The structure described by (Na)2NaSi34 crystallizes in the trigonal R-3m space group. The structure consists of six 7440-23-5 atoms inside a NaSi34 framework. In the NaSi34 framework, Na(2) is bonded in a 20-coordinate geometry to two equivalent Si(3), six equivalent Si(2), and twelve equivalent Si(5) atoms. There are six inequivalent Si sites. In the first Si site, Si(1) is bonded to one Si(3) and three equivalent Si(4) atoms to form corner-sharing SiSi4 tetrahedra. In the second Si site, Si(2) is bonded in a 5-coordinate geometry to one Na(2), one Si(3), one Si(6), and two equivalent Si(5) atoms. In the third Si site, Si(3) is bonded in a distorted pentagonal planar geometry to one Na(2), one Si(1), and three equivalent Si(2) atoms. In the fourth Si site, Si(4) is bonded to one Si(1), one Si(6), and two equivalent Si(5) atoms to form corner-sharing SiSi4 tetrahedra. In the fifth Si site, Si(5) is bonded in a 5-coordinate geometry to one Na(2), one Si(2), one Si(4), and two equivalent Si(5) atoms. In the sixth Si site, Si(6) is bonded to one Si(2), one Si(4), and two equivalent Si(6) atoms to form corner-sharing SiSi4 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na3Si34
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.370
_cell_length_b   10.370
_cell_length_c   10.370
_cell_angle_alpha   59.926
_cell_angle_beta   59.926
_cell_angle_gamma   59.926
_symmetry_Int_Tables_number   1
_cell_volume   787.276
_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  0.375  0.375  0.375  1.0
  Na  Na1  1  0.625  0.625  0.625  1.0
  Na  Na2  1  0.000  0.000  0.000  1.0
  Si  Si3  1  0.218  0.218  0.218  1.0
  Si  Si4  1  0.848  0.218  0.218  1.0
  Si  Si5  1  0.218  0.218  0.848  1.0
  Si  Si6  1  0.218  0.848  0.218  1.0
  Si  Si7  1  0.782  0.782  0.782  1.0
  Si  Si8  1  0.152  0.782  0.782  1.0
  Si  Si9  1  0.782  0.782  0.152  1.0
  Si  Si10  1  0.782  0.152  0.782  1.0
  Si  Si11  1  0.125  0.125  0.125  1.0
  Si  Si12  1  0.875  0.875  0.875  1.0
  Si  Si13  1  0.371  0.995  0.371  1.0
  Si  Si14  1  0.763  0.371  0.995  1.0
  Si  Si15  1  0.995  0.371  0.763  1.0
  Si  Si16  1  0.371  0.763  0.371  1.0
  Si  Si17  1  0.371  0.995  0.763  1.0
  Si  Si18  1  0.995  0.371  0.371  1.0
  Si  Si19  1  0.763  0.371  0.371  1.0
  Si  Si20  1  0.371  0.763  0.995  1.0
  Si  Si21  1  0.763  0.995  0.371  1.0
  Si  Si22  1  0.371  0.371  0.763  1.0
  Si  Si23  1  0.371  0.371  0.995  1.0
  Si  Si24  1  0.995  0.763  0.371  1.0
  Si  Si25  1  0.629  0.005  0.629  1.0
  Si  Si26  1  0.237  0.629  0.005  1.0
  Si  Si27  1  0.005  0.629  0.237  1.0
  Si  Si28  1  0.629  0.237  0.629  1.0
  Si  Si29  1  0.629  0.005  0.237  1.0
  Si  Si30  1  0.005  0.629  0.629  1.0
  Si  Si31  1  0.237  0.629  0.629  1.0
  Si  Si32  1  0.629  0.237  0.005  1.0
  Si  Si33  1  0.237  0.005  0.629  1.0
  Si  Si34  1  0.629  0.629  0.237  1.0
  Si  Si35  1  0.629  0.629  0.005  1.0
  Si  Si36  1  0.005  0.237  0.629  1.0
[/CIF]
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The structure described by (Na)2NaSi34 crystallizes in the trigonal R-3m space group. The structure consists of six 7440-23-5 atoms inside a NaSi34 framework. In the NaSi34 framework, Na(2) is bonded in a 20-coordinate geometry to two equivalent Si(3), six equivalent Si(2), and twelve equivalent Si(5) atoms. There are six inequivalent Si sites. In the first Si site, Si(1) is bonded to one Si(3) and three equivalent Si(4) atoms to form corner-sharing SiSi4 tetrahedra. In the second Si site, Si(2) is bonded in a 5-coordinate geometry to one Na(2), one Si(3), one Si(6), and two equivalent Si(5) atoms. In the third Si site, Si(3) is bonded in a distorted pentagonal planar geometry to one Na(2), one Si(1), and three equivalent Si(2) atoms. In the fourth Si site, Si(4) is bonded to one Si(1), one Si(6), and two equivalent Si(5) atoms to form corner-sharing SiSi4 tetrahedra. In the fifth Si site, Si(5) is bonded in a 5-coordinate geometry to one Na(2), one Si(2), one Si(4), and two equivalent Si(5) atoms. In the sixth Si site, Si(6) is bonded to one Si(2), one Si(4), and two equivalent Si(6) atoms to form corner-sharing SiSi4 tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na3Si34
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.370
_cell_length_b   10.370
_cell_length_c   10.370
_cell_angle_alpha   59.926
_cell_angle_beta   59.926
_cell_angle_gamma   59.926
_symmetry_Int_Tables_number   1
_cell_volume   787.276
_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  0.375  0.375  0.375  1.0
  Na  Na1  1  0.625  0.625  0.625  1.0
  Na  Na2  1  0.000  0.000  0.000  1.0
  Si  Si3  1  0.218  0.218  0.218  1.0
  Si  Si4  1  0.848  0.218  0.218  1.0
  Si  Si5  1  0.218  0.218  0.848  1.0
  Si  Si6  1  0.218  0.848  0.218  1.0
  Si  Si7  1  0.782  0.782  0.782  1.0
  Si  Si8  1  0.152  0.782  0.782  1.0
  Si  Si9  1  0.782  0.782  0.152  1.0
  Si  Si10  1  0.782  0.152  0.782  1.0
  Si  Si11  1  0.125  0.125  0.125  1.0
  Si  Si12  1  0.875  0.875  0.875  1.0
  Si  Si13  1  0.371  0.995  0.371  1.0
  Si  Si14  1  0.763  0.371  0.995  1.0
  Si  Si15  1  0.995  0.371  0.763  1.0
  Si  Si16  1  0.371  0.763  0.371  1.0
  Si  Si17  1  0.371  0.995  0.763  1.0
  Si  Si18  1  0.995  0.371  0.371  1.0
  Si  Si19  1  0.763  0.371  0.371  1.0
  Si  Si20  1  0.371  0.763  0.995  1.0
  Si  Si21  1  0.763  0.995  0.371  1.0
  Si  Si22  1  0.371  0.371  0.763  1.0
  Si  Si23  1  0.371  0.371  0.995  1.0
  Si  Si24  1  0.995  0.763  0.371  1.0
  Si  Si25  1  0.629  0.005  0.629  1.0
  Si  Si26  1  0.237  0.629  0.005  1.0
  Si  Si27  1  0.005  0.629  0.237  1.0
  Si  Si28  1  0.629  0.237  0.629  1.0
  Si  Si29  1  0.629  0.005  0.237  1.0
  Si  Si30  1  0.005  0.629  0.629  1.0
  Si  Si31  1  0.237  0.629  0.629  1.0
  Si  Si32  1  0.629  0.237  0.005  1.0
  Si  Si33  1  0.237  0.005  0.629  1.0
  Si  Si34  1  0.629  0.629  0.237  1.0
  Si  Si35  1  0.629  0.629  0.005  1.0
  Si  Si36  1  0.005  0.237  0.629  1.0
[/CIF]
.