The material described by Na2SrSn4 crystallizes in the monoclinic C2/c space group. Na(1) is bonded in a 6-coordinate geometry to two equivalent Sn(1) and four equivalent Sn(2) atoms. Sr(1) is bonded to four equivalent Sn(2) and eight equivalent Sn(1) atoms to form a mixture of distorted face and edge-sharing SrSn12 cuboctahedra. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to two equivalent Na(1), four equivalent Sr(1), one Sn(1), and two equivalent Sn(2) atoms. In the second Sn site, Sn(2) is bonded in a 10-coordinate geometry to four equivalent Na(1), two equivalent Sr(1), two equivalent Sn(1), and two equivalent Sn(2) atoms. is represented by the CIF card [CIF]
data_Na2SrSn4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.052
_cell_length_b   10.052
_cell_length_c   6.622
_cell_angle_alpha   86.313
_cell_angle_beta   86.313
_cell_angle_gamma   39.522
_symmetry_Int_Tables_number   1
_cell_volume   424.824
_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  0.601  0.802  0.799  1.0
  Na  Na1  1  0.198  0.399  0.701  1.0
  Na  Na2  1  0.399  0.198  0.201  1.0
  Na  Na3  1  0.802  0.601  0.299  1.0
  Sr  Sr4  1  0.775  0.225  0.250  1.0
  Sr  Sr5  1  0.225  0.775  0.750  1.0
  Sn  Sn6  1  0.369  0.787  0.228  1.0
  Sn  Sn7  1  0.213  0.631  0.272  1.0
  Sn  Sn8  1  0.631  0.213  0.772  1.0
  Sn  Sn9  1  0.787  0.369  0.728  1.0
  Sn  Sn10  1  0.136  0.171  0.985  1.0
  Sn  Sn11  1  0.829  0.864  0.515  1.0
  Sn  Sn12  1  0.864  0.829  0.015  1.0
  Sn  Sn13  1  0.171  0.136  0.485  1.0
[/CIF]
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The material described by Na2SrSn4 crystallizes in the monoclinic C2/c space group. Na(1) is bonded in a 6-coordinate geometry to two equivalent Sn(1) and four equivalent Sn(2) atoms. Sr(1) is bonded to four equivalent Sn(2) and eight equivalent Sn(1) atoms to form a mixture of distorted face and edge-sharing SrSn12 cuboctahedra. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to two equivalent Na(1), four equivalent Sr(1), one Sn(1), and two equivalent Sn(2) atoms. In the second Sn site, Sn(2) is bonded in a 10-coordinate geometry to four equivalent Na(1), two equivalent Sr(1), two equivalent Sn(1), and two equivalent Sn(2) atoms. is represented by the CIF card [CIF]
data_Na2SrSn4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.052
_cell_length_b   10.052
_cell_length_c   6.622
_cell_angle_alpha   86.313
_cell_angle_beta   86.313
_cell_angle_gamma   39.522
_symmetry_Int_Tables_number   1
_cell_volume   424.824
_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  0.601  0.802  0.799  1.0
  Na  Na1  1  0.198  0.399  0.701  1.0
  Na  Na2  1  0.399  0.198  0.201  1.0
  Na  Na3  1  0.802  0.601  0.299  1.0
  Sr  Sr4  1  0.775  0.225  0.250  1.0
  Sr  Sr5  1  0.225  0.775  0.750  1.0
  Sn  Sn6  1  0.369  0.787  0.228  1.0
  Sn  Sn7  1  0.213  0.631  0.272  1.0
  Sn  Sn8  1  0.631  0.213  0.772  1.0
  Sn  Sn9  1  0.787  0.369  0.728  1.0
  Sn  Sn10  1  0.136  0.171  0.985  1.0
  Sn  Sn11  1  0.829  0.864  0.515  1.0
  Sn  Sn12  1  0.864  0.829  0.015  1.0
  Sn  Sn13  1  0.171  0.136  0.485  1.0
[/CIF]
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