The crystal structure described by Na(SrAs)4 is Magnesium tetraboride-derived structured and crystallizes in the orthorhombic Pnma space group. Na(1) is bonded to one As(1), two equivalent As(2), and two equivalent As(3) atoms to form distorted NaAs5 square pyramids that share corners with six equivalent Sr(2)As7 pentagonal bipyramids, corners with two equivalent Na(1)As5 square pyramids, and faces with four equivalent Sr(2)As7 pentagonal bipyramids. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one As(3), two equivalent As(1), and three equivalent As(2) atoms. In the second Sr site, Sr(2) is bonded to one As(1), two equivalent As(3), and four equivalent As(2) atoms to form distorted SrAs7 pentagonal bipyramids that share corners with six equivalent Sr(2)As7 pentagonal bipyramids, corners with three equivalent Na(1)As5 square pyramids, edges with two equivalent Sr(2)As7 pentagonal bipyramids, faces with three equivalent Sr(2)As7 pentagonal bipyramids, and faces with two equivalent Na(1)As5 square pyramids. There are three inequivalent As sites. In the first As site, As(3) is bonded in a 9-coordinate geometry to two equivalent Na(1), two equivalent Sr(1), four equivalent Sr(2), and one As(1) atom. In the second As site, As(1) is bonded in a 8-coordinate geometry to one Na(1), two equivalent Sr(2), four equivalent Sr(1), and one As(3) atom. In the third As site, As(2) is bonded in a 8-coordinate geometry to one Na(1), three equivalent Sr(1), and four equivalent Sr(2) atoms. is represented by the CIF file [CIF]
data_Na(SrAs)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.830
_cell_length_b   8.313
_cell_length_c   15.945
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1037.821
_cell_formula_units_Z   4
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  0.184  0.518  0.750  1.0
  Na  Na1  1  0.816  0.482  0.250  1.0
  Na  Na2  1  0.316  0.018  0.250  1.0
  Na  Na3  1  0.684  0.982  0.750  1.0
  Sr  Sr4  1  0.352  0.167  0.623  1.0
  Sr  Sr5  1  0.648  0.833  0.377  1.0
  Sr  Sr6  1  0.148  0.667  0.377  1.0
  Sr  Sr7  1  0.648  0.833  0.123  1.0
  Sr  Sr8  1  0.852  0.333  0.623  1.0
  Sr  Sr9  1  0.352  0.167  0.877  1.0
  Sr  Sr10  1  0.852  0.333  0.877  1.0
  Sr  Sr11  1  0.148  0.667  0.123  1.0
  Sr  Sr12  1  0.003  0.193  0.095  1.0
  Sr  Sr13  1  0.997  0.807  0.905  1.0
  Sr  Sr14  1  0.497  0.693  0.905  1.0
  Sr  Sr15  1  0.997  0.807  0.595  1.0
  Sr  Sr16  1  0.503  0.307  0.095  1.0
  Sr  Sr17  1  0.003  0.193  0.405  1.0
  Sr  Sr18  1  0.503  0.307  0.405  1.0
  Sr  Sr19  1  0.497  0.693  0.595  1.0
  As  As20  1  0.050  0.084  0.750  1.0
  As  As21  1  0.950  0.916  0.250  1.0
  As  As22  1  0.450  0.584  0.250  1.0
  As  As23  1  0.550  0.416  0.750  1.0
  As  As24  1  0.194  0.463  0.538  1.0
  As  As25  1  0.806  0.537  0.462  1.0
  As  As26  1  0.306  0.963  0.462  1.0
  As  As27  1  0.806  0.537  0.038  1.0
  As  As28  1  0.694  0.037  0.538  1.0
  As  As29  1  0.194  0.463  0.962  1.0
  As  As30  1  0.694  0.037  0.962  1.0
  As  As31  1  0.306  0.963  0.038  1.0
  As  As32  1  0.284  0.873  0.750  1.0
  As  As33  1  0.716  0.127  0.250  1.0
  As  As34  1  0.216  0.373  0.250  1.0
  As  As35  1  0.784  0.627  0.750  1.0
[/CIF]
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The crystal structure described by Na(SrAs)4 is Magnesium tetraboride-derived structured and crystallizes in the orthorhombic Pnma space group. Na(1) is bonded to one As(1), two equivalent As(2), and two equivalent As(3) atoms to form distorted NaAs5 square pyramids that share corners with six equivalent Sr(2)As7 pentagonal bipyramids, corners with two equivalent Na(1)As5 square pyramids, and faces with four equivalent Sr(2)As7 pentagonal bipyramids. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one As(3), two equivalent As(1), and three equivalent As(2) atoms. In the second Sr site, Sr(2) is bonded to one As(1), two equivalent As(3), and four equivalent As(2) atoms to form distorted SrAs7 pentagonal bipyramids that share corners with six equivalent Sr(2)As7 pentagonal bipyramids, corners with three equivalent Na(1)As5 square pyramids, edges with two equivalent Sr(2)As7 pentagonal bipyramids, faces with three equivalent Sr(2)As7 pentagonal bipyramids, and faces with two equivalent Na(1)As5 square pyramids. There are three inequivalent As sites. In the first As site, As(3) is bonded in a 9-coordinate geometry to two equivalent Na(1), two equivalent Sr(1), four equivalent Sr(2), and one As(1) atom. In the second As site, As(1) is bonded in a 8-coordinate geometry to one Na(1), two equivalent Sr(2), four equivalent Sr(1), and one As(3) atom. In the third As site, As(2) is bonded in a 8-coordinate geometry to one Na(1), three equivalent Sr(1), and four equivalent Sr(2) atoms. is represented by the CIF file [CIF]
data_Na(SrAs)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.830
_cell_length_b   8.313
_cell_length_c   15.945
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1037.821
_cell_formula_units_Z   4
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  0.184  0.518  0.750  1.0
  Na  Na1  1  0.816  0.482  0.250  1.0
  Na  Na2  1  0.316  0.018  0.250  1.0
  Na  Na3  1  0.684  0.982  0.750  1.0
  Sr  Sr4  1  0.352  0.167  0.623  1.0
  Sr  Sr5  1  0.648  0.833  0.377  1.0
  Sr  Sr6  1  0.148  0.667  0.377  1.0
  Sr  Sr7  1  0.648  0.833  0.123  1.0
  Sr  Sr8  1  0.852  0.333  0.623  1.0
  Sr  Sr9  1  0.352  0.167  0.877  1.0
  Sr  Sr10  1  0.852  0.333  0.877  1.0
  Sr  Sr11  1  0.148  0.667  0.123  1.0
  Sr  Sr12  1  0.003  0.193  0.095  1.0
  Sr  Sr13  1  0.997  0.807  0.905  1.0
  Sr  Sr14  1  0.497  0.693  0.905  1.0
  Sr  Sr15  1  0.997  0.807  0.595  1.0
  Sr  Sr16  1  0.503  0.307  0.095  1.0
  Sr  Sr17  1  0.003  0.193  0.405  1.0
  Sr  Sr18  1  0.503  0.307  0.405  1.0
  Sr  Sr19  1  0.497  0.693  0.595  1.0
  As  As20  1  0.050  0.084  0.750  1.0
  As  As21  1  0.950  0.916  0.250  1.0
  As  As22  1  0.450  0.584  0.250  1.0
  As  As23  1  0.550  0.416  0.750  1.0
  As  As24  1  0.194  0.463  0.538  1.0
  As  As25  1  0.806  0.537  0.462  1.0
  As  As26  1  0.306  0.963  0.462  1.0
  As  As27  1  0.806  0.537  0.038  1.0
  As  As28  1  0.694  0.037  0.538  1.0
  As  As29  1  0.194  0.463  0.962  1.0
  As  As30  1  0.694  0.037  0.962  1.0
  As  As31  1  0.306  0.963  0.038  1.0
  As  As32  1  0.284  0.873  0.750  1.0
  As  As33  1  0.716  0.127  0.250  1.0
  As  As34  1  0.216  0.373  0.250  1.0
  As  As35  1  0.784  0.627  0.750  1.0
[/CIF]
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