The compound described by MgEu2Se4 is Spinel structured and crystallizes in the cubic Fd-3m space group. Mg(1) is bonded to four equivalent Se(1) atoms to form MgSe4 tetrahedra that share corners with twelve equivalent Eu(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 56°. Eu(1) is bonded to six equivalent Se(1) atoms to form EuSe6 octahedra that share corners with six equivalent Mg(1)Se4 tetrahedra and edges with six equivalent Eu(1)Se6 octahedra. Se(1) is bonded in a rectangular see-saw-like geometry to one Mg(1) and three equivalent Eu(1) atoms. is represented by the CIF card [CIF]
data_Eu2MgSe4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.457
_cell_length_b   8.457
_cell_length_c   8.457
_cell_angle_alpha   90.002
_cell_angle_beta   119.999
_cell_angle_gamma   119.999
_symmetry_Int_Tables_number   1
_cell_volume   427.689
_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  0.750  0.625  0.375  1.0
  Eu  Eu1  1  0.250  0.625  0.875  1.0
  Eu  Eu2  1  0.750  0.125  0.375  1.0
  Eu  Eu3  1  0.250  0.625  0.375  1.0
  Mg  Mg4  1  0.000  0.000  0.000  1.0
  Mg  Mg5  1  0.500  0.250  0.750  1.0
  Se  Se6  1  0.755  0.377  0.623  1.0
  Se  Se7  1  0.245  0.868  0.623  1.0
  Se  Se8  1  0.245  0.377  0.623  1.0
  Se  Se9  1  0.755  0.377  0.132  1.0
  Se  Se10  1  0.745  0.873  0.618  1.0
  Se  Se11  1  0.255  0.873  0.127  1.0
  Se  Se12  1  0.255  0.382  0.127  1.0
  Se  Se13  1  0.745  0.873  0.127  1.0
[/CIF]
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The compound described by MgEu2Se4 is Spinel structured and crystallizes in the cubic Fd-3m space group. Mg(1) is bonded to four equivalent Se(1) atoms to form MgSe4 tetrahedra that share corners with twelve equivalent Eu(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 56°. Eu(1) is bonded to six equivalent Se(1) atoms to form EuSe6 octahedra that share corners with six equivalent Mg(1)Se4 tetrahedra and edges with six equivalent Eu(1)Se6 octahedra. Se(1) is bonded in a rectangular see-saw-like geometry to one Mg(1) and three equivalent Eu(1) atoms. is represented by the CIF card [CIF]
data_Eu2MgSe4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.457
_cell_length_b   8.457
_cell_length_c   8.457
_cell_angle_alpha   90.002
_cell_angle_beta   119.999
_cell_angle_gamma   119.999
_symmetry_Int_Tables_number   1
_cell_volume   427.689
_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  0.750  0.625  0.375  1.0
  Eu  Eu1  1  0.250  0.625  0.875  1.0
  Eu  Eu2  1  0.750  0.125  0.375  1.0
  Eu  Eu3  1  0.250  0.625  0.375  1.0
  Mg  Mg4  1  0.000  0.000  0.000  1.0
  Mg  Mg5  1  0.500  0.250  0.750  1.0
  Se  Se6  1  0.755  0.377  0.623  1.0
  Se  Se7  1  0.245  0.868  0.623  1.0
  Se  Se8  1  0.245  0.377  0.623  1.0
  Se  Se9  1  0.755  0.377  0.132  1.0
  Se  Se10  1  0.745  0.873  0.618  1.0
  Se  Se11  1  0.255  0.873  0.127  1.0
  Se  Se12  1  0.255  0.382  0.127  1.0
  Se  Se13  1  0.745  0.873  0.127  1.0
[/CIF]
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