The structure described by NaSr4(FeAs)10 crystallizes in the tetragonal I4/m space group. Na(1) is bonded in a distorted body-centered cubic geometry to eight equivalent As(1) atoms. Sr(1) is bonded in a distorted body-centered cubic geometry to two equivalent As(2) and six equivalent As(1) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one As(2) and three equivalent As(1) atoms to form a mixture of edge and corner-sharing FeAs4 tetrahedra. In the second Fe site, Fe(2) is bonded to four equivalent As(1) atoms to form a mixture of edge and corner-sharing FeAs4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to one Na(1), three equivalent Sr(1), one Fe(2), and three equivalent Fe(1) atoms. In the second As site, As(2) is bonded in a 8-coordinate geometry to four equivalent Sr(1) and four equivalent Fe(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_NaSr4(FeAs)10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.858
_cell_length_b   8.553
_cell_length_c   8.858
_cell_angle_alpha   58.812
_cell_angle_beta   90.000
_cell_angle_gamma   58.812
_symmetry_Int_Tables_number   1
_cell_volume   456.977
_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  0.000  0.000  0.000  1.0
  Sr  Sr1  1  0.198  0.000  0.605  1.0
  Sr  Sr2  1  0.395  0.000  0.198  1.0
  Sr  Sr3  1  0.605  0.000  0.802  1.0
  Sr  Sr4  1  0.802  0.000  0.395  1.0
  Fe  Fe5  1  0.950  0.501  0.849  1.0
  Fe  Fe6  1  0.151  0.499  0.450  1.0
  Fe  Fe7  1  0.350  0.499  0.050  1.0
  Fe  Fe8  1  0.550  0.501  0.650  1.0
  Fe  Fe9  1  0.750  0.500  0.250  1.0
  Fe  Fe10  1  0.849  0.501  0.550  1.0
  Fe  Fe11  1  0.050  0.499  0.151  1.0
  Fe  Fe12  1  0.250  0.500  0.750  1.0
  Fe  Fe13  1  0.450  0.499  0.350  1.0
  Fe  Fe14  1  0.650  0.501  0.950  1.0
  As  As15  1  0.153  0.293  0.753  1.0
  As  As16  1  0.353  0.293  0.353  1.0
  As  As17  1  0.554  0.293  0.953  1.0
  As  As18  1  0.753  0.293  0.554  1.0
  As  As19  1  0.953  0.293  0.153  1.0
  As  As20  1  0.647  0.707  0.647  1.0
  As  As21  1  0.847  0.707  0.247  1.0
  As  As22  1  0.047  0.707  0.847  1.0
  As  As23  1  0.247  0.707  0.446  1.0
  As  As24  1  0.446  0.707  0.047  1.0
[/CIF]
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The structure described by NaSr4(FeAs)10 crystallizes in the tetragonal I4/m space group. Na(1) is bonded in a distorted body-centered cubic geometry to eight equivalent As(1) atoms. Sr(1) is bonded in a distorted body-centered cubic geometry to two equivalent As(2) and six equivalent As(1) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one As(2) and three equivalent As(1) atoms to form a mixture of edge and corner-sharing FeAs4 tetrahedra. In the second Fe site, Fe(2) is bonded to four equivalent As(1) atoms to form a mixture of edge and corner-sharing FeAs4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to one Na(1), three equivalent Sr(1), one Fe(2), and three equivalent Fe(1) atoms. In the second As site, As(2) is bonded in a 8-coordinate geometry to four equivalent Sr(1) and four equivalent Fe(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_NaSr4(FeAs)10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.858
_cell_length_b   8.553
_cell_length_c   8.858
_cell_angle_alpha   58.812
_cell_angle_beta   90.000
_cell_angle_gamma   58.812
_symmetry_Int_Tables_number   1
_cell_volume   456.977
_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  0.000  0.000  0.000  1.0
  Sr  Sr1  1  0.198  0.000  0.605  1.0
  Sr  Sr2  1  0.395  0.000  0.198  1.0
  Sr  Sr3  1  0.605  0.000  0.802  1.0
  Sr  Sr4  1  0.802  0.000  0.395  1.0
  Fe  Fe5  1  0.950  0.501  0.849  1.0
  Fe  Fe6  1  0.151  0.499  0.450  1.0
  Fe  Fe7  1  0.350  0.499  0.050  1.0
  Fe  Fe8  1  0.550  0.501  0.650  1.0
  Fe  Fe9  1  0.750  0.500  0.250  1.0
  Fe  Fe10  1  0.849  0.501  0.550  1.0
  Fe  Fe11  1  0.050  0.499  0.151  1.0
  Fe  Fe12  1  0.250  0.500  0.750  1.0
  Fe  Fe13  1  0.450  0.499  0.350  1.0
  Fe  Fe14  1  0.650  0.501  0.950  1.0
  As  As15  1  0.153  0.293  0.753  1.0
  As  As16  1  0.353  0.293  0.353  1.0
  As  As17  1  0.554  0.293  0.953  1.0
  As  As18  1  0.753  0.293  0.554  1.0
  As  As19  1  0.953  0.293  0.153  1.0
  As  As20  1  0.647  0.707  0.647  1.0
  As  As21  1  0.847  0.707  0.247  1.0
  As  As22  1  0.047  0.707  0.847  1.0
  As  As23  1  0.247  0.707  0.446  1.0
  As  As24  1  0.446  0.707  0.047  1.0
[/CIF]
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