The material described by Tb4NiMg crystallizes in the cubic F-43m space group. Mg(1) is bonded to three equivalent Mg(1), three equivalent Tb(1), three equivalent Tb(2), and three equivalent Tb(3) atoms to form a mixture of corner and face-sharing MgTb9Mg3 cuboctahedra. There are three inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 14-coordinate geometry to two equivalent Mg(1), two equivalent Tb(3), four equivalent Tb(1), four equivalent Tb(2), and two equivalent Ni(1) atoms. In the second Tb site, Tb(2) is bonded in a distorted bent 150 degrees geometry to two equivalent Mg(1), four equivalent Tb(1), and two equivalent Ni(1) atoms. In the third Tb site, Tb(3) is bonded in a 3-coordinate geometry to three equivalent Mg(1), three equivalent Tb(1), and three equivalent Ni(1) atoms. Ni(1) is bonded in a 6-coordinate geometry to three equivalent Tb(1), three equivalent Tb(2), and three equivalent Tb(3) atoms. is represented by the CIF file [CIF]
data_Tb4MgNi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.630
_cell_length_b   9.630
_cell_length_c   9.630
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   631.524
_cell_formula_units_Z   4
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  0.185  0.815  0.815  1.0
  Tb  Tb1  1  0.815  0.185  0.185  1.0
  Tb  Tb2  1  0.815  0.185  0.815  1.0
  Tb  Tb3  1  0.185  0.815  0.185  1.0
  Tb  Tb4  1  0.815  0.815  0.185  1.0
  Tb  Tb5  1  0.185  0.185  0.815  1.0
  Tb  Tb6  1  0.062  0.438  0.438  1.0
  Tb  Tb7  1  0.438  0.062  0.062  1.0
  Tb  Tb8  1  0.438  0.062  0.438  1.0
  Tb  Tb9  1  0.062  0.438  0.062  1.0
  Tb  Tb10  1  0.438  0.438  0.062  1.0
  Tb  Tb11  1  0.062  0.062  0.438  1.0
  Tb  Tb12  1  0.596  0.596  0.596  1.0
  Tb  Tb13  1  0.596  0.596  0.212  1.0
  Tb  Tb14  1  0.596  0.212  0.596  1.0
  Tb  Tb15  1  0.212  0.596  0.596  1.0
  Mg  Mg16  1  0.829  0.829  0.829  1.0
  Mg  Mg17  1  0.829  0.829  0.512  1.0
  Mg  Mg18  1  0.829  0.512  0.829  1.0
  Mg  Mg19  1  0.512  0.829  0.829  1.0
  Ni  Ni20  1  0.392  0.392  0.392  1.0
  Ni  Ni21  1  0.392  0.392  0.824  1.0
  Ni  Ni22  1  0.392  0.824  0.392  1.0
  Ni  Ni23  1  0.824  0.392  0.392  1.0
[/CIF]
.
The material described by Tb4NiMg crystallizes in the cubic F-43m space group. Mg(1) is bonded to three equivalent Mg(1), three equivalent Tb(1), three equivalent Tb(2), and three equivalent Tb(3) atoms to form a mixture of corner and face-sharing MgTb9Mg3 cuboctahedra. There are three inequivalent Tb sites. In the first Tb site, Tb(1) is bonded in a 14-coordinate geometry to two equivalent Mg(1), two equivalent Tb(3), four equivalent Tb(1), four equivalent Tb(2), and two equivalent Ni(1) atoms. In the second Tb site, Tb(2) is bonded in a distorted bent 150 degrees geometry to two equivalent Mg(1), four equivalent Tb(1), and two equivalent Ni(1) atoms. In the third Tb site, Tb(3) is bonded in a 3-coordinate geometry to three equivalent Mg(1), three equivalent Tb(1), and three equivalent Ni(1) atoms. Ni(1) is bonded in a 6-coordinate geometry to three equivalent Tb(1), three equivalent Tb(2), and three equivalent Tb(3) atoms. is represented by the CIF file [CIF]
data_Tb4MgNi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.630
_cell_length_b   9.630
_cell_length_c   9.630
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   631.524
_cell_formula_units_Z   4
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  0.185  0.815  0.815  1.0
  Tb  Tb1  1  0.815  0.185  0.185  1.0
  Tb  Tb2  1  0.815  0.185  0.815  1.0
  Tb  Tb3  1  0.185  0.815  0.185  1.0
  Tb  Tb4  1  0.815  0.815  0.185  1.0
  Tb  Tb5  1  0.185  0.185  0.815  1.0
  Tb  Tb6  1  0.062  0.438  0.438  1.0
  Tb  Tb7  1  0.438  0.062  0.062  1.0
  Tb  Tb8  1  0.438  0.062  0.438  1.0
  Tb  Tb9  1  0.062  0.438  0.062  1.0
  Tb  Tb10  1  0.438  0.438  0.062  1.0
  Tb  Tb11  1  0.062  0.062  0.438  1.0
  Tb  Tb12  1  0.596  0.596  0.596  1.0
  Tb  Tb13  1  0.596  0.596  0.212  1.0
  Tb  Tb14  1  0.596  0.212  0.596  1.0
  Tb  Tb15  1  0.212  0.596  0.596  1.0
  Mg  Mg16  1  0.829  0.829  0.829  1.0
  Mg  Mg17  1  0.829  0.829  0.512  1.0
  Mg  Mg18  1  0.829  0.512  0.829  1.0
  Mg  Mg19  1  0.512  0.829  0.829  1.0
  Ni  Ni20  1  0.392  0.392  0.392  1.0
  Ni  Ni21  1  0.392  0.392  0.824  1.0
  Ni  Ni22  1  0.392  0.824  0.392  1.0
  Ni  Ni23  1  0.824  0.392  0.392  1.0
[/CIF]
.