The material described by MgEu2Se4 crystallizes in the tetragonal I-42d space group. Mg(1) is bonded in a square co-planar geometry to four equivalent Se(1) atoms. Eu(1) is bonded in a 8-coordinate geometry to eight equivalent Se(1) atoms. Se(1) is bonded to one Mg(1) and four equivalent Eu(1) atoms to form a mixture of distorted face, corner, and edge-sharing SeEu4Mg trigonal bipyramids. is represented by the CIF file [CIF]
data_Eu2MgSe4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.717
_cell_length_b   7.717
_cell_length_c   7.717
_cell_angle_alpha   112.319
_cell_angle_beta   112.319
_cell_angle_gamma   103.914
_symmetry_Int_Tables_number   1
_cell_volume   351.258
_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  0.875  0.750  0.375  1.0
  Eu  Eu1  1  0.500  0.125  0.875  1.0
  Eu  Eu2  1  0.375  0.500  0.625  1.0
  Eu  Eu3  1  0.250  0.625  0.125  1.0
  Mg  Mg4  1  0.000  0.000  0.000  1.0
  Mg  Mg5  1  0.750  0.250  0.500  1.0
  Se  Se6  1  0.510  0.386  0.277  1.0
  Se  Se7  1  0.767  0.490  0.876  1.0
  Se  Se8  1  0.109  0.233  0.723  1.0
  Se  Se9  1  0.614  0.891  0.124  1.0
  Se  Se10  1  0.240  0.017  0.376  1.0
  Se  Se11  1  0.983  0.359  0.223  1.0
  Se  Se12  1  0.641  0.864  0.624  1.0
  Se  Se13  1  0.136  0.760  0.777  1.0
[/CIF]
.
The material described by MgEu2Se4 crystallizes in the tetragonal I-42d space group. Mg(1) is bonded in a square co-planar geometry to four equivalent Se(1) atoms. Eu(1) is bonded in a 8-coordinate geometry to eight equivalent Se(1) atoms. Se(1) is bonded to one Mg(1) and four equivalent Eu(1) atoms to form a mixture of distorted face, corner, and edge-sharing SeEu4Mg trigonal bipyramids. is represented by the CIF file [CIF]
data_Eu2MgSe4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.717
_cell_length_b   7.717
_cell_length_c   7.717
_cell_angle_alpha   112.319
_cell_angle_beta   112.319
_cell_angle_gamma   103.914
_symmetry_Int_Tables_number   1
_cell_volume   351.258
_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  0.875  0.750  0.375  1.0
  Eu  Eu1  1  0.500  0.125  0.875  1.0
  Eu  Eu2  1  0.375  0.500  0.625  1.0
  Eu  Eu3  1  0.250  0.625  0.125  1.0
  Mg  Mg4  1  0.000  0.000  0.000  1.0
  Mg  Mg5  1  0.750  0.250  0.500  1.0
  Se  Se6  1  0.510  0.386  0.277  1.0
  Se  Se7  1  0.767  0.490  0.876  1.0
  Se  Se8  1  0.109  0.233  0.723  1.0
  Se  Se9  1  0.614  0.891  0.124  1.0
  Se  Se10  1  0.240  0.017  0.376  1.0
  Se  Se11  1  0.983  0.359  0.223  1.0
  Se  Se12  1  0.641  0.864  0.624  1.0
  Se  Se13  1  0.136  0.760  0.777  1.0
[/CIF]
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