The structure described by EuAs crystallizes in the monoclinic Pm space group. There are six inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 6-coordinate geometry to two equivalent As(1), two equivalent As(2), and two equivalent As(3) atoms. In the second Eu site, Eu(2) is bonded in a 6-coordinate geometry to two equivalent As(1), two equivalent As(2), and two equivalent As(3) atoms. In the third Eu site, Eu(3) is bonded in a 6-coordinate geometry to two equivalent As(1), two equivalent As(2), and two equivalent As(3) atoms. In the fourth Eu site, Eu(4) is bonded in a 6-coordinate geometry to two equivalent As(1), two equivalent As(2), and two equivalent As(3) atoms. In the fifth Eu site, Eu(5) is bonded in a 6-coordinate geometry to two equivalent As(1), two equivalent As(2), and two equivalent As(3) atoms. In the sixth Eu site, Eu(6) is bonded in a 6-coordinate geometry to two equivalent As(1), two equivalent As(2), and two equivalent As(3) atoms. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 7-coordinate geometry to one Eu(1), one Eu(2), one Eu(3), one Eu(4), one Eu(5), one Eu(6), and one As(1) atom. In the second As site, As(2) is bonded to one Eu(1), one Eu(2), one Eu(3), one Eu(4), one Eu(5), and one Eu(6) atom to form distorted AsEu6 octahedra that share corners with six equivalent As(3)Eu6As octahedra, edges with three equivalent As(3)Eu6As octahedra, and faces with two equivalent As(2)Eu6 octahedra. The corner-sharing octahedral tilt angles range from 44-56°. In the third As site, As(3) is bonded to one Eu(1), one Eu(2), one Eu(3), one Eu(4), one Eu(5), one Eu(6), and one As(3) atom to form distorted AsEu6As octahedra that share corners with six equivalent As(2)Eu6 octahedra, edges with three equivalent As(2)Eu6 octahedra, and faces with two equivalent As(3)Eu6As octahedra. The corner-sharing octahedral tilt angles range from 44-56°. is represented by the CIF file [CIF]
data_EuAs
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.293
_cell_length_b   7.924
_cell_length_c   7.927
_cell_angle_alpha   120.012
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   342.241
_cell_formula_units_Z   6
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  1.000  0.320  0.999  1.0
  Eu  Eu1  1  1.000  0.681  0.681  1.0
  Eu  Eu2  1  1.000  0.001  0.320  1.0
  Eu  Eu3  1  0.500  0.647  0.001  1.0
  Eu  Eu4  1  0.500  0.352  0.353  1.0
  Eu  Eu5  1  0.500  0.999  0.647  1.0
  As  As6  1  0.293  0.000  0.000  1.0
  As  As7  1  0.707  0.000  0.000  1.0
  As  As8  1  0.231  0.333  0.667  1.0
  As  As9  1  0.769  0.333  0.667  1.0
  As  As10  1  0.228  0.667  0.333  1.0
  As  As11  1  0.772  0.667  0.333  1.0
[/CIF]
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The structure described by EuAs crystallizes in the monoclinic Pm space group. There are six inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 6-coordinate geometry to two equivalent As(1), two equivalent As(2), and two equivalent As(3) atoms. In the second Eu site, Eu(2) is bonded in a 6-coordinate geometry to two equivalent As(1), two equivalent As(2), and two equivalent As(3) atoms. In the third Eu site, Eu(3) is bonded in a 6-coordinate geometry to two equivalent As(1), two equivalent As(2), and two equivalent As(3) atoms. In the fourth Eu site, Eu(4) is bonded in a 6-coordinate geometry to two equivalent As(1), two equivalent As(2), and two equivalent As(3) atoms. In the fifth Eu site, Eu(5) is bonded in a 6-coordinate geometry to two equivalent As(1), two equivalent As(2), and two equivalent As(3) atoms. In the sixth Eu site, Eu(6) is bonded in a 6-coordinate geometry to two equivalent As(1), two equivalent As(2), and two equivalent As(3) atoms. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 7-coordinate geometry to one Eu(1), one Eu(2), one Eu(3), one Eu(4), one Eu(5), one Eu(6), and one As(1) atom. In the second As site, As(2) is bonded to one Eu(1), one Eu(2), one Eu(3), one Eu(4), one Eu(5), and one Eu(6) atom to form distorted AsEu6 octahedra that share corners with six equivalent As(3)Eu6As octahedra, edges with three equivalent As(3)Eu6As octahedra, and faces with two equivalent As(2)Eu6 octahedra. The corner-sharing octahedral tilt angles range from 44-56°. In the third As site, As(3) is bonded to one Eu(1), one Eu(2), one Eu(3), one Eu(4), one Eu(5), one Eu(6), and one As(3) atom to form distorted AsEu6As octahedra that share corners with six equivalent As(2)Eu6 octahedra, edges with three equivalent As(2)Eu6 octahedra, and faces with two equivalent As(3)Eu6As octahedra. The corner-sharing octahedral tilt angles range from 44-56°. is represented by the CIF file [CIF]
data_EuAs
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.293
_cell_length_b   7.924
_cell_length_c   7.927
_cell_angle_alpha   120.012
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   342.241
_cell_formula_units_Z   6
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  1.000  0.320  0.999  1.0
  Eu  Eu1  1  1.000  0.681  0.681  1.0
  Eu  Eu2  1  1.000  0.001  0.320  1.0
  Eu  Eu3  1  0.500  0.647  0.001  1.0
  Eu  Eu4  1  0.500  0.352  0.353  1.0
  Eu  Eu5  1  0.500  0.999  0.647  1.0
  As  As6  1  0.293  0.000  0.000  1.0
  As  As7  1  0.707  0.000  0.000  1.0
  As  As8  1  0.231  0.333  0.667  1.0
  As  As9  1  0.769  0.333  0.667  1.0
  As  As10  1  0.228  0.667  0.333  1.0
  As  As11  1  0.772  0.667  0.333  1.0
[/CIF]
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