The material described by MgCe2 is Magnesium-derived structured and crystallizes in the trigonal P-3m1 space group. Mg(1) is bonded to nine equivalent Mg(1) and three equivalent Ce(2) atoms to form MgCe3Mg9 cuboctahedra that share corners with six equivalent Mg(1)Ce3Mg9 cuboctahedra, corners with six equivalent Ce(1)Ce12 cuboctahedra, corners with six equivalent Ce(2)Ce9Mg3 cuboctahedra, edges with six equivalent Ce(2)Ce9Mg3 cuboctahedra, edges with twelve equivalent Mg(1)Ce3Mg9 cuboctahedra,  a faceface with one Ce(1)Ce12 cuboctahedra, faces with seven equivalent Ce(2)Ce9Mg3 cuboctahedra, and faces with twelve equivalent Mg(1)Ce3Mg9 cuboctahedra. There are three inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to three equivalent Ce(2) and nine Ce(1,1) atoms to form CeCe12 cuboctahedra that share corners with six equivalent Mg(1)Ce3Mg9 cuboctahedra; corners with six equivalent Ce(1)Ce12 cuboctahedra; corners with six equivalent Ce(2)Ce9Mg3 cuboctahedra; edges with six equivalent Ce(2)Ce9Mg3 cuboctahedra; edges with twelve Ce(1,1)Ce12 cuboctahedra;  a faceface with one Mg(1)Ce3Mg9 cuboctahedra; faces with seven equivalent Ce(2)Ce9Mg3 cuboctahedra; and faces with twelve Ce(1,1)Ce12 cuboctahedra. In the second Ce site, Ce(2) is bonded to three equivalent Mg(1), three equivalent Ce(1), and six equivalent Ce(2) atoms to form CeCe9Mg3 cuboctahedra that share corners with six equivalent Mg(1)Ce3Mg9 cuboctahedra; corners with six equivalent Ce(1)Ce12 cuboctahedra; corners with six equivalent Ce(2)Ce9Mg3 cuboctahedra; edges with six equivalent Mg(1)Ce3Mg9 cuboctahedra; edges with six equivalent Ce(1)Ce12 cuboctahedra; edges with six equivalent Ce(2)Ce9Mg3 cuboctahedra; faces with six equivalent Ce(2)Ce9Mg3 cuboctahedra; faces with seven equivalent Mg(1)Ce3Mg9 cuboctahedra; and faces with seven Ce(1,1)Ce12 cuboctahedra. In the third Ce site, Ce(1) is bonded to three equivalent Ce(2) and nine Ce(1,1) atoms to form CeCe12 cuboctahedra that share corners with six equivalent Mg(1)Ce3Mg9 cuboctahedra; corners with six equivalent Ce(1)Ce12 cuboctahedra; corners with six equivalent Ce(2)Ce9Mg3 cuboctahedra; edges with six equivalent Ce(2)Ce9Mg3 cuboctahedra; edges with twelve Ce(1,1)Ce12 cuboctahedra;  a faceface with one Mg(1)Ce3Mg9 cuboctahedra; faces with seven equivalent Ce(2)Ce9Mg3 cuboctahedra; and faces with twelve Ce(1,1)Ce12 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ce2Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.253
_cell_length_b   3.253
_cell_length_c   17.034
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   156.148
_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
  Ce  Ce0  1  0.333  0.667  0.918  1.0
  Ce  Ce1  1  0.667  0.333  0.749  1.0
  Ce  Ce2  1  0.333  0.667  0.251  1.0
  Ce  Ce3  1  0.667  0.333  0.082  1.0
  Mg  Mg4  1  0.333  0.667  0.578  1.0
  Mg  Mg5  1  0.667  0.333  0.422  1.0
[/CIF]
.
The material described by MgCe2 is Magnesium-derived structured and crystallizes in the trigonal P-3m1 space group. Mg(1) is bonded to nine equivalent Mg(1) and three equivalent Ce(2) atoms to form MgCe3Mg9 cuboctahedra that share corners with six equivalent Mg(1)Ce3Mg9 cuboctahedra, corners with six equivalent Ce(1)Ce12 cuboctahedra, corners with six equivalent Ce(2)Ce9Mg3 cuboctahedra, edges with six equivalent Ce(2)Ce9Mg3 cuboctahedra, edges with twelve equivalent Mg(1)Ce3Mg9 cuboctahedra,  a faceface with one Ce(1)Ce12 cuboctahedra, faces with seven equivalent Ce(2)Ce9Mg3 cuboctahedra, and faces with twelve equivalent Mg(1)Ce3Mg9 cuboctahedra. There are three inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to three equivalent Ce(2) and nine Ce(1,1) atoms to form CeCe12 cuboctahedra that share corners with six equivalent Mg(1)Ce3Mg9 cuboctahedra; corners with six equivalent Ce(1)Ce12 cuboctahedra; corners with six equivalent Ce(2)Ce9Mg3 cuboctahedra; edges with six equivalent Ce(2)Ce9Mg3 cuboctahedra; edges with twelve Ce(1,1)Ce12 cuboctahedra;  a faceface with one Mg(1)Ce3Mg9 cuboctahedra; faces with seven equivalent Ce(2)Ce9Mg3 cuboctahedra; and faces with twelve Ce(1,1)Ce12 cuboctahedra. In the second Ce site, Ce(2) is bonded to three equivalent Mg(1), three equivalent Ce(1), and six equivalent Ce(2) atoms to form CeCe9Mg3 cuboctahedra that share corners with six equivalent Mg(1)Ce3Mg9 cuboctahedra; corners with six equivalent Ce(1)Ce12 cuboctahedra; corners with six equivalent Ce(2)Ce9Mg3 cuboctahedra; edges with six equivalent Mg(1)Ce3Mg9 cuboctahedra; edges with six equivalent Ce(1)Ce12 cuboctahedra; edges with six equivalent Ce(2)Ce9Mg3 cuboctahedra; faces with six equivalent Ce(2)Ce9Mg3 cuboctahedra; faces with seven equivalent Mg(1)Ce3Mg9 cuboctahedra; and faces with seven Ce(1,1)Ce12 cuboctahedra. In the third Ce site, Ce(1) is bonded to three equivalent Ce(2) and nine Ce(1,1) atoms to form CeCe12 cuboctahedra that share corners with six equivalent Mg(1)Ce3Mg9 cuboctahedra; corners with six equivalent Ce(1)Ce12 cuboctahedra; corners with six equivalent Ce(2)Ce9Mg3 cuboctahedra; edges with six equivalent Ce(2)Ce9Mg3 cuboctahedra; edges with twelve Ce(1,1)Ce12 cuboctahedra;  a faceface with one Mg(1)Ce3Mg9 cuboctahedra; faces with seven equivalent Ce(2)Ce9Mg3 cuboctahedra; and faces with twelve Ce(1,1)Ce12 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ce2Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.253
_cell_length_b   3.253
_cell_length_c   17.034
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   156.148
_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
  Ce  Ce0  1  0.333  0.667  0.918  1.0
  Ce  Ce1  1  0.667  0.333  0.749  1.0
  Ce  Ce2  1  0.333  0.667  0.251  1.0
  Ce  Ce3  1  0.667  0.333  0.082  1.0
  Mg  Mg4  1  0.333  0.667  0.578  1.0
  Mg  Mg5  1  0.667  0.333  0.422  1.0
[/CIF]
.