The structure described by Na4Sr(SiO3)3 crystallizes in the triclinic P1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(9) atom to form distorted NaO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. In the second Na site, Na(2) is bonded in a distorted bent 120 degrees geometry to one O(2), one O(4), and one O(6) atom. In the third Na site, Na(3) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. In the fourth Na site, Na(4) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(9) atom. Sr(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(4), one O(5), one O(7), and one O(8) atom to form SiO4 tetrahedra that share corners with two equivalent Na(1)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 40°. In the second Si site, Si(2) is bonded to one O(1), one O(6), one O(7), and one O(9) atom to form SiO4 tetrahedra that share corners with two equivalent Na(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 40°. In the third Si site, Si(3) is bonded to one O(1), one O(2), one O(3), and one O(8) atom to form SiO4 tetrahedra that share corners with two equivalent Na(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 40°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Sr(1), one Si(2), and one Si(3) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Sr(1), and one Si(3) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), one Na(4), one Sr(1), and one Si(3) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Sr(1), and one Si(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one Sr(1), and one Si(1) atom. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(3), one Sr(1), and one Si(2) atom. In the seventh O site, O(7) is bonded in a distorted linear geometry to one Sr(1), one Si(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a linear geometry to one Sr(1), one Si(1), and one Si(3) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Na(1), one Na(4), one Sr(1), and one Si(2) atom. is represented by the CIF card [CIF]
data_Na4Sr(SiO3)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.707
_cell_length_b   6.707
_cell_length_c   6.707
_cell_angle_alpha   109.538
_cell_angle_beta   109.538
_cell_angle_gamma   109.538
_symmetry_Int_Tables_number   1
_cell_volume   231.654
_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  0.500  0.500  0.500  1.0
  Na  Na1  1  0.000  0.528  0.472  1.0
  Na  Na2  1  0.472  0.000  0.528  1.0
  Na  Na3  1  0.528  0.472  0.000  1.0
  Sr  Sr4  1  0.000  0.000  0.000  1.0
  Si  Si5  1  0.963  0.037  0.500  1.0
  Si  Si6  1  0.500  0.963  0.037  1.0
  Si  Si7  1  0.037  0.500  0.963  1.0
  O  O8  1  0.259  0.741  0.000  1.0
  O  O9  1  0.122  0.460  0.192  1.0
  O  O10  1  0.808  0.540  0.878  1.0
  O  O11  1  0.878  0.808  0.540  1.0
  O  O12  1  0.192  0.122  0.460  1.0
  O  O13  1  0.524  0.866  0.792  1.0
  O  O14  1  0.741  0.000  0.259  1.0
  O  O15  1  0.000  0.259  0.741  1.0
  O  O16  1  0.460  0.192  0.122  1.0
[/CIF]
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The structure described by Na4Sr(SiO3)3 crystallizes in the triclinic P1 space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(9) atom to form distorted NaO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. In the second Na site, Na(2) is bonded in a distorted bent 120 degrees geometry to one O(2), one O(4), and one O(6) atom. In the third Na site, Na(3) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. In the fourth Na site, Na(4) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(9) atom. Sr(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(4), one O(5), one O(7), and one O(8) atom to form SiO4 tetrahedra that share corners with two equivalent Na(1)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 40°. In the second Si site, Si(2) is bonded to one O(1), one O(6), one O(7), and one O(9) atom to form SiO4 tetrahedra that share corners with two equivalent Na(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 40°. In the third Si site, Si(3) is bonded to one O(1), one O(2), one O(3), and one O(8) atom to form SiO4 tetrahedra that share corners with two equivalent Na(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 40°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Sr(1), one Si(2), and one Si(3) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Sr(1), and one Si(3) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), one Na(4), one Sr(1), and one Si(3) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Sr(1), and one Si(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one Sr(1), and one Si(1) atom. In the sixth O site, O(6) is bonded in a 5-coordinate geometry to one Na(1), one Na(2), one Na(3), one Sr(1), and one Si(2) atom. In the seventh O site, O(7) is bonded in a distorted linear geometry to one Sr(1), one Si(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a linear geometry to one Sr(1), one Si(1), and one Si(3) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Na(1), one Na(4), one Sr(1), and one Si(2) atom. is represented by the CIF card [CIF]
data_Na4Sr(SiO3)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.707
_cell_length_b   6.707
_cell_length_c   6.707
_cell_angle_alpha   109.538
_cell_angle_beta   109.538
_cell_angle_gamma   109.538
_symmetry_Int_Tables_number   1
_cell_volume   231.654
_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  0.500  0.500  0.500  1.0
  Na  Na1  1  0.000  0.528  0.472  1.0
  Na  Na2  1  0.472  0.000  0.528  1.0
  Na  Na3  1  0.528  0.472  0.000  1.0
  Sr  Sr4  1  0.000  0.000  0.000  1.0
  Si  Si5  1  0.963  0.037  0.500  1.0
  Si  Si6  1  0.500  0.963  0.037  1.0
  Si  Si7  1  0.037  0.500  0.963  1.0
  O  O8  1  0.259  0.741  0.000  1.0
  O  O9  1  0.122  0.460  0.192  1.0
  O  O10  1  0.808  0.540  0.878  1.0
  O  O11  1  0.878  0.808  0.540  1.0
  O  O12  1  0.192  0.122  0.460  1.0
  O  O13  1  0.524  0.866  0.792  1.0
  O  O14  1  0.741  0.000  0.259  1.0
  O  O15  1  0.000  0.259  0.741  1.0
  O  O16  1  0.460  0.192  0.122  1.0
[/CIF]
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