The crystal structure described by NaNa2Si17 crystallizes in the cubic Fd-3m space group. The structure consists of eight 7440-23-5 atoms inside a Na2Si17 framework. In the Na2Si17 framework, Na(2) is bonded in a 20-coordinate geometry to two equivalent Si(1), six equivalent Si(2), and twelve equivalent Si(3) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a body-centered cubic geometry to four equivalent Na(2) and four equivalent Si(2) atoms. In the second Si site, Si(2) is bonded in a 7-coordinate geometry to three equivalent Na(2), one Si(1), and three equivalent Si(3) atoms. In the third Si site, Si(3) is bonded in a 6-coordinate geometry to two equivalent Na(2), one Si(2), and three equivalent Si(3) atoms. is represented by the CIF card [CIF]
data_Na3Si17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.397
_cell_length_b   10.397
_cell_length_c   10.397
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   794.694
_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  0.625  0.625  0.625  1.0
  Na  Na1  1  0.375  0.375  0.375  1.0
  Na  Na2  1  0.000  0.500  0.000  1.0
  Na  Na3  1  0.000  0.000  0.500  1.0
  Na  Na4  1  0.500  0.000  0.000  1.0
  Na  Na5  1  0.000  0.000  0.000  1.0
  Si  Si6  1  0.875  0.875  0.875  1.0
  Si  Si7  1  0.125  0.125  0.125  1.0
  Si  Si8  1  0.782  0.154  0.782  1.0
  Si  Si9  1  0.782  0.782  0.154  1.0
  Si  Si10  1  0.154  0.782  0.782  1.0
  Si  Si11  1  0.782  0.782  0.782  1.0
  Si  Si12  1  0.218  0.846  0.218  1.0
  Si  Si13  1  0.218  0.218  0.846  1.0
  Si  Si14  1  0.846  0.218  0.218  1.0
  Si  Si15  1  0.218  0.218  0.218  1.0
  Si  Si16  1  0.629  0.236  0.629  1.0
  Si  Si17  1  0.006  0.629  0.236  1.0
  Si  Si18  1  0.236  0.629  0.006  1.0
  Si  Si19  1  0.629  0.006  0.629  1.0
  Si  Si20  1  0.236  0.629  0.629  1.0
  Si  Si21  1  0.629  0.236  0.006  1.0
  Si  Si22  1  0.629  0.006  0.236  1.0
  Si  Si23  1  0.006  0.629  0.629  1.0
  Si  Si24  1  0.629  0.629  0.236  1.0
  Si  Si25  1  0.236  0.006  0.629  1.0
  Si  Si26  1  0.006  0.236  0.629  1.0
  Si  Si27  1  0.629  0.629  0.006  1.0
  Si  Si28  1  0.371  0.764  0.371  1.0
  Si  Si29  1  0.994  0.371  0.764  1.0
  Si  Si30  1  0.764  0.371  0.994  1.0
  Si  Si31  1  0.371  0.994  0.371  1.0
  Si  Si32  1  0.764  0.371  0.371  1.0
  Si  Si33  1  0.371  0.764  0.994  1.0
  Si  Si34  1  0.371  0.994  0.764  1.0
  Si  Si35  1  0.994  0.371  0.371  1.0
  Si  Si36  1  0.371  0.371  0.764  1.0
  Si  Si37  1  0.764  0.994  0.371  1.0
  Si  Si38  1  0.994  0.764  0.371  1.0
  Si  Si39  1  0.371  0.371  0.994  1.0
[/CIF]
.
The crystal structure described by NaNa2Si17 crystallizes in the cubic Fd-3m space group. The structure consists of eight 7440-23-5 atoms inside a Na2Si17 framework. In the Na2Si17 framework, Na(2) is bonded in a 20-coordinate geometry to two equivalent Si(1), six equivalent Si(2), and twelve equivalent Si(3) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a body-centered cubic geometry to four equivalent Na(2) and four equivalent Si(2) atoms. In the second Si site, Si(2) is bonded in a 7-coordinate geometry to three equivalent Na(2), one Si(1), and three equivalent Si(3) atoms. In the third Si site, Si(3) is bonded in a 6-coordinate geometry to two equivalent Na(2), one Si(2), and three equivalent Si(3) atoms. is represented by the CIF card [CIF]
data_Na3Si17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.397
_cell_length_b   10.397
_cell_length_c   10.397
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   794.694
_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  0.625  0.625  0.625  1.0
  Na  Na1  1  0.375  0.375  0.375  1.0
  Na  Na2  1  0.000  0.500  0.000  1.0
  Na  Na3  1  0.000  0.000  0.500  1.0
  Na  Na4  1  0.500  0.000  0.000  1.0
  Na  Na5  1  0.000  0.000  0.000  1.0
  Si  Si6  1  0.875  0.875  0.875  1.0
  Si  Si7  1  0.125  0.125  0.125  1.0
  Si  Si8  1  0.782  0.154  0.782  1.0
  Si  Si9  1  0.782  0.782  0.154  1.0
  Si  Si10  1  0.154  0.782  0.782  1.0
  Si  Si11  1  0.782  0.782  0.782  1.0
  Si  Si12  1  0.218  0.846  0.218  1.0
  Si  Si13  1  0.218  0.218  0.846  1.0
  Si  Si14  1  0.846  0.218  0.218  1.0
  Si  Si15  1  0.218  0.218  0.218  1.0
  Si  Si16  1  0.629  0.236  0.629  1.0
  Si  Si17  1  0.006  0.629  0.236  1.0
  Si  Si18  1  0.236  0.629  0.006  1.0
  Si  Si19  1  0.629  0.006  0.629  1.0
  Si  Si20  1  0.236  0.629  0.629  1.0
  Si  Si21  1  0.629  0.236  0.006  1.0
  Si  Si22  1  0.629  0.006  0.236  1.0
  Si  Si23  1  0.006  0.629  0.629  1.0
  Si  Si24  1  0.629  0.629  0.236  1.0
  Si  Si25  1  0.236  0.006  0.629  1.0
  Si  Si26  1  0.006  0.236  0.629  1.0
  Si  Si27  1  0.629  0.629  0.006  1.0
  Si  Si28  1  0.371  0.764  0.371  1.0
  Si  Si29  1  0.994  0.371  0.764  1.0
  Si  Si30  1  0.764  0.371  0.994  1.0
  Si  Si31  1  0.371  0.994  0.371  1.0
  Si  Si32  1  0.764  0.371  0.371  1.0
  Si  Si33  1  0.371  0.764  0.994  1.0
  Si  Si34  1  0.371  0.994  0.764  1.0
  Si  Si35  1  0.994  0.371  0.371  1.0
  Si  Si36  1  0.371  0.371  0.764  1.0
  Si  Si37  1  0.764  0.994  0.371  1.0
  Si  Si38  1  0.994  0.764  0.371  1.0
  Si  Si39  1  0.371  0.371  0.994  1.0
[/CIF]
.