The material structure described by Eu5As4 crystallizes in the orthorhombic Cmce space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to three equivalent As(1) and three equivalent As(2) atoms to form a mixture of distorted corner, edge, and face-sharing EuAs6 pentagonal pyramids. The corner-sharing octahedral tilt angles range from 38-43°. In the second Eu site, Eu(2) is bonded to two equivalent As(1) and four equivalent As(2) atoms to form a mixture of corner and face-sharing EuAs6 octahedra. The corner-sharing octahedral tilt angles are 53°. There are two inequivalent As sites. In the first As site, As(1) is bonded to one Eu(2) and six equivalent Eu(1) atoms to form a mixture of distorted corner and edge-sharing AsEu7 pentagonal bipyramids. In the second As site, As(2) is bonded in a 9-coordinate geometry to two equivalent Eu(2), six equivalent Eu(1), and one As(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Eu5As4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.015
_cell_length_b   8.053
_cell_length_c   8.673
_cell_angle_alpha   90.000
_cell_angle_beta   117.518
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   496.472
_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  0.189  0.165  0.717  1.0
  Eu  Eu1  1  0.529  0.835  0.717  1.0
  Eu  Eu2  1  0.029  0.665  0.717  1.0
  Eu  Eu3  1  0.689  0.335  0.717  1.0
  Eu  Eu4  1  0.811  0.835  0.283  1.0
  Eu  Eu5  1  0.471  0.165  0.283  1.0
  Eu  Eu6  1  0.971  0.335  0.283  1.0
  Eu  Eu7  1  0.311  0.665  0.283  1.0
  Eu  Eu8  1  0.500  0.500  0.000  1.0
  Eu  Eu9  1  0.000  0.000  0.000  1.0
  As  As10  1  0.300  0.500  0.600  1.0
  As  As11  1  0.800  0.000  0.600  1.0
  As  As12  1  0.700  0.500  0.400  1.0
  As  As13  1  0.200  0.000  0.400  1.0
  As  As14  1  0.624  0.125  0.000  1.0
  As  As15  1  0.376  0.875  0.000  1.0
  As  As16  1  0.876  0.625  0.000  1.0
  As  As17  1  0.124  0.375  0.000  1.0
[/CIF]
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The material structure described by Eu5As4 crystallizes in the orthorhombic Cmce space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to three equivalent As(1) and three equivalent As(2) atoms to form a mixture of distorted corner, edge, and face-sharing EuAs6 pentagonal pyramids. The corner-sharing octahedral tilt angles range from 38-43°. In the second Eu site, Eu(2) is bonded to two equivalent As(1) and four equivalent As(2) atoms to form a mixture of corner and face-sharing EuAs6 octahedra. The corner-sharing octahedral tilt angles are 53°. There are two inequivalent As sites. In the first As site, As(1) is bonded to one Eu(2) and six equivalent Eu(1) atoms to form a mixture of distorted corner and edge-sharing AsEu7 pentagonal bipyramids. In the second As site, As(2) is bonded in a 9-coordinate geometry to two equivalent Eu(2), six equivalent Eu(1), and one As(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Eu5As4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.015
_cell_length_b   8.053
_cell_length_c   8.673
_cell_angle_alpha   90.000
_cell_angle_beta   117.518
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   496.472
_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  0.189  0.165  0.717  1.0
  Eu  Eu1  1  0.529  0.835  0.717  1.0
  Eu  Eu2  1  0.029  0.665  0.717  1.0
  Eu  Eu3  1  0.689  0.335  0.717  1.0
  Eu  Eu4  1  0.811  0.835  0.283  1.0
  Eu  Eu5  1  0.471  0.165  0.283  1.0
  Eu  Eu6  1  0.971  0.335  0.283  1.0
  Eu  Eu7  1  0.311  0.665  0.283  1.0
  Eu  Eu8  1  0.500  0.500  0.000  1.0
  Eu  Eu9  1  0.000  0.000  0.000  1.0
  As  As10  1  0.300  0.500  0.600  1.0
  As  As11  1  0.800  0.000  0.600  1.0
  As  As12  1  0.700  0.500  0.400  1.0
  As  As13  1  0.200  0.000  0.400  1.0
  As  As14  1  0.624  0.125  0.000  1.0
  As  As15  1  0.376  0.875  0.000  1.0
  As  As16  1  0.876  0.625  0.000  1.0
  As  As17  1  0.124  0.375  0.000  1.0
[/CIF]
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