The crystal structure described by Na5Nd4Si4O17 crystallizes in the tetragonal I-4 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 7-coordinate geometry to one O(2), one O(4), one O(5), and four equivalent O(3) atoms. In the second Na site, Na(2) is bonded in a 10-coordinate geometry to two equivalent O(1), four equivalent O(2), and four equivalent O(5) atoms. Nd(1) is bonded in a 8-coordinate geometry to one O(1), one O(3), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. Si(1) is bonded in a tetrahedral geometry to one O(2), one O(3), one O(4), and one O(5) atom. There are five inequivalent O sites. In the first O site, O(4) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Nd(1), and one Si(1) atom. In the second O site, O(5) is bonded in a 1-coordinate geometry to one Na(1), one Na(2), two equivalent Nd(1), and one Si(1) atom. In the third O site, O(1) is bonded to two equivalent Na(2) and four equivalent Nd(1) atoms to form corner-sharing ONa2Nd4 octahedra. The corner-sharing octahedra are not tilted. In the fourth O site, O(2) is bonded in a 1-coordinate geometry to one Na(1), one Na(2), two equivalent Nd(1), and one Si(1) atom. In the fifth O site, O(3) is bonded in a 1-coordinate geometry to four equivalent Na(1), one Nd(1), and one Si(1) atom. is represented by the CIF file [CIF]
data_Na5Nd4Si4O17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.935
_cell_length_b   8.935
_cell_length_c   8.935
_cell_angle_alpha   95.549
_cell_angle_beta   95.549
_cell_angle_gamma   143.766
_symmetry_Int_Tables_number   1
_cell_volume   400.719
_cell_formula_units_Z   1
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  0.405  0.100  0.485  1.0
  Na  Na1  1  0.615  0.920  0.515  1.0
  Na  Na2  1  0.900  0.385  0.305  1.0
  Na  Na3  1  0.080  0.595  0.695  1.0
  Na  Na4  1  0.500  0.500  0.000  1.0
  Nd  Nd5  1  0.863  0.797  0.701  1.0
  Nd  Nd6  1  0.096  0.162  0.299  1.0
  Nd  Nd7  1  0.203  0.904  0.066  1.0
  Nd  Nd8  1  0.838  0.137  0.934  1.0
  Si  Si9  1  0.261  0.407  0.650  1.0
  Si  Si10  1  0.757  0.612  0.350  1.0
  Si  Si11  1  0.593  0.243  0.854  1.0
  Si  Si12  1  0.388  0.739  0.146  1.0
  O  O13  1  0.000  0.000  0.000  1.0
  O  O14  1  0.543  0.719  0.754  1.0
  O  O15  1  0.965  0.789  0.246  1.0
  O  O16  1  0.281  0.035  0.824  1.0
  O  O17  1  0.211  0.457  0.176  1.0
  O  O18  1  0.865  0.586  0.491  1.0
  O  O19  1  0.096  0.375  0.509  1.0
  O  O20  1  0.414  0.904  0.279  1.0
  O  O21  1  0.625  0.135  0.721  1.0
  O  O22  1  0.350  0.322  0.568  1.0
  O  O23  1  0.754  0.782  0.432  1.0
  O  O24  1  0.678  0.246  0.029  1.0
  O  O25  1  0.218  0.650  0.971  1.0
  O  O26  1  0.460  0.317  0.236  1.0
  O  O27  1  0.081  0.224  0.764  1.0
  O  O28  1  0.683  0.919  0.143  1.0
  O  O29  1  0.776  0.540  0.857  1.0
[/CIF]
.
The crystal structure described by Na5Nd4Si4O17 crystallizes in the tetragonal I-4 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 7-coordinate geometry to one O(2), one O(4), one O(5), and four equivalent O(3) atoms. In the second Na site, Na(2) is bonded in a 10-coordinate geometry to two equivalent O(1), four equivalent O(2), and four equivalent O(5) atoms. Nd(1) is bonded in a 8-coordinate geometry to one O(1), one O(3), two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. Si(1) is bonded in a tetrahedral geometry to one O(2), one O(3), one O(4), and one O(5) atom. There are five inequivalent O sites. In the first O site, O(4) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Nd(1), and one Si(1) atom. In the second O site, O(5) is bonded in a 1-coordinate geometry to one Na(1), one Na(2), two equivalent Nd(1), and one Si(1) atom. In the third O site, O(1) is bonded to two equivalent Na(2) and four equivalent Nd(1) atoms to form corner-sharing ONa2Nd4 octahedra. The corner-sharing octahedra are not tilted. In the fourth O site, O(2) is bonded in a 1-coordinate geometry to one Na(1), one Na(2), two equivalent Nd(1), and one Si(1) atom. In the fifth O site, O(3) is bonded in a 1-coordinate geometry to four equivalent Na(1), one Nd(1), and one Si(1) atom. is represented by the CIF file [CIF]
data_Na5Nd4Si4O17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.935
_cell_length_b   8.935
_cell_length_c   8.935
_cell_angle_alpha   95.549
_cell_angle_beta   95.549
_cell_angle_gamma   143.766
_symmetry_Int_Tables_number   1
_cell_volume   400.719
_cell_formula_units_Z   1
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  0.405  0.100  0.485  1.0
  Na  Na1  1  0.615  0.920  0.515  1.0
  Na  Na2  1  0.900  0.385  0.305  1.0
  Na  Na3  1  0.080  0.595  0.695  1.0
  Na  Na4  1  0.500  0.500  0.000  1.0
  Nd  Nd5  1  0.863  0.797  0.701  1.0
  Nd  Nd6  1  0.096  0.162  0.299  1.0
  Nd  Nd7  1  0.203  0.904  0.066  1.0
  Nd  Nd8  1  0.838  0.137  0.934  1.0
  Si  Si9  1  0.261  0.407  0.650  1.0
  Si  Si10  1  0.757  0.612  0.350  1.0
  Si  Si11  1  0.593  0.243  0.854  1.0
  Si  Si12  1  0.388  0.739  0.146  1.0
  O  O13  1  0.000  0.000  0.000  1.0
  O  O14  1  0.543  0.719  0.754  1.0
  O  O15  1  0.965  0.789  0.246  1.0
  O  O16  1  0.281  0.035  0.824  1.0
  O  O17  1  0.211  0.457  0.176  1.0
  O  O18  1  0.865  0.586  0.491  1.0
  O  O19  1  0.096  0.375  0.509  1.0
  O  O20  1  0.414  0.904  0.279  1.0
  O  O21  1  0.625  0.135  0.721  1.0
  O  O22  1  0.350  0.322  0.568  1.0
  O  O23  1  0.754  0.782  0.432  1.0
  O  O24  1  0.678  0.246  0.029  1.0
  O  O25  1  0.218  0.650  0.971  1.0
  O  O26  1  0.460  0.317  0.236  1.0
  O  O27  1  0.081  0.224  0.764  1.0
  O  O28  1  0.683  0.919  0.143  1.0
  O  O29  1  0.776  0.540  0.857  1.0
[/CIF]
.