The structure described by Eu3Ga2As4 crystallizes in the monoclinic C2/c space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 6-coordinate geometry to two equivalent As(2) and four equivalent As(1) atoms. In the second Eu site, Eu(2) is bonded to two equivalent As(1) and four equivalent As(2) atoms to form distorted EuAs6 octahedra that share corners with four equivalent Ga(1)As4 tetrahedra, edges with two equivalent Eu(2)As6 octahedra, and edges with four equivalent Ga(1)As4 tetrahedra. Ga(1) is bonded to two equivalent As(1) and two equivalent As(2) atoms to form distorted GaAs4 tetrahedra that share corners with two equivalent Eu(2)As6 octahedra, corners with two equivalent Ga(1)As4 tetrahedra, edges with two equivalent Eu(2)As6 octahedra, and  an edgeedge with one Ga(1)As4 tetrahedra. The corner-sharing octahedral tilt angles range from 29-58°. There are two inequivalent As sites. In the first As site, As(1) is bonded to one Eu(2), four equivalent Eu(1), and two equivalent Ga(1) atoms to form distorted AsEu5Ga2 pentagonal bipyramids that share corners with two equivalent As(1)Eu5Ga2 pentagonal bipyramids, corners with four equivalent As(2)Eu4Ga2 pentagonal pyramids, edges with five equivalent As(1)Eu5Ga2 pentagonal bipyramids, edges with six equivalent As(2)Eu4Ga2 pentagonal pyramids, and  a faceface with one As(1)Eu5Ga2 pentagonal bipyramid. In the second As site, As(2) is bonded to two equivalent Eu(1), two equivalent Eu(2), and two equivalent Ga(1) atoms to form distorted AsEu4Ga2 pentagonal pyramids that share corners with four equivalent As(1)Eu5Ga2 pentagonal bipyramids, corners with two equivalent As(2)Eu4Ga2 pentagonal pyramids, edges with six equivalent As(1)Eu5Ga2 pentagonal bipyramids, and edges with four equivalent As(2)Eu4Ga2 pentagonal pyramids. is represented by the CIF card [CIF]
data_Eu3(GaAs2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.504
_cell_length_b   8.504
_cell_length_c   6.775
_cell_angle_alpha   89.085
_cell_angle_beta   89.085
_cell_angle_gamma   76.187
_symmetry_Int_Tables_number   1
_cell_volume   475.701
_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  0.997  0.248  0.031  1.0
  Eu  Eu1  1  0.752  0.003  0.469  1.0
  Eu  Eu2  1  0.003  0.752  0.969  1.0
  Eu  Eu3  1  0.248  0.997  0.531  1.0
  Eu  Eu4  1  0.600  0.400  0.750  1.0
  Eu  Eu5  1  0.400  0.600  0.250  1.0
  Ga  Ga6  1  0.175  0.418  0.584  1.0
  Ga  Ga7  1  0.582  0.825  0.916  1.0
  Ga  Ga8  1  0.825  0.582  0.416  1.0
  Ga  Ga9  1  0.418  0.175  0.084  1.0
  As  As10  1  0.939  0.285  0.525  1.0
  As  As11  1  0.715  0.061  0.975  1.0
  As  As12  1  0.061  0.715  0.475  1.0
  As  As13  1  0.285  0.939  0.025  1.0
  As  As14  1  0.257  0.435  0.933  1.0
  As  As15  1  0.565  0.743  0.567  1.0
  As  As16  1  0.743  0.565  0.067  1.0
  As  As17  1  0.435  0.257  0.433  1.0
[/CIF]
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The structure described by Eu3Ga2As4 crystallizes in the monoclinic C2/c space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 6-coordinate geometry to two equivalent As(2) and four equivalent As(1) atoms. In the second Eu site, Eu(2) is bonded to two equivalent As(1) and four equivalent As(2) atoms to form distorted EuAs6 octahedra that share corners with four equivalent Ga(1)As4 tetrahedra, edges with two equivalent Eu(2)As6 octahedra, and edges with four equivalent Ga(1)As4 tetrahedra. Ga(1) is bonded to two equivalent As(1) and two equivalent As(2) atoms to form distorted GaAs4 tetrahedra that share corners with two equivalent Eu(2)As6 octahedra, corners with two equivalent Ga(1)As4 tetrahedra, edges with two equivalent Eu(2)As6 octahedra, and  an edgeedge with one Ga(1)As4 tetrahedra. The corner-sharing octahedral tilt angles range from 29-58°. There are two inequivalent As sites. In the first As site, As(1) is bonded to one Eu(2), four equivalent Eu(1), and two equivalent Ga(1) atoms to form distorted AsEu5Ga2 pentagonal bipyramids that share corners with two equivalent As(1)Eu5Ga2 pentagonal bipyramids, corners with four equivalent As(2)Eu4Ga2 pentagonal pyramids, edges with five equivalent As(1)Eu5Ga2 pentagonal bipyramids, edges with six equivalent As(2)Eu4Ga2 pentagonal pyramids, and  a faceface with one As(1)Eu5Ga2 pentagonal bipyramid. In the second As site, As(2) is bonded to two equivalent Eu(1), two equivalent Eu(2), and two equivalent Ga(1) atoms to form distorted AsEu4Ga2 pentagonal pyramids that share corners with four equivalent As(1)Eu5Ga2 pentagonal bipyramids, corners with two equivalent As(2)Eu4Ga2 pentagonal pyramids, edges with six equivalent As(1)Eu5Ga2 pentagonal bipyramids, and edges with four equivalent As(2)Eu4Ga2 pentagonal pyramids. is represented by the CIF card [CIF]
data_Eu3(GaAs2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.504
_cell_length_b   8.504
_cell_length_c   6.775
_cell_angle_alpha   89.085
_cell_angle_beta   89.085
_cell_angle_gamma   76.187
_symmetry_Int_Tables_number   1
_cell_volume   475.701
_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  0.997  0.248  0.031  1.0
  Eu  Eu1  1  0.752  0.003  0.469  1.0
  Eu  Eu2  1  0.003  0.752  0.969  1.0
  Eu  Eu3  1  0.248  0.997  0.531  1.0
  Eu  Eu4  1  0.600  0.400  0.750  1.0
  Eu  Eu5  1  0.400  0.600  0.250  1.0
  Ga  Ga6  1  0.175  0.418  0.584  1.0
  Ga  Ga7  1  0.582  0.825  0.916  1.0
  Ga  Ga8  1  0.825  0.582  0.416  1.0
  Ga  Ga9  1  0.418  0.175  0.084  1.0
  As  As10  1  0.939  0.285  0.525  1.0
  As  As11  1  0.715  0.061  0.975  1.0
  As  As12  1  0.061  0.715  0.475  1.0
  As  As13  1  0.285  0.939  0.025  1.0
  As  As14  1  0.257  0.435  0.933  1.0
  As  As15  1  0.565  0.743  0.567  1.0
  As  As16  1  0.743  0.565  0.067  1.0
  As  As17  1  0.435  0.257  0.433  1.0
[/CIF]
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