The compound described by LiMg6Ce crystallizes in the orthorhombic Amm2 space group. Li(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Mg(3), four equivalent Mg(2), and two equivalent Ce(1) atoms. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to one Li(1), one Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Ce(1) atoms. In the second Mg site, Mg(2) is bonded in a 4-coordinate geometry to two equivalent Li(1), two equivalent Mg(1), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Ce(1) atoms. In the third Mg site, Mg(3) is bonded to two equivalent Li(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(2) atoms to form distorted MgLi2Mg10 cuboctahedra that share corners with four equivalent Mg(4)Ce2Mg10 cuboctahedra, corners with six equivalent Mg(3)Li2Mg10 cuboctahedra, edges with two equivalent Mg(4)Ce2Mg10 cuboctahedra, faces with two equivalent Mg(4)Ce2Mg10 cuboctahedra, faces with two equivalent Mg(3)Li2Mg10 cuboctahedra, and faces with six equivalent Ce(1)Li2Mg10 cuboctahedra. In the fourth Mg site, Mg(4) is bonded to two equivalent Mg(3), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Ce(1) atoms to form distorted MgCe2Mg10 cuboctahedra that share corners with four equivalent Mg(3)Li2Mg10 cuboctahedra, corners with six equivalent Mg(4)Ce2Mg10 cuboctahedra, edges with two equivalent Mg(3)Li2Mg10 cuboctahedra, edges with four equivalent Ce(1)Li2Mg10 cuboctahedra, faces with two equivalent Mg(4)Ce2Mg10 cuboctahedra, faces with two equivalent Mg(3)Li2Mg10 cuboctahedra, and faces with two equivalent Ce(1)Li2Mg10 cuboctahedra. Ce(1) is bonded to two equivalent Li(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(2) atoms to form CeLi2Mg10 cuboctahedra that share corners with six equivalent Ce(1)Li2Mg10 cuboctahedra, edges with four equivalent Mg(4)Ce2Mg10 cuboctahedra, faces with two equivalent Mg(4)Ce2Mg10 cuboctahedra, faces with two equivalent Ce(1)Li2Mg10 cuboctahedra, and faces with six equivalent Mg(3)Li2Mg10 cuboctahedra. is represented by the CIF card [CIF]
data_LiCeMg6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.752
_cell_length_b   6.776
_cell_length_c   5.213
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.118
_symmetry_Int_Tables_number   1
_cell_volume   206.347
_cell_formula_units_Z   1
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
  Li  Li0  1  0.177  0.338  0.250  1.0
  Ce  Ce1  1  0.174  0.837  0.250  1.0
  Mg  Mg2  1  0.659  0.346  0.250  1.0
  Mg  Mg3  1  0.659  0.813  0.250  1.0
  Mg  Mg4  1  0.336  0.180  0.750  1.0
  Mg  Mg5  1  0.336  0.656  0.750  1.0
  Mg  Mg6  1  0.830  0.165  0.750  1.0
  Mg  Mg7  1  0.828  0.664  0.750  1.0
[/CIF]
.
The compound described by LiMg6Ce crystallizes in the orthorhombic Amm2 space group. Li(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Mg(3), four equivalent Mg(2), and two equivalent Ce(1) atoms. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to one Li(1), one Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Ce(1) atoms. In the second Mg site, Mg(2) is bonded in a 4-coordinate geometry to two equivalent Li(1), two equivalent Mg(1), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Ce(1) atoms. In the third Mg site, Mg(3) is bonded to two equivalent Li(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(2) atoms to form distorted MgLi2Mg10 cuboctahedra that share corners with four equivalent Mg(4)Ce2Mg10 cuboctahedra, corners with six equivalent Mg(3)Li2Mg10 cuboctahedra, edges with two equivalent Mg(4)Ce2Mg10 cuboctahedra, faces with two equivalent Mg(4)Ce2Mg10 cuboctahedra, faces with two equivalent Mg(3)Li2Mg10 cuboctahedra, and faces with six equivalent Ce(1)Li2Mg10 cuboctahedra. In the fourth Mg site, Mg(4) is bonded to two equivalent Mg(3), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Ce(1) atoms to form distorted MgCe2Mg10 cuboctahedra that share corners with four equivalent Mg(3)Li2Mg10 cuboctahedra, corners with six equivalent Mg(4)Ce2Mg10 cuboctahedra, edges with two equivalent Mg(3)Li2Mg10 cuboctahedra, edges with four equivalent Ce(1)Li2Mg10 cuboctahedra, faces with two equivalent Mg(4)Ce2Mg10 cuboctahedra, faces with two equivalent Mg(3)Li2Mg10 cuboctahedra, and faces with two equivalent Ce(1)Li2Mg10 cuboctahedra. Ce(1) is bonded to two equivalent Li(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(2) atoms to form CeLi2Mg10 cuboctahedra that share corners with six equivalent Ce(1)Li2Mg10 cuboctahedra, edges with four equivalent Mg(4)Ce2Mg10 cuboctahedra, faces with two equivalent Mg(4)Ce2Mg10 cuboctahedra, faces with two equivalent Ce(1)Li2Mg10 cuboctahedra, and faces with six equivalent Mg(3)Li2Mg10 cuboctahedra. is represented by the CIF card [CIF]
data_LiCeMg6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.752
_cell_length_b   6.776
_cell_length_c   5.213
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.118
_symmetry_Int_Tables_number   1
_cell_volume   206.347
_cell_formula_units_Z   1
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
  Li  Li0  1  0.177  0.338  0.250  1.0
  Ce  Ce1  1  0.174  0.837  0.250  1.0
  Mg  Mg2  1  0.659  0.346  0.250  1.0
  Mg  Mg3  1  0.659  0.813  0.250  1.0
  Mg  Mg4  1  0.336  0.180  0.750  1.0
  Mg  Mg5  1  0.336  0.656  0.750  1.0
  Mg  Mg6  1  0.830  0.165  0.750  1.0
  Mg  Mg7  1  0.828  0.664  0.750  1.0
[/CIF]
.