The crystal structure described by MgCe2 crystallizes in the hexagonal P-62m space group. Mg(1) is bonded to three equivalent Mg(1), three equivalent Ce(2), and six equivalent Ce(1) atoms to form MgCe9Mg3 cuboctahedra that share corners with nine equivalent Mg(1)Ce9Mg3 cuboctahedra, corners with nine equivalent Ce(2)Ce6Mg6 cuboctahedra, edges with six equivalent Mg(1)Ce9Mg3 cuboctahedra, edges with twelve equivalent Ce(1)Ce8Mg4 cuboctahedra, faces with three equivalent Ce(2)Ce6Mg6 cuboctahedra, faces with five equivalent Mg(1)Ce9Mg3 cuboctahedra, and faces with twelve equivalent Ce(1)Ce8Mg4 cuboctahedra. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to four equivalent Mg(1), two equivalent Ce(2), and six equivalent Ce(1) atoms to form CeCe8Mg4 cuboctahedra that share corners with eighteen equivalent Ce(1)Ce8Mg4 cuboctahedra, edges with four equivalent Ce(2)Ce6Mg6 cuboctahedra, edges with six equivalent Ce(1)Ce8Mg4 cuboctahedra, edges with eight equivalent Mg(1)Ce9Mg3 cuboctahedra, faces with four equivalent Ce(2)Ce6Mg6 cuboctahedra, faces with eight equivalent Mg(1)Ce9Mg3 cuboctahedra, and faces with eight equivalent Ce(1)Ce8Mg4 cuboctahedra. In the second Ce site, Ce(2) is bonded to six equivalent Mg(1) and six equivalent Ce(1) atoms to form CeCe6Mg6 cuboctahedra that share corners with eighteen equivalent Mg(1)Ce9Mg3 cuboctahedra, edges with six equivalent Ce(2)Ce6Mg6 cuboctahedra, edges with twelve equivalent Ce(1)Ce8Mg4 cuboctahedra, faces with two equivalent Ce(2)Ce6Mg6 cuboctahedra, faces with six equivalent Mg(1)Ce9Mg3 cuboctahedra, and faces with twelve equivalent Ce(1)Ce8Mg4 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ce2Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.769
_cell_length_b   5.769
_cell_length_c   5.639
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   162.542
_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  0.000  0.666  0.000  1.0
  Ce  Ce1  1  0.666  0.000  0.000  1.0
  Ce  Ce2  1  0.334  0.334  0.000  1.0
  Ce  Ce3  1  0.000  0.000  0.500  1.0
  Mg  Mg4  1  0.667  0.333  0.500  1.0
  Mg  Mg5  1  0.333  0.667  0.500  1.0
[/CIF]
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The crystal structure described by MgCe2 crystallizes in the hexagonal P-62m space group. Mg(1) is bonded to three equivalent Mg(1), three equivalent Ce(2), and six equivalent Ce(1) atoms to form MgCe9Mg3 cuboctahedra that share corners with nine equivalent Mg(1)Ce9Mg3 cuboctahedra, corners with nine equivalent Ce(2)Ce6Mg6 cuboctahedra, edges with six equivalent Mg(1)Ce9Mg3 cuboctahedra, edges with twelve equivalent Ce(1)Ce8Mg4 cuboctahedra, faces with three equivalent Ce(2)Ce6Mg6 cuboctahedra, faces with five equivalent Mg(1)Ce9Mg3 cuboctahedra, and faces with twelve equivalent Ce(1)Ce8Mg4 cuboctahedra. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to four equivalent Mg(1), two equivalent Ce(2), and six equivalent Ce(1) atoms to form CeCe8Mg4 cuboctahedra that share corners with eighteen equivalent Ce(1)Ce8Mg4 cuboctahedra, edges with four equivalent Ce(2)Ce6Mg6 cuboctahedra, edges with six equivalent Ce(1)Ce8Mg4 cuboctahedra, edges with eight equivalent Mg(1)Ce9Mg3 cuboctahedra, faces with four equivalent Ce(2)Ce6Mg6 cuboctahedra, faces with eight equivalent Mg(1)Ce9Mg3 cuboctahedra, and faces with eight equivalent Ce(1)Ce8Mg4 cuboctahedra. In the second Ce site, Ce(2) is bonded to six equivalent Mg(1) and six equivalent Ce(1) atoms to form CeCe6Mg6 cuboctahedra that share corners with eighteen equivalent Mg(1)Ce9Mg3 cuboctahedra, edges with six equivalent Ce(2)Ce6Mg6 cuboctahedra, edges with twelve equivalent Ce(1)Ce8Mg4 cuboctahedra, faces with two equivalent Ce(2)Ce6Mg6 cuboctahedra, faces with six equivalent Mg(1)Ce9Mg3 cuboctahedra, and faces with twelve equivalent Ce(1)Ce8Mg4 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ce2Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.769
_cell_length_b   5.769
_cell_length_c   5.639
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   162.542
_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  0.000  0.666  0.000  1.0
  Ce  Ce1  1  0.666  0.000  0.000  1.0
  Ce  Ce2  1  0.334  0.334  0.000  1.0
  Ce  Ce3  1  0.000  0.000  0.500  1.0
  Mg  Mg4  1  0.667  0.333  0.500  1.0
  Mg  Mg5  1  0.333  0.667  0.500  1.0
[/CIF]
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