The crystal structure described by MgCe2 is beta-derived structured and crystallizes in the monoclinic C2/m space group. Mg(1) is bonded to three equivalent Mg(1), four equivalent Ce(2), and five equivalent Ce(1) atoms to form MgCe9Mg3 cuboctahedra that share corners with six equivalent Mg(1)Ce9Mg3 cuboctahedra, corners with six equivalent Ce(1)Ce7Mg5 cuboctahedra, corners with six equivalent Ce(2)Ce8Mg4 cuboctahedra, edges with four equivalent Mg(1)Ce9Mg3 cuboctahedra, edges with five equivalent Ce(1)Ce7Mg5 cuboctahedra, edges with nine equivalent Ce(2)Ce8Mg4 cuboctahedra, faces with six equivalent Mg(1)Ce9Mg3 cuboctahedra, faces with six equivalent Ce(2)Ce8Mg4 cuboctahedra, and faces with eight equivalent Ce(1)Ce7Mg5 cuboctahedra. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to five equivalent Mg(1), three equivalent Ce(2), and four equivalent Ce(1) atoms to form CeCe7Mg5 cuboctahedra that share corners with six equivalent Mg(1)Ce9Mg3 cuboctahedra, corners with six equivalent Ce(1)Ce7Mg5 cuboctahedra, corners with six equivalent Ce(2)Ce8Mg4 cuboctahedra, edges with five equivalent Mg(1)Ce9Mg3 cuboctahedra, edges with six equivalent Ce(1)Ce7Mg5 cuboctahedra, edges with seven equivalent Ce(2)Ce8Mg4 cuboctahedra, faces with five equivalent Ce(1)Ce7Mg5 cuboctahedra, faces with seven equivalent Ce(2)Ce8Mg4 cuboctahedra, and faces with eight equivalent Mg(1)Ce9Mg3 cuboctahedra. In the second Ce site, Ce(2) is bonded to four equivalent Mg(1), three equivalent Ce(1), and five equivalent Ce(2) atoms to form distorted CeCe8Mg4 cuboctahedra that share corners with six equivalent Mg(1)Ce9Mg3 cuboctahedra, corners with six equivalent Ce(1)Ce7Mg5 cuboctahedra, corners with six equivalent Ce(2)Ce8Mg4 cuboctahedra, edges with two equivalent Ce(2)Ce8Mg4 cuboctahedra, edges with seven equivalent Ce(1)Ce7Mg5 cuboctahedra, edges with nine equivalent Mg(1)Ce9Mg3 cuboctahedra, faces with six equivalent Mg(1)Ce9Mg3 cuboctahedra, faces with seven equivalent Ce(1)Ce7Mg5 cuboctahedra, and faces with seven equivalent Ce(2)Ce8Mg4 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ce2Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.694
_cell_length_b   6.694
_cell_length_c   7.734
_cell_angle_alpha   77.185
_cell_angle_beta   77.185
_cell_angle_gamma   27.922
_symmetry_Int_Tables_number   1
_cell_volume   157.981
_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  0.798  0.798  0.143  1.0
  Ce  Ce1  1  0.138  0.138  0.467  1.0
  Ce  Ce2  1  0.862  0.862  0.533  1.0
  Ce  Ce3  1  0.202  0.202  0.857  1.0
  Mg  Mg4  1  0.528  0.528  0.186  1.0
  Mg  Mg5  1  0.472  0.472  0.814  1.0
[/CIF]
.
The crystal structure described by MgCe2 is beta-derived structured and crystallizes in the monoclinic C2/m space group. Mg(1) is bonded to three equivalent Mg(1), four equivalent Ce(2), and five equivalent Ce(1) atoms to form MgCe9Mg3 cuboctahedra that share corners with six equivalent Mg(1)Ce9Mg3 cuboctahedra, corners with six equivalent Ce(1)Ce7Mg5 cuboctahedra, corners with six equivalent Ce(2)Ce8Mg4 cuboctahedra, edges with four equivalent Mg(1)Ce9Mg3 cuboctahedra, edges with five equivalent Ce(1)Ce7Mg5 cuboctahedra, edges with nine equivalent Ce(2)Ce8Mg4 cuboctahedra, faces with six equivalent Mg(1)Ce9Mg3 cuboctahedra, faces with six equivalent Ce(2)Ce8Mg4 cuboctahedra, and faces with eight equivalent Ce(1)Ce7Mg5 cuboctahedra. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to five equivalent Mg(1), three equivalent Ce(2), and four equivalent Ce(1) atoms to form CeCe7Mg5 cuboctahedra that share corners with six equivalent Mg(1)Ce9Mg3 cuboctahedra, corners with six equivalent Ce(1)Ce7Mg5 cuboctahedra, corners with six equivalent Ce(2)Ce8Mg4 cuboctahedra, edges with five equivalent Mg(1)Ce9Mg3 cuboctahedra, edges with six equivalent Ce(1)Ce7Mg5 cuboctahedra, edges with seven equivalent Ce(2)Ce8Mg4 cuboctahedra, faces with five equivalent Ce(1)Ce7Mg5 cuboctahedra, faces with seven equivalent Ce(2)Ce8Mg4 cuboctahedra, and faces with eight equivalent Mg(1)Ce9Mg3 cuboctahedra. In the second Ce site, Ce(2) is bonded to four equivalent Mg(1), three equivalent Ce(1), and five equivalent Ce(2) atoms to form distorted CeCe8Mg4 cuboctahedra that share corners with six equivalent Mg(1)Ce9Mg3 cuboctahedra, corners with six equivalent Ce(1)Ce7Mg5 cuboctahedra, corners with six equivalent Ce(2)Ce8Mg4 cuboctahedra, edges with two equivalent Ce(2)Ce8Mg4 cuboctahedra, edges with seven equivalent Ce(1)Ce7Mg5 cuboctahedra, edges with nine equivalent Mg(1)Ce9Mg3 cuboctahedra, faces with six equivalent Mg(1)Ce9Mg3 cuboctahedra, faces with seven equivalent Ce(1)Ce7Mg5 cuboctahedra, and faces with seven equivalent Ce(2)Ce8Mg4 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ce2Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.694
_cell_length_b   6.694
_cell_length_c   7.734
_cell_angle_alpha   77.185
_cell_angle_beta   77.185
_cell_angle_gamma   27.922
_symmetry_Int_Tables_number   1
_cell_volume   157.981
_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  0.798  0.798  0.143  1.0
  Ce  Ce1  1  0.138  0.138  0.467  1.0
  Ce  Ce2  1  0.862  0.862  0.533  1.0
  Ce  Ce3  1  0.202  0.202  0.857  1.0
  Mg  Mg4  1  0.528  0.528  0.186  1.0
  Mg  Mg5  1  0.472  0.472  0.814  1.0
[/CIF]
.