The structure described by Dy3FeGaSe7 crystallizes in the monoclinic P2_1 space group. There are three inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 7-coordinate geometry to one Se(1), one Se(4), one Se(5), one Se(6), one Se(7), and two equivalent Se(2) atoms. In the second Dy site, Dy(2) is bonded in a 7-coordinate geometry to one Se(2), one Se(4), one Se(5), one Se(6), one Se(7), and two equivalent Se(3) atoms. In the third Dy site, Dy(3) is bonded in a 7-coordinate geometry to one Se(3), one Se(4), one Se(5), one Se(6), one Se(7), and two equivalent Se(1) atoms. Fe(1) is bonded to two equivalent Se(5), two equivalent Se(6), and two equivalent Se(7) atoms to form face-sharing FeSe6 octahedra. Ga(1) is bonded in a tetrahedral geometry to one Se(1), one Se(2), one Se(3), and one Se(4) atom. There are seven inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted rectangular see-saw-like geometry to one Dy(1), two equivalent Dy(3), and one Ga(1) atom. In the second Se site, Se(2) is bonded in a distorted rectangular see-saw-like geometry to one Dy(2), two equivalent Dy(1), and one Ga(1) atom. In the third Se site, Se(3) is bonded in a distorted rectangular see-saw-like geometry to one Dy(3), two equivalent Dy(2), and one Ga(1) atom. In the fourth Se site, Se(4) is bonded to one Dy(1), one Dy(2), one Dy(3), and one Ga(1) atom to form corner-sharing SeDy3Ga tetrahedra. In the fifth Se site, Se(5) is bonded to one Dy(1), one Dy(2), one Dy(3), and two equivalent Fe(1) atoms to form distorted SeDy3Fe2 square pyramids that share corners with two equivalent Se(5)Dy3Fe2 square pyramids, corners with three equivalent Se(4)Dy3Ga tetrahedra, edges with two equivalent Se(6)Dy3Fe2 square pyramids, edges with two equivalent Se(7)Dy3Fe2 square pyramids,  a faceface with one Se(6)Dy3Fe2 square pyramid, and  a faceface with one Se(7)Dy3Fe2 square pyramid. In the sixth Se site, Se(6) is bonded to one Dy(1), one Dy(2), one Dy(3), and two equivalent Fe(1) atoms to form distorted SeDy3Fe2 square pyramids that share corners with two equivalent Se(6)Dy3Fe2 square pyramids, corners with three equivalent Se(4)Dy3Ga tetrahedra, edges with two equivalent Se(5)Dy3Fe2 square pyramids, edges with two equivalent Se(7)Dy3Fe2 square pyramids,  a faceface with one Se(5)Dy3Fe2 square pyramid, and  a faceface with one Se(7)Dy3Fe2 square pyramid. In the seventh Se site, Se(7) is bonded to one Dy(1), one Dy(2), one Dy(3), and two equivalent Fe(1) atoms to form distorted SeDy3Fe2 square pyramids that share corners with two equivalent Se(7)Dy3Fe2 square pyramids, corners with three equivalent Se(4)Dy3Ga tetrahedra, edges with two equivalent Se(5)Dy3Fe2 square pyramids, edges with two equivalent Se(6)Dy3Fe2 square pyramids,  a faceface with one Se(5)Dy3Fe2 square pyramid, and  a faceface with one Se(6)Dy3Fe2 square pyramid. is represented by the CIF file [CIF]
data_Dy3GaFeSe7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.418
_cell_length_b   9.966
_cell_length_c   9.971
_cell_angle_alpha   119.868
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   553.080
_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
  Dy  Dy0  1  0.821  0.157  0.785  1.0
  Dy  Dy1  1  0.822  0.215  0.372  1.0
  Dy  Dy2  1  0.822  0.628  0.842  1.0
  Dy  Dy3  1  0.321  0.843  0.215  1.0
  Dy  Dy4  1  0.322  0.785  0.628  1.0
  Dy  Dy5  1  0.322  0.372  0.158  1.0
  Ga  Ga6  1  0.898  0.667  0.333  1.0
  Ga  Ga7  1  0.398  0.333  0.667  1.0
  Fe  Fe8  1  0.493  0.000  1.000  1.0
  Fe  Fe9  1  0.993  1.000  0.000  1.0
  Se  Se10  1  0.553  0.438  0.920  1.0
  Se  Se11  1  0.553  0.080  0.519  1.0
  Se  Se12  1  0.554  0.482  0.562  1.0
  Se  Se13  1  0.053  0.562  0.080  1.0
  Se  Se14  1  0.053  0.920  0.481  1.0
  Se  Se15  1  0.054  0.518  0.438  1.0
  Se  Se16  1  0.524  0.667  0.333  1.0
  Se  Se17  1  0.024  0.333  0.667  1.0
  Se  Se18  1  0.737  0.870  0.769  1.0
  Se  Se19  1  0.737  0.230  0.100  1.0
  Se  Se20  1  0.737  0.900  0.129  1.0
  Se  Se21  1  0.237  0.130  0.231  1.0
  Se  Se22  1  0.237  0.770  0.900  1.0
  Se  Se23  1  0.237  0.100  0.871  1.0
[/CIF]
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The structure described by Dy3FeGaSe7 crystallizes in the monoclinic P2_1 space group. There are three inequivalent Dy sites. In the first Dy site, Dy(1) is bonded in a 7-coordinate geometry to one Se(1), one Se(4), one Se(5), one Se(6), one Se(7), and two equivalent Se(2) atoms. In the second Dy site, Dy(2) is bonded in a 7-coordinate geometry to one Se(2), one Se(4), one Se(5), one Se(6), one Se(7), and two equivalent Se(3) atoms. In the third Dy site, Dy(3) is bonded in a 7-coordinate geometry to one Se(3), one Se(4), one Se(5), one Se(6), one Se(7), and two equivalent Se(1) atoms. Fe(1) is bonded to two equivalent Se(5), two equivalent Se(6), and two equivalent Se(7) atoms to form face-sharing FeSe6 octahedra. Ga(1) is bonded in a tetrahedral geometry to one Se(1), one Se(2), one Se(3), and one Se(4) atom. There are seven inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted rectangular see-saw-like geometry to one Dy(1), two equivalent Dy(3), and one Ga(1) atom. In the second Se site, Se(2) is bonded in a distorted rectangular see-saw-like geometry to one Dy(2), two equivalent Dy(1), and one Ga(1) atom. In the third Se site, Se(3) is bonded in a distorted rectangular see-saw-like geometry to one Dy(3), two equivalent Dy(2), and one Ga(1) atom. In the fourth Se site, Se(4) is bonded to one Dy(1), one Dy(2), one Dy(3), and one Ga(1) atom to form corner-sharing SeDy3Ga tetrahedra. In the fifth Se site, Se(5) is bonded to one Dy(1), one Dy(2), one Dy(3), and two equivalent Fe(1) atoms to form distorted SeDy3Fe2 square pyramids that share corners with two equivalent Se(5)Dy3Fe2 square pyramids, corners with three equivalent Se(4)Dy3Ga tetrahedra, edges with two equivalent Se(6)Dy3Fe2 square pyramids, edges with two equivalent Se(7)Dy3Fe2 square pyramids,  a faceface with one Se(6)Dy3Fe2 square pyramid, and  a faceface with one Se(7)Dy3Fe2 square pyramid. In the sixth Se site, Se(6) is bonded to one Dy(1), one Dy(2), one Dy(3), and two equivalent Fe(1) atoms to form distorted SeDy3Fe2 square pyramids that share corners with two equivalent Se(6)Dy3Fe2 square pyramids, corners with three equivalent Se(4)Dy3Ga tetrahedra, edges with two equivalent Se(5)Dy3Fe2 square pyramids, edges with two equivalent Se(7)Dy3Fe2 square pyramids,  a faceface with one Se(5)Dy3Fe2 square pyramid, and  a faceface with one Se(7)Dy3Fe2 square pyramid. In the seventh Se site, Se(7) is bonded to one Dy(1), one Dy(2), one Dy(3), and two equivalent Fe(1) atoms to form distorted SeDy3Fe2 square pyramids that share corners with two equivalent Se(7)Dy3Fe2 square pyramids, corners with three equivalent Se(4)Dy3Ga tetrahedra, edges with two equivalent Se(5)Dy3Fe2 square pyramids, edges with two equivalent Se(6)Dy3Fe2 square pyramids,  a faceface with one Se(5)Dy3Fe2 square pyramid, and  a faceface with one Se(6)Dy3Fe2 square pyramid. is represented by the CIF file [CIF]
data_Dy3GaFeSe7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.418
_cell_length_b   9.966
_cell_length_c   9.971
_cell_angle_alpha   119.868
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   553.080
_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
  Dy  Dy0  1  0.821  0.157  0.785  1.0
  Dy  Dy1  1  0.822  0.215  0.372  1.0
  Dy  Dy2  1  0.822  0.628  0.842  1.0
  Dy  Dy3  1  0.321  0.843  0.215  1.0
  Dy  Dy4  1  0.322  0.785  0.628  1.0
  Dy  Dy5  1  0.322  0.372  0.158  1.0
  Ga  Ga6  1  0.898  0.667  0.333  1.0
  Ga  Ga7  1  0.398  0.333  0.667  1.0
  Fe  Fe8  1  0.493  0.000  1.000  1.0
  Fe  Fe9  1  0.993  1.000  0.000  1.0
  Se  Se10  1  0.553  0.438  0.920  1.0
  Se  Se11  1  0.553  0.080  0.519  1.0
  Se  Se12  1  0.554  0.482  0.562  1.0
  Se  Se13  1  0.053  0.562  0.080  1.0
  Se  Se14  1  0.053  0.920  0.481  1.0
  Se  Se15  1  0.054  0.518  0.438  1.0
  Se  Se16  1  0.524  0.667  0.333  1.0
  Se  Se17  1  0.024  0.333  0.667  1.0
  Se  Se18  1  0.737  0.870  0.769  1.0
  Se  Se19  1  0.737  0.230  0.100  1.0
  Se  Se20  1  0.737  0.900  0.129  1.0
  Se  Se21  1  0.237  0.130  0.231  1.0
  Se  Se22  1  0.237  0.770  0.900  1.0
  Se  Se23  1  0.237  0.100  0.871  1.0
[/CIF]
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