The material structure described by Eu2As3 is Magnesium tetraboride-like structured and crystallizes in the monoclinic P2/c space group. There are five inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 8-coordinate geometry to two equivalent As(1), two equivalent As(2), and four equivalent As(4) atoms. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to one As(3), one As(4), one As(5), two equivalent As(6), and three equivalent As(2) atoms. In the third Eu site, Eu(3) is bonded in a 9-coordinate geometry to one As(2), one As(3), one As(5), two equivalent As(1), two equivalent As(4), and two equivalent As(6) atoms. In the fourth Eu site, Eu(4) is bonded in a 8-coordinate geometry to two equivalent As(1), two equivalent As(3), two equivalent As(6), and four equivalent As(5) atoms. In the fifth Eu site, Eu(5) is bonded to one As(2), one As(4), one As(5), two equivalent As(1), and three equivalent As(3) atoms to form a mixture of distorted edge, corner, and face-sharing EuAs8 hexagonal bipyramids. There are six inequivalent As sites. In the first As site, As(5) is bonded in a 7-coordinate geometry to one Eu(2), one Eu(3), one Eu(5), two equivalent Eu(4), one As(5), and one As(6) atom. In the second As site, As(6) is bonded in a 7-coordinate geometry to one Eu(4), two equivalent Eu(2), two equivalent Eu(3), one As(1), and one As(5) atom. In the third As site, As(1) is bonded in a 8-coordinate geometry to one Eu(1), one Eu(4), two equivalent Eu(3), two equivalent Eu(5), one As(3), and one As(6) atom. In the fourth As site, As(2) is bonded in a 7-coordinate geometry to one Eu(1), one Eu(3), one Eu(5), three equivalent Eu(2), and one As(4) atom. In the fifth As site, As(3) is bonded in a 7-coordinate geometry to one Eu(2), one Eu(3), one Eu(4), three equivalent Eu(5), and one As(1) atom. In the sixth As site, As(4) is bonded in a 8-coordinate geometry to one Eu(2), one Eu(5), two equivalent Eu(1), two equivalent Eu(3), one As(2), and one As(4) atom. is represented by the CIF file [CIF]
data_Eu2As3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.997
_cell_length_b   12.368
_cell_length_c   18.726
_cell_angle_alpha   49.328
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1053.480
_cell_formula_units_Z   8
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  0.966  0.000  0.250  1.0
  Eu  Eu1  1  0.034  0.000  0.750  1.0
  Eu  Eu2  1  0.754  0.625  0.000  1.0
  Eu  Eu3  1  0.246  0.375  1.000  1.0
  Eu  Eu4  1  0.754  0.375  0.500  1.0
  Eu  Eu5  1  0.246  0.625  0.500  1.0
  Eu  Eu6  1  0.545  0.761  0.249  1.0
  Eu  Eu7  1  0.455  0.239  0.751  1.0
  Eu  Eu8  1  0.545  0.239  0.251  1.0
  Eu  Eu9  1  0.455  0.761  0.749  1.0
  Eu  Eu10  1  0.916  0.500  0.250  1.0
  Eu  Eu11  1  0.084  0.500  0.750  1.0
  Eu  Eu12  1  0.740  0.866  0.509  1.0
  Eu  Eu13  1  0.260  0.134  0.491  1.0
  Eu  Eu14  1  0.740  0.134  0.991  1.0
  Eu  Eu15  1  0.260  0.866  0.009  1.0
  As  As16  1  0.956  0.840  0.671  1.0
  As  As17  1  0.044  0.160  0.329  1.0
  As  As18  1  0.956  0.160  0.829  1.0
  As  As19  1  0.044  0.840  0.171  1.0
  As  As20  1  0.735  0.714  0.421  1.0
  As  As21  1  0.265  0.286  0.579  1.0
  As  As22  1  0.735  0.286  0.079  1.0
  As  As23  1  0.265  0.714  0.921  1.0
  As  As24  1  0.773  0.811  0.078  1.0
  As  As25  1  0.227  0.189  0.922  1.0
  As  As26  1  0.773  0.189  0.422  1.0
  As  As27  1  0.227  0.811  0.578  1.0
  As  As28  1  0.459  0.923  0.341  1.0
  As  As29  1  0.541  0.077  0.659  1.0
  As  As30  1  0.459  0.077  0.159  1.0
  As  As31  1  0.541  0.923  0.841  1.0
  As  As32  1  0.396  0.545  0.167  1.0
  As  As33  1  0.604  0.455  0.833  1.0
  As  As34  1  0.396  0.455  0.333  1.0
  As  As35  1  0.604  0.545  0.667  1.0
  As  As36  1  0.904  0.392  0.656  1.0
  As  As37  1  0.096  0.608  0.344  1.0
  As  As38  1  0.904  0.608  0.844  1.0
  As  As39  1  0.096  0.392  0.156  1.0
[/CIF]
.
The material structure described by Eu2As3 is Magnesium tetraboride-like structured and crystallizes in the monoclinic P2/c space group. There are five inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 8-coordinate geometry to two equivalent As(1), two equivalent As(2), and four equivalent As(4) atoms. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to one As(3), one As(4), one As(5), two equivalent As(6), and three equivalent As(2) atoms. In the third Eu site, Eu(3) is bonded in a 9-coordinate geometry to one As(2), one As(3), one As(5), two equivalent As(1), two equivalent As(4), and two equivalent As(6) atoms. In the fourth Eu site, Eu(4) is bonded in a 8-coordinate geometry to two equivalent As(1), two equivalent As(3), two equivalent As(6), and four equivalent As(5) atoms. In the fifth Eu site, Eu(5) is bonded to one As(2), one As(4), one As(5), two equivalent As(1), and three equivalent As(3) atoms to form a mixture of distorted edge, corner, and face-sharing EuAs8 hexagonal bipyramids. There are six inequivalent As sites. In the first As site, As(5) is bonded in a 7-coordinate geometry to one Eu(2), one Eu(3), one Eu(5), two equivalent Eu(4), one As(5), and one As(6) atom. In the second As site, As(6) is bonded in a 7-coordinate geometry to one Eu(4), two equivalent Eu(2), two equivalent Eu(3), one As(1), and one As(5) atom. In the third As site, As(1) is bonded in a 8-coordinate geometry to one Eu(1), one Eu(4), two equivalent Eu(3), two equivalent Eu(5), one As(3), and one As(6) atom. In the fourth As site, As(2) is bonded in a 7-coordinate geometry to one Eu(1), one Eu(3), one Eu(5), three equivalent Eu(2), and one As(4) atom. In the fifth As site, As(3) is bonded in a 7-coordinate geometry to one Eu(2), one Eu(3), one Eu(4), three equivalent Eu(5), and one As(1) atom. In the sixth As site, As(4) is bonded in a 8-coordinate geometry to one Eu(2), one Eu(5), two equivalent Eu(1), two equivalent Eu(3), one As(2), and one As(4) atom. is represented by the CIF file [CIF]
data_Eu2As3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.997
_cell_length_b   12.368
_cell_length_c   18.726
_cell_angle_alpha   49.328
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1053.480
_cell_formula_units_Z   8
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  0.966  0.000  0.250  1.0
  Eu  Eu1  1  0.034  0.000  0.750  1.0
  Eu  Eu2  1  0.754  0.625  0.000  1.0
  Eu  Eu3  1  0.246  0.375  1.000  1.0
  Eu  Eu4  1  0.754  0.375  0.500  1.0
  Eu  Eu5  1  0.246  0.625  0.500  1.0
  Eu  Eu6  1  0.545  0.761  0.249  1.0
  Eu  Eu7  1  0.455  0.239  0.751  1.0
  Eu  Eu8  1  0.545  0.239  0.251  1.0
  Eu  Eu9  1  0.455  0.761  0.749  1.0
  Eu  Eu10  1  0.916  0.500  0.250  1.0
  Eu  Eu11  1  0.084  0.500  0.750  1.0
  Eu  Eu12  1  0.740  0.866  0.509  1.0
  Eu  Eu13  1  0.260  0.134  0.491  1.0
  Eu  Eu14  1  0.740  0.134  0.991  1.0
  Eu  Eu15  1  0.260  0.866  0.009  1.0
  As  As16  1  0.956  0.840  0.671  1.0
  As  As17  1  0.044  0.160  0.329  1.0
  As  As18  1  0.956  0.160  0.829  1.0
  As  As19  1  0.044  0.840  0.171  1.0
  As  As20  1  0.735  0.714  0.421  1.0
  As  As21  1  0.265  0.286  0.579  1.0
  As  As22  1  0.735  0.286  0.079  1.0
  As  As23  1  0.265  0.714  0.921  1.0
  As  As24  1  0.773  0.811  0.078  1.0
  As  As25  1  0.227  0.189  0.922  1.0
  As  As26  1  0.773  0.189  0.422  1.0
  As  As27  1  0.227  0.811  0.578  1.0
  As  As28  1  0.459  0.923  0.341  1.0
  As  As29  1  0.541  0.077  0.659  1.0
  As  As30  1  0.459  0.077  0.159  1.0
  As  As31  1  0.541  0.923  0.841  1.0
  As  As32  1  0.396  0.545  0.167  1.0
  As  As33  1  0.604  0.455  0.833  1.0
  As  As34  1  0.396  0.455  0.333  1.0
  As  As35  1  0.604  0.545  0.667  1.0
  As  As36  1  0.904  0.392  0.656  1.0
  As  As37  1  0.096  0.608  0.344  1.0
  As  As38  1  0.904  0.608  0.844  1.0
  As  As39  1  0.096  0.392  0.156  1.0
[/CIF]
.