The material structure described by MgTb2Se4 crystallizes in the tetragonal I-42d space group. Mg(1) is bonded in a 4-coordinate geometry to eight equivalent Se(1) atoms. Tb(1) is bonded in a 8-coordinate geometry to eight equivalent Se(1) atoms. Se(1) is bonded in a 6-coordinate geometry to two equivalent Mg(1) and four equivalent Tb(1) atoms. is represented by the CIF file [CIF]
data_Tb2MgSe4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.554
_cell_length_b   7.554
_cell_length_c   7.554
_cell_angle_alpha   110.582
_cell_angle_beta   110.582
_cell_angle_gamma   107.272
_symmetry_Int_Tables_number   1
_cell_volume   331.440
_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
  Tb  Tb0  1  0.875  0.757  0.382  1.0
  Tb  Tb1  1  0.507  0.125  0.882  1.0
  Tb  Tb2  1  0.375  0.493  0.618  1.0
  Tb  Tb3  1  0.243  0.625  0.118  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  0.507  0.378  0.263  1.0
  Se  Se7  1  0.756  0.493  0.871  1.0
  Se  Se8  1  0.115  0.244  0.737  1.0
  Se  Se9  1  0.622  0.885  0.129  1.0
  Se  Se10  1  0.243  0.006  0.371  1.0
  Se  Se11  1  0.994  0.365  0.237  1.0
  Se  Se12  1  0.635  0.872  0.629  1.0
  Se  Se13  1  0.128  0.757  0.763  1.0
[/CIF]
.
The material structure described by MgTb2Se4 crystallizes in the tetragonal I-42d space group. Mg(1) is bonded in a 4-coordinate geometry to eight equivalent Se(1) atoms. Tb(1) is bonded in a 8-coordinate geometry to eight equivalent Se(1) atoms. Se(1) is bonded in a 6-coordinate geometry to two equivalent Mg(1) and four equivalent Tb(1) atoms. is represented by the CIF file [CIF]
data_Tb2MgSe4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.554
_cell_length_b   7.554
_cell_length_c   7.554
_cell_angle_alpha   110.582
_cell_angle_beta   110.582
_cell_angle_gamma   107.272
_symmetry_Int_Tables_number   1
_cell_volume   331.440
_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
  Tb  Tb0  1  0.875  0.757  0.382  1.0
  Tb  Tb1  1  0.507  0.125  0.882  1.0
  Tb  Tb2  1  0.375  0.493  0.618  1.0
  Tb  Tb3  1  0.243  0.625  0.118  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  0.507  0.378  0.263  1.0
  Se  Se7  1  0.756  0.493  0.871  1.0
  Se  Se8  1  0.115  0.244  0.737  1.0
  Se  Se9  1  0.622  0.885  0.129  1.0
  Se  Se10  1  0.243  0.006  0.371  1.0
  Se  Se11  1  0.994  0.365  0.237  1.0
  Se  Se12  1  0.635  0.872  0.629  1.0
  Se  Se13  1  0.128  0.757  0.763  1.0
[/CIF]
.