The structure described by SrAs3 crystallizes in the triclinic P-1 space group. Sr(1) is bonded to one As(1), three equivalent As(3), and four equivalent As(2) atoms to form distorted SrAs8 hexagonal bipyramids that share corners with six equivalent Sr(1)As8 hexagonal bipyramids, corners with five equivalent As(2)Sr4As2 pentagonal pyramids, corners with six equivalent As(1)SrAs3 tetrahedra, edges with four equivalent Sr(1)As8 hexagonal bipyramids,  an edgeedge with one As(1)SrAs3 tetrahedra, and  a faceface with one Sr(1)As8 hexagonal bipyramid. There are three inequivalent As sites. In the first As site, As(1) is bonded to one Sr(1), one As(1), one As(2), and one As(3) atom to form distorted AsSrAs3 tetrahedra that share corners with six equivalent Sr(1)As8 hexagonal bipyramids, corners with six equivalent As(2)Sr4As2 pentagonal pyramids, and  an edgeedge with one Sr(1)As8 hexagonal bipyramid. In the second As site, As(2) is bonded to four equivalent Sr(1), one As(1), and one As(2) atom to form distorted AsSr4As2 pentagonal pyramids that share corners with five equivalent Sr(1)As8 hexagonal bipyramids, corners with four equivalent As(2)Sr4As2 pentagonal pyramids, corners with six equivalent As(1)SrAs3 tetrahedra, and edges with four equivalent As(2)Sr4As2 pentagonal pyramids. In the third As site, As(3) is bonded in a 5-coordinate geometry to three equivalent Sr(1), one As(1), and one As(3) atom. is represented by the CIF file [CIF]
data_SrAs3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.022
_cell_length_b   6.187
_cell_length_c   6.244
_cell_angle_alpha   77.693
_cell_angle_beta   70.183
_cell_angle_gamma   74.262
_symmetry_Int_Tables_number   1
_cell_volume   208.772
_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  0.661  0.678  0.649  1.0
  Sr  Sr1  1  0.339  0.322  0.351  1.0
  As  As2  1  0.788  1.000  0.009  1.0
  As  As3  1  0.212  0.000  0.991  1.0
  As  As4  1  0.183  0.863  0.401  1.0
  As  As5  1  0.817  0.137  0.599  1.0
  As  As6  1  0.793  0.590  0.115  1.0
  As  As7  1  0.207  0.410  0.885  1.0
[/CIF]
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The structure described by SrAs3 crystallizes in the triclinic P-1 space group. Sr(1) is bonded to one As(1), three equivalent As(3), and four equivalent As(2) atoms to form distorted SrAs8 hexagonal bipyramids that share corners with six equivalent Sr(1)As8 hexagonal bipyramids, corners with five equivalent As(2)Sr4As2 pentagonal pyramids, corners with six equivalent As(1)SrAs3 tetrahedra, edges with four equivalent Sr(1)As8 hexagonal bipyramids,  an edgeedge with one As(1)SrAs3 tetrahedra, and  a faceface with one Sr(1)As8 hexagonal bipyramid. There are three inequivalent As sites. In the first As site, As(1) is bonded to one Sr(1), one As(1), one As(2), and one As(3) atom to form distorted AsSrAs3 tetrahedra that share corners with six equivalent Sr(1)As8 hexagonal bipyramids, corners with six equivalent As(2)Sr4As2 pentagonal pyramids, and  an edgeedge with one Sr(1)As8 hexagonal bipyramid. In the second As site, As(2) is bonded to four equivalent Sr(1), one As(1), and one As(2) atom to form distorted AsSr4As2 pentagonal pyramids that share corners with five equivalent Sr(1)As8 hexagonal bipyramids, corners with four equivalent As(2)Sr4As2 pentagonal pyramids, corners with six equivalent As(1)SrAs3 tetrahedra, and edges with four equivalent As(2)Sr4As2 pentagonal pyramids. In the third As site, As(3) is bonded in a 5-coordinate geometry to three equivalent Sr(1), one As(1), and one As(3) atom. is represented by the CIF file [CIF]
data_SrAs3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.022
_cell_length_b   6.187
_cell_length_c   6.244
_cell_angle_alpha   77.693
_cell_angle_beta   70.183
_cell_angle_gamma   74.262
_symmetry_Int_Tables_number   1
_cell_volume   208.772
_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  0.661  0.678  0.649  1.0
  Sr  Sr1  1  0.339  0.322  0.351  1.0
  As  As2  1  0.788  1.000  0.009  1.0
  As  As3  1  0.212  0.000  0.991  1.0
  As  As4  1  0.183  0.863  0.401  1.0
  As  As5  1  0.817  0.137  0.599  1.0
  As  As6  1  0.793  0.590  0.115  1.0
  As  As7  1  0.207  0.410  0.885  1.0
[/CIF]
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