The structure described by Eu3As4 crystallizes in the monoclinic Cc space group. There are three inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to two equivalent As(1), two equivalent As(2), two equivalent As(3), and two equivalent As(4) atoms to form a mixture of corner and edge-sharing EuAs8 hexagonal bipyramids. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to two equivalent As(1), two equivalent As(2), two equivalent As(3), and two equivalent As(4) atoms. In the third Eu site, Eu(3) is bonded in a 8-coordinate geometry to two equivalent As(1), two equivalent As(2), two equivalent As(3), and two equivalent As(4) atoms. There are four inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), two equivalent Eu(3), one As(3), and one As(4) atom. In the second As site, As(2) is bonded in a 7-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), two equivalent Eu(3), and one As(4) atom. In the third As site, As(3) is bonded in a 7-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), two equivalent Eu(3), and one As(1) atom. In the fourth As site, As(4) is bonded in a 8-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), two equivalent Eu(3), one As(1), and one As(2) atom. is represented by the CIF file [CIF]
data_Eu3As4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.844
_cell_length_b   7.844
_cell_length_c   9.102
_cell_angle_alpha   83.303
_cell_angle_beta   83.303
_cell_angle_gamma   136.794
_symmetry_Int_Tables_number   1
_cell_volume   363.639
_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
  Eu  Eu0  1  0.889  0.627  0.169  1.0
  Eu  Eu1  1  0.546  0.298  0.834  1.0
  Eu  Eu2  1  0.298  0.546  0.334  1.0
  Eu  Eu3  1  0.627  0.889  0.669  1.0
  Eu  Eu4  1  0.005  0.249  0.001  1.0
  Eu  Eu5  1  0.249  0.005  0.501  1.0
  As  As6  1  0.597  0.663  0.993  1.0
  As  As7  1  0.134  0.713  0.832  1.0
  As  As8  1  0.663  0.597  0.493  1.0
  As  As9  1  0.306  0.219  0.163  1.0
  As  As10  1  0.713  0.134  0.332  1.0
  As  As11  1  0.841  0.409  0.511  1.0
  As  As12  1  0.409  0.841  0.011  1.0
  As  As13  1  0.219  0.306  0.663  1.0
[/CIF]
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The structure described by Eu3As4 crystallizes in the monoclinic Cc space group. There are three inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to two equivalent As(1), two equivalent As(2), two equivalent As(3), and two equivalent As(4) atoms to form a mixture of corner and edge-sharing EuAs8 hexagonal bipyramids. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to two equivalent As(1), two equivalent As(2), two equivalent As(3), and two equivalent As(4) atoms. In the third Eu site, Eu(3) is bonded in a 8-coordinate geometry to two equivalent As(1), two equivalent As(2), two equivalent As(3), and two equivalent As(4) atoms. There are four inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), two equivalent Eu(3), one As(3), and one As(4) atom. In the second As site, As(2) is bonded in a 7-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), two equivalent Eu(3), and one As(4) atom. In the third As site, As(3) is bonded in a 7-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), two equivalent Eu(3), and one As(1) atom. In the fourth As site, As(4) is bonded in a 8-coordinate geometry to two equivalent Eu(1), two equivalent Eu(2), two equivalent Eu(3), one As(1), and one As(2) atom. is represented by the CIF file [CIF]
data_Eu3As4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.844
_cell_length_b   7.844
_cell_length_c   9.102
_cell_angle_alpha   83.303
_cell_angle_beta   83.303
_cell_angle_gamma   136.794
_symmetry_Int_Tables_number   1
_cell_volume   363.639
_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
  Eu  Eu0  1  0.889  0.627  0.169  1.0
  Eu  Eu1  1  0.546  0.298  0.834  1.0
  Eu  Eu2  1  0.298  0.546  0.334  1.0
  Eu  Eu3  1  0.627  0.889  0.669  1.0
  Eu  Eu4  1  0.005  0.249  0.001  1.0
  Eu  Eu5  1  0.249  0.005  0.501  1.0
  As  As6  1  0.597  0.663  0.993  1.0
  As  As7  1  0.134  0.713  0.832  1.0
  As  As8  1  0.663  0.597  0.493  1.0
  As  As9  1  0.306  0.219  0.163  1.0
  As  As10  1  0.713  0.134  0.332  1.0
  As  As11  1  0.841  0.409  0.511  1.0
  As  As12  1  0.409  0.841  0.011  1.0
  As  As13  1  0.219  0.306  0.663  1.0
[/CIF]
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