The compound described by Eu2Zn2As3 crystallizes in the monoclinic C2/m space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to one As(2), two equivalent As(1), and three equivalent As(3) atoms to form EuAs6 octahedra that share corners with three equivalent Zn(1)Eu2As4 tetrahedra, corners with four equivalent Zn(2)EuAs4 tetrahedra, edges with four equivalent Eu(1)As6 octahedra, edges with two equivalent Zn(2)EuAs4 tetrahedra, and edges with three equivalent Zn(1)Eu2As4 tetrahedra. In the second Eu site, Eu(2) is bonded in a 10-coordinate geometry to one Zn(2), two equivalent Zn(1), three equivalent As(2), and four equivalent As(1) atoms. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to two equivalent Eu(2), one As(1), one As(2), and two equivalent As(3) atoms to form distorted ZnEu2As4 tetrahedra that share corners with three equivalent Eu(1)As6 octahedra, corners with two equivalent Zn(2)EuAs4 tetrahedra, edges with three equivalent Eu(1)As6 octahedra, edges with two equivalent Zn(1)Eu2As4 tetrahedra, and faces with two equivalent Zn(2)EuAs4 tetrahedra. The corner-sharing octahedral tilt angles range from 19-52°. In the second Zn site, Zn(2) is bonded to one Eu(2), two equivalent As(2), and two equivalent As(3) atoms to form distorted ZnEuAs4 tetrahedra that share corners with four equivalent Eu(1)As6 octahedra, corners with two equivalent Zn(1)Eu2As4 tetrahedra, corners with two equivalent Zn(2)EuAs4 tetrahedra, edges with two equivalent Eu(1)As6 octahedra,  an edgeedge with one Zn(2)EuAs4 tetrahedra, and faces with two equivalent Zn(1)Eu2As4 tetrahedra. The corner-sharing octahedral tilt angles range from 23-56°. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to two equivalent Eu(1), four equivalent Eu(2), one Zn(1), and one As(1) atom. In the second As site, As(2) is bonded in a 7-coordinate geometry to one Eu(1), three equivalent Eu(2), one Zn(1), and two equivalent Zn(2) atoms. In the third As site, As(3) is bonded to three equivalent Eu(1), two equivalent Zn(1), and two equivalent Zn(2) atoms to form distorted edge-sharing AsEu3Zn4 pentagonal bipyramids. is represented by the CIF card [CIF]
data_Eu2Zn2As3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.304
_cell_length_b   8.304
_cell_length_c   11.943
_cell_angle_alpha   54.985
_cell_angle_beta   54.985
_cell_angle_gamma   29.869
_symmetry_Int_Tables_number   1
_cell_volume   329.970
_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  0.267  0.267  0.336  1.0
  Eu  Eu1  1  0.733  0.733  0.664  1.0
  Eu  Eu2  1  0.395  0.395  0.949  1.0
  Eu  Eu3  1  0.605  0.605  0.051  1.0
  Zn  Zn4  1  0.041  0.041  0.686  1.0
  Zn  Zn5  1  0.959  0.959  0.314  1.0
  Zn  Zn6  1  0.410  0.410  0.653  1.0
  Zn  Zn7  1  0.590  0.590  0.347  1.0
  As  As8  1  0.080  0.080  0.872  1.0
  As  As9  1  0.920  0.920  0.128  1.0
  As  As10  1  0.156  0.156  0.196  1.0
  As  As11  1  0.844  0.844  0.804  1.0
  As  As12  1  0.386  0.386  0.461  1.0
  As  As13  1  0.614  0.614  0.539  1.0
[/CIF]
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The compound described by Eu2Zn2As3 crystallizes in the monoclinic C2/m space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to one As(2), two equivalent As(1), and three equivalent As(3) atoms to form EuAs6 octahedra that share corners with three equivalent Zn(1)Eu2As4 tetrahedra, corners with four equivalent Zn(2)EuAs4 tetrahedra, edges with four equivalent Eu(1)As6 octahedra, edges with two equivalent Zn(2)EuAs4 tetrahedra, and edges with three equivalent Zn(1)Eu2As4 tetrahedra. In the second Eu site, Eu(2) is bonded in a 10-coordinate geometry to one Zn(2), two equivalent Zn(1), three equivalent As(2), and four equivalent As(1) atoms. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to two equivalent Eu(2), one As(1), one As(2), and two equivalent As(3) atoms to form distorted ZnEu2As4 tetrahedra that share corners with three equivalent Eu(1)As6 octahedra, corners with two equivalent Zn(2)EuAs4 tetrahedra, edges with three equivalent Eu(1)As6 octahedra, edges with two equivalent Zn(1)Eu2As4 tetrahedra, and faces with two equivalent Zn(2)EuAs4 tetrahedra. The corner-sharing octahedral tilt angles range from 19-52°. In the second Zn site, Zn(2) is bonded to one Eu(2), two equivalent As(2), and two equivalent As(3) atoms to form distorted ZnEuAs4 tetrahedra that share corners with four equivalent Eu(1)As6 octahedra, corners with two equivalent Zn(1)Eu2As4 tetrahedra, corners with two equivalent Zn(2)EuAs4 tetrahedra, edges with two equivalent Eu(1)As6 octahedra,  an edgeedge with one Zn(2)EuAs4 tetrahedra, and faces with two equivalent Zn(1)Eu2As4 tetrahedra. The corner-sharing octahedral tilt angles range from 23-56°. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to two equivalent Eu(1), four equivalent Eu(2), one Zn(1), and one As(1) atom. In the second As site, As(2) is bonded in a 7-coordinate geometry to one Eu(1), three equivalent Eu(2), one Zn(1), and two equivalent Zn(2) atoms. In the third As site, As(3) is bonded to three equivalent Eu(1), two equivalent Zn(1), and two equivalent Zn(2) atoms to form distorted edge-sharing AsEu3Zn4 pentagonal bipyramids. is represented by the CIF card [CIF]
data_Eu2Zn2As3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.304
_cell_length_b   8.304
_cell_length_c   11.943
_cell_angle_alpha   54.985
_cell_angle_beta   54.985
_cell_angle_gamma   29.869
_symmetry_Int_Tables_number   1
_cell_volume   329.970
_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  0.267  0.267  0.336  1.0
  Eu  Eu1  1  0.733  0.733  0.664  1.0
  Eu  Eu2  1  0.395  0.395  0.949  1.0
  Eu  Eu3  1  0.605  0.605  0.051  1.0
  Zn  Zn4  1  0.041  0.041  0.686  1.0
  Zn  Zn5  1  0.959  0.959  0.314  1.0
  Zn  Zn6  1  0.410  0.410  0.653  1.0
  Zn  Zn7  1  0.590  0.590  0.347  1.0
  As  As8  1  0.080  0.080  0.872  1.0
  As  As9  1  0.920  0.920  0.128  1.0
  As  As10  1  0.156  0.156  0.196  1.0
  As  As11  1  0.844  0.844  0.804  1.0
  As  As12  1  0.386  0.386  0.461  1.0
  As  As13  1  0.614  0.614  0.539  1.0
[/CIF]
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