The material described by Na5YW4O16 crystallizes in the tetragonal I4_1/a space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms to form distorted NaO6 pentagonal pyramids that share corners with two equivalent Na(2)O4 tetrahedra, corners with six equivalent W(1)O4 tetrahedra, and edges with two equivalent Na(1)O6 pentagonal pyramids. In the second Na site, Na(2) is bonded to four equivalent O(1) atoms to form distorted NaO4 tetrahedra that share corners with eight equivalent Na(1)O6 pentagonal pyramids and corners with four equivalent W(1)O4 tetrahedra. Y(1) is bonded in a 8-coordinate geometry to four equivalent O(2) and four equivalent O(3) atoms. W(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form WO4 tetrahedra that share corners with six equivalent Na(1)O6 pentagonal pyramids and  a cornercorner with one Na(2)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Na(2), two equivalent Na(1), and one W(1) atom to form distorted corner-sharing ONa3W tetrahedra. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Na(1), one Y(1), and one W(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Na(1), one Y(1), and one W(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one W(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na5Y(WO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.035
_cell_length_b   10.035
_cell_length_c   10.035
_cell_angle_alpha   108.886
_cell_angle_beta   108.886
_cell_angle_gamma   110.649
_symmetry_Int_Tables_number   1
_cell_volume   777.774
_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
  Na  Na0  1  0.014  0.100  0.675  1.0
  Na  Na1  1  0.350  0.175  0.586  1.0
  Na  Na2  1  0.589  0.764  0.414  1.0
  Na  Na3  1  0.425  0.339  0.325  1.0
  Na  Na4  1  0.236  0.650  0.825  1.0
  Na  Na5  1  0.500  0.500  0.000  1.0
  Na  Na6  1  0.661  0.986  0.086  1.0
  Na  Na7  1  0.825  0.411  0.175  1.0
  Na  Na8  1  0.750  0.250  0.500  1.0
  Na  Na9  1  0.900  0.575  0.914  1.0
  Y  Y10  1  0.000  0.000  0.000  1.0
  Y  Y11  1  0.250  0.750  0.500  1.0
  W  W12  1  0.082  0.306  0.409  1.0
  W  W13  1  0.923  0.832  0.276  1.0
  W  W14  1  0.556  0.647  0.724  1.0
  W  W15  1  0.897  0.673  0.591  1.0
  W  W16  1  0.353  0.077  0.909  1.0
  W  W17  1  0.327  0.918  0.224  1.0
  W  W18  1  0.694  0.103  0.776  1.0
  W  W19  1  0.168  0.444  0.091  1.0
  O  O20  1  0.382  0.500  0.178  1.0
  O  O21  1  0.750  0.072  0.618  1.0
  O  O22  1  0.454  0.132  0.382  1.0
  O  O23  1  0.322  0.204  0.822  1.0
  O  O24  1  0.868  0.250  0.322  1.0
  O  O25  1  0.500  0.678  0.882  1.0
  O  O26  1  0.796  0.618  0.118  1.0
  O  O27  1  0.928  0.546  0.678  1.0
  O  O28  1  0.147  0.244  0.257  1.0
  O  O29  1  0.494  0.737  0.597  1.0
  O  O30  1  0.140  0.897  0.403  1.0
  O  O31  1  0.987  0.890  0.743  1.0
  O  O32  1  0.103  0.506  0.243  1.0
  O  O33  1  0.756  0.013  0.903  1.0
  O  O34  1  0.110  0.853  0.097  1.0
  O  O35  1  0.263  0.860  0.757  1.0
  O  O36  1  0.049  0.224  0.947  1.0
  O  O37  1  0.474  0.026  0.674  1.0
  O  O38  1  0.352  0.799  0.326  1.0
  O  O39  1  0.276  0.102  0.053  1.0
  O  O40  1  0.679  0.579  0.468  1.0
  O  O41  1  0.829  0.860  0.399  1.0
  O  O42  1  0.461  0.429  0.601  1.0
  O  O43  1  0.110  0.211  0.532  1.0
  O  O44  1  0.571  0.171  0.032  1.0
  O  O45  1  0.421  0.890  0.101  1.0
  O  O46  1  0.789  0.321  0.899  1.0
  O  O47  1  0.140  0.539  0.968  1.0
  O  O48  1  0.974  0.648  0.447  1.0
  O  O49  1  0.898  0.951  0.174  1.0
  O  O50  1  0.776  0.724  0.826  1.0
  O  O51  1  0.201  0.526  0.553  1.0
[/CIF]
.
The material described by Na5YW4O16 crystallizes in the tetragonal I4_1/a space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms to form distorted NaO6 pentagonal pyramids that share corners with two equivalent Na(2)O4 tetrahedra, corners with six equivalent W(1)O4 tetrahedra, and edges with two equivalent Na(1)O6 pentagonal pyramids. In the second Na site, Na(2) is bonded to four equivalent O(1) atoms to form distorted NaO4 tetrahedra that share corners with eight equivalent Na(1)O6 pentagonal pyramids and corners with four equivalent W(1)O4 tetrahedra. Y(1) is bonded in a 8-coordinate geometry to four equivalent O(2) and four equivalent O(3) atoms. W(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form WO4 tetrahedra that share corners with six equivalent Na(1)O6 pentagonal pyramids and  a cornercorner with one Na(2)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Na(2), two equivalent Na(1), and one W(1) atom to form distorted corner-sharing ONa3W tetrahedra. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Na(1), one Y(1), and one W(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Na(1), one Y(1), and one W(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one W(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na5Y(WO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.035
_cell_length_b   10.035
_cell_length_c   10.035
_cell_angle_alpha   108.886
_cell_angle_beta   108.886
_cell_angle_gamma   110.649
_symmetry_Int_Tables_number   1
_cell_volume   777.774
_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
  Na  Na0  1  0.014  0.100  0.675  1.0
  Na  Na1  1  0.350  0.175  0.586  1.0
  Na  Na2  1  0.589  0.764  0.414  1.0
  Na  Na3  1  0.425  0.339  0.325  1.0
  Na  Na4  1  0.236  0.650  0.825  1.0
  Na  Na5  1  0.500  0.500  0.000  1.0
  Na  Na6  1  0.661  0.986  0.086  1.0
  Na  Na7  1  0.825  0.411  0.175  1.0
  Na  Na8  1  0.750  0.250  0.500  1.0
  Na  Na9  1  0.900  0.575  0.914  1.0
  Y  Y10  1  0.000  0.000  0.000  1.0
  Y  Y11  1  0.250  0.750  0.500  1.0
  W  W12  1  0.082  0.306  0.409  1.0
  W  W13  1  0.923  0.832  0.276  1.0
  W  W14  1  0.556  0.647  0.724  1.0
  W  W15  1  0.897  0.673  0.591  1.0
  W  W16  1  0.353  0.077  0.909  1.0
  W  W17  1  0.327  0.918  0.224  1.0
  W  W18  1  0.694  0.103  0.776  1.0
  W  W19  1  0.168  0.444  0.091  1.0
  O  O20  1  0.382  0.500  0.178  1.0
  O  O21  1  0.750  0.072  0.618  1.0
  O  O22  1  0.454  0.132  0.382  1.0
  O  O23  1  0.322  0.204  0.822  1.0
  O  O24  1  0.868  0.250  0.322  1.0
  O  O25  1  0.500  0.678  0.882  1.0
  O  O26  1  0.796  0.618  0.118  1.0
  O  O27  1  0.928  0.546  0.678  1.0
  O  O28  1  0.147  0.244  0.257  1.0
  O  O29  1  0.494  0.737  0.597  1.0
  O  O30  1  0.140  0.897  0.403  1.0
  O  O31  1  0.987  0.890  0.743  1.0
  O  O32  1  0.103  0.506  0.243  1.0
  O  O33  1  0.756  0.013  0.903  1.0
  O  O34  1  0.110  0.853  0.097  1.0
  O  O35  1  0.263  0.860  0.757  1.0
  O  O36  1  0.049  0.224  0.947  1.0
  O  O37  1  0.474  0.026  0.674  1.0
  O  O38  1  0.352  0.799  0.326  1.0
  O  O39  1  0.276  0.102  0.053  1.0
  O  O40  1  0.679  0.579  0.468  1.0
  O  O41  1  0.829  0.860  0.399  1.0
  O  O42  1  0.461  0.429  0.601  1.0
  O  O43  1  0.110  0.211  0.532  1.0
  O  O44  1  0.571  0.171  0.032  1.0
  O  O45  1  0.421  0.890  0.101  1.0
  O  O46  1  0.789  0.321  0.899  1.0
  O  O47  1  0.140  0.539  0.968  1.0
  O  O48  1  0.974  0.648  0.447  1.0
  O  O49  1  0.898  0.951  0.174  1.0
  O  O50  1  0.776  0.724  0.826  1.0
  O  O51  1  0.201  0.526  0.553  1.0
[/CIF]
.