The compound described by Sr2As crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 5-coordinate geometry to five equivalent As(1) atoms. In the second Sr site, Sr(2) is bonded in a distorted square co-planar geometry to four equivalent As(1) atoms. As(1) is bonded in a 9-coordinate geometry to four equivalent Sr(2) and five equivalent Sr(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2As
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.863
_cell_length_b   4.863
_cell_length_c   9.146
_cell_angle_alpha   105.416
_cell_angle_beta   105.416
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   200.407
_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  0.319  0.319  0.637  1.0
  Sr  Sr1  1  0.681  0.681  0.363  1.0
  Sr  Sr2  1  0.000  0.500  0.000  1.0
  Sr  Sr3  1  0.500  0.000  0.000  1.0
  As  As4  1  0.867  0.867  0.733  1.0
  As  As5  1  0.133  0.133  0.267  1.0
[/CIF]
.
The compound described by Sr2As crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 5-coordinate geometry to five equivalent As(1) atoms. In the second Sr site, Sr(2) is bonded in a distorted square co-planar geometry to four equivalent As(1) atoms. As(1) is bonded in a 9-coordinate geometry to four equivalent Sr(2) and five equivalent Sr(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2As
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.863
_cell_length_b   4.863
_cell_length_c   9.146
_cell_angle_alpha   105.416
_cell_angle_beta   105.416
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   200.407
_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  0.319  0.319  0.637  1.0
  Sr  Sr1  1  0.681  0.681  0.363  1.0
  Sr  Sr2  1  0.000  0.500  0.000  1.0
  Sr  Sr3  1  0.500  0.000  0.000  1.0
  As  As4  1  0.867  0.867  0.733  1.0
  As  As5  1  0.133  0.133  0.267  1.0
[/CIF]
.