data_Eu2YAs
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.46
_cell_length_b   5.46
_cell_length_c   5.46
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Eu2YAs
_chemical_formula_sum   'Eu2 Y1 As1'
_cell_volume   115.07
_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  Eu1  1  0.79  0.79  0.79  1.0
  Eu  Eu2  1  0.93  0.93  0.93  1.0
  Y  Y3  1  0.86  0.86  0.86  1.0
  As  As0  1  0.0  0.0  0.0  1.0

data_Eu2YAs
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.46
_cell_length_b   5.46
_cell_length_c   13.37
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   Eu2YAs
_chemical_formula_sum   'Eu6 Y3 As3'
_cell_volume   345.22
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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  3  0.0  0.0  0.07  1.0
  Eu  Eu1  3  0.0  0.0  0.21  1.0
  Y  Y2  3  0.0  0.0  0.14  1.0
  As  As3  3  0.0  0.0  0.0  1.0

Eu Eu Y As
Eu2YAs crystallizes in the trigonal R3m space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to one Y(1) and three equivalent As(1) atoms to form distorted corner-sharing EuYAs3 tetrahedra. The Eu(1)-Y(1) bond length is 0.93 Å. All Eu(1)-As(1) bond lengths are 3.56 Å. In the second Eu site, Eu(2) is bonded in a distorted linear geometry to one Y(1) and one As(1) atom. The Eu(2)-Y(1) bond length is 0.93 Å. The Eu(2)-As(1) bond length is 0.93 Å. Y(1) is bonded in a linear geometry to one Eu(1) and one Eu(2) atom. As(1) is bonded in a single-bond geometry to one Eu(2) and three equivalent Eu(1) atoms.