The structure described by Sr3As4 crystallizes in the orthorhombic Fdd2 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to four equivalent As(1) and four equivalent As(2) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to four equivalent As(1) and four equivalent As(2) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to two equivalent Sr(2), four equivalent Sr(1), one As(1), and one As(2) atom. In the second As site, As(2) is bonded in a 7-coordinate geometry to two equivalent Sr(2), four equivalent Sr(1), and one As(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr3As4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.019
_cell_length_b   8.052
_cell_length_c   9.482
_cell_angle_alpha   83.187
_cell_angle_beta   71.494
_cell_angle_gamma   68.052
_symmetry_Int_Tables_number   1
_cell_volume   404.254
_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
  Sr  Sr0  1  0.555  0.005  0.334  1.0
  Sr  Sr1  1  0.894  0.995  0.666  1.0
  Sr  Sr2  1  0.310  0.495  0.834  1.0
  Sr  Sr3  1  0.639  0.505  0.166  1.0
  Sr  Sr4  1  0.002  0.500  0.500  1.0
  Sr  Sr5  1  0.252  0.000  0.000  1.0
  As  As6  1  0.414  0.671  0.504  1.0
  As  As7  1  0.589  0.329  0.496  1.0
  As  As8  1  0.835  0.829  0.004  1.0
  As  As9  1  0.668  0.171  0.996  1.0
  As  As10  1  0.317  0.172  0.659  1.0
  As  As11  1  0.148  0.828  0.341  1.0
  As  As12  1  0.726  0.672  0.841  1.0
  As  As13  1  0.239  0.328  0.159  1.0
[/CIF]
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The structure described by Sr3As4 crystallizes in the orthorhombic Fdd2 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to four equivalent As(1) and four equivalent As(2) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to four equivalent As(1) and four equivalent As(2) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to two equivalent Sr(2), four equivalent Sr(1), one As(1), and one As(2) atom. In the second As site, As(2) is bonded in a 7-coordinate geometry to two equivalent Sr(2), four equivalent Sr(1), and one As(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr3As4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.019
_cell_length_b   8.052
_cell_length_c   9.482
_cell_angle_alpha   83.187
_cell_angle_beta   71.494
_cell_angle_gamma   68.052
_symmetry_Int_Tables_number   1
_cell_volume   404.254
_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
  Sr  Sr0  1  0.555  0.005  0.334  1.0
  Sr  Sr1  1  0.894  0.995  0.666  1.0
  Sr  Sr2  1  0.310  0.495  0.834  1.0
  Sr  Sr3  1  0.639  0.505  0.166  1.0
  Sr  Sr4  1  0.002  0.500  0.500  1.0
  Sr  Sr5  1  0.252  0.000  0.000  1.0
  As  As6  1  0.414  0.671  0.504  1.0
  As  As7  1  0.589  0.329  0.496  1.0
  As  As8  1  0.835  0.829  0.004  1.0
  As  As9  1  0.668  0.171  0.996  1.0
  As  As10  1  0.317  0.172  0.659  1.0
  As  As11  1  0.148  0.828  0.341  1.0
  As  As12  1  0.726  0.672  0.841  1.0
  As  As13  1  0.239  0.328  0.159  1.0
[/CIF]
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