The compound described by Eu4As2O is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a distorted linear geometry to four equivalent As(1) and two equivalent O(1) atoms. In the second Eu site, Eu(2) is bonded in a 6-coordinate geometry to five equivalent As(1) and one O(1) atom. As(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1) and five equivalent Eu(2) atoms. O(1) is bonded to two equivalent Eu(2) and four equivalent Eu(1) atoms to form corner-sharing OEu6 octahedra. The corner-sharing octahedra are not tilted. is represented by the Crystallographic Information File (CIF) [CIF]
data_Eu4As2O
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.687
_cell_length_b   8.687
_cell_length_c   8.687
_cell_angle_alpha   148.221
_cell_angle_beta   148.221
_cell_angle_gamma   45.559
_symmetry_Int_Tables_number   1
_cell_volume   181.247
_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
  Eu  Eu0  1  0.000  0.500  0.500  1.0
  Eu  Eu1  1  0.500  0.000  0.500  1.0
  Eu  Eu2  1  0.674  0.674  0.000  1.0
  Eu  Eu3  1  0.326  0.326  0.000  1.0
  As  As4  1  0.865  0.865  0.000  1.0
  As  As5  1  0.135  0.135  0.000  1.0
  O  O6  1  0.500  0.500  0.000  1.0
[/CIF]
.
The compound described by Eu4As2O is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a distorted linear geometry to four equivalent As(1) and two equivalent O(1) atoms. In the second Eu site, Eu(2) is bonded in a 6-coordinate geometry to five equivalent As(1) and one O(1) atom. As(1) is bonded in a 9-coordinate geometry to four equivalent Eu(1) and five equivalent Eu(2) atoms. O(1) is bonded to two equivalent Eu(2) and four equivalent Eu(1) atoms to form corner-sharing OEu6 octahedra. The corner-sharing octahedra are not tilted. is represented by the Crystallographic Information File (CIF) [CIF]
data_Eu4As2O
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.687
_cell_length_b   8.687
_cell_length_c   8.687
_cell_angle_alpha   148.221
_cell_angle_beta   148.221
_cell_angle_gamma   45.559
_symmetry_Int_Tables_number   1
_cell_volume   181.247
_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
  Eu  Eu0  1  0.000  0.500  0.500  1.0
  Eu  Eu1  1  0.500  0.000  0.500  1.0
  Eu  Eu2  1  0.674  0.674  0.000  1.0
  Eu  Eu3  1  0.326  0.326  0.000  1.0
  As  As4  1  0.865  0.865  0.000  1.0
  As  As5  1  0.135  0.135  0.000  1.0
  O  O6  1  0.500  0.500  0.000  1.0
[/CIF]
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