4 trigonal bipyramids. The corner-sharing octahedral tilt angles are 3°. is represented by the CIF file [CIF]
data_Mg(W2O3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.637
_cell_length_b   5.637
_cell_length_c   16.722
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   146.684
_symmetry_Int_Tables_number   1
_cell_volume   291.820
_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
  Mg  Mg0  1  0.328  0.672  0.750  1.0
  Mg  Mg1  1  0.672  0.328  0.250  1.0
  W  W2  1  0.128  0.872  0.053  1.0
  W  W3  1  0.626  0.374  0.638  1.0
  W  W4  1  0.872  0.128  0.947  1.0
  W  W5  1  0.374  0.626  0.362  1.0
  W  W6  1  0.128  0.872  0.447  1.0
  W  W7  1  0.872  0.128  0.553  1.0
  W  W8  1  0.374  0.626  0.138  1.0
  W  W9  1  0.626  0.374  0.862  1.0
  O  O10  1  0.500  0.500  0.500  1.0
  O  O11  1  0.500  0.500  0.000  1.0
  O  O12  1  0.999  0.001  0.847  1.0
  O  O13  1  0.001  0.999  0.153  1.0
  O  O14  1  0.001  0.999  0.347  1.0
  O  O15  1  0.999  0.001  0.653  1.0
  O  O16  1  0.280  0.720  0.874  1.0
  O  O17  1  0.720  0.280  0.126  1.0
  O  O18  1  0.720  0.280  0.374  1.0
  O  O19  1  0.280  0.720  0.626  1.0
  O  O20  1  0.715  0.285  0.750  1.0
  O  O21  1  0.285  0.715  0.250  1.0
[/CIF]
.
The crystal structure described by Mg(W2O3)2 crystallizes in the orthorhombic Cmcm space group. Mg(1) is bonded in a distorted see-saw-like geometry to two equivalent O(3) and two equivalent O(4) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(2), two equivalent O(1), and two equivalent O(3) atoms to form a mixture of corner and edge-sharing WO5 square pyramids. In the second W site, W(2) is bonded in a 6-coordinate geometry to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent W(2) and four equivalent W(1) atoms to form OW6 octahedra that share corners with two equivalent O(4)Mg2W2 tetrahedra, corners with eight equivalent O(3)MgW4 trigonal bipyramids, edges with two equivalent O(1)W6 octahedra, and edges with two equivalent O(3)MgW4 trigonal bipyramids. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one W(1) and two equivalent W(2) atoms. In the third O site, O(3) is bonded to one Mg(1), two equivalent W(1), and two equivalent W(2) atoms to form distorted OMgW4 trigonal bipyramids that share corners with four equivalent O(1)W6 octahedra,  a cornercorner with one O(3)MgW4 trigonal bipyramid,  an edgeedge with one O(1)W6 octahedra, edges with two equivalent O(4)Mg2W2 tetrahedra, and edges with two equivalent O(3)MgW4 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 13-73°. In the fourth O site, O(4) is bonded to two equivalent Mg(1) and two equivalent W(2) atoms to form OMg2W2 tetrahedra that share corners with two equivalent O(1)W6 octahedra, corners with two equivalent O(4)Mg2W2 tetrahedra, and edges with four equivalent O(3)MgW4 trigonal bipyramids. The corner-sharing octahedral tilt angles are 3°. is represented by the CIF file [CIF]
data_Mg(W2O3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.637
_cell_length_b   5.637
_cell_length_c   16.722
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   146.684
_symmetry_Int_Tables_number   1
_cell_volume   291.820
_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
  Mg  Mg0  1  0.328  0.672  0.750  1.0
  Mg  Mg1  1  0.672  0.328  0.250  1.0
  W  W2  1  0.128  0.872  0.053  1.0
  W  W3  1  0.626  0.374  0.638  1.0
  W  W4  1  0.872  0.128  0.947  1.0
  W  W5  1  0.374  0.626  0.362  1.0
  W  W6  1  0.128  0.872  0.447  1.0
  W  W7  1  0.872  0.128  0.553  1.0
  W  W8  1  0.374  0.626  0.138  1.0
  W  W9  1  0.626  0.374  0.862  1.0
  O  O10  1  0.500  0.500  0.500  1.0
  O  O11  1  0.500  0.500  0.000  1.0
  O  O12  1  0.999  0.001  0.847  1.0
  O  O13  1  0.001  0.999  0.153  1.0
  O  O14  1  0.001  0.999  0.347  1.0
  O  O15  1  0.999  0.001  0.653  1.0
  O  O16  1  0.280  0.720  0.874  1.0
  O  O17  1  0.720  0.280  0.126  1.0
  O  O18  1  0.720  0.280  0.374  1.0
  O  O19  1  0.280  0.720  0.626  1.0
  O  O20  1  0.715  0.285  0.750  1.0
  O  O21  1  0.285  0.715  0.250  1.0
[/CIF]
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