The material structure described by CeMg2 crystallizes in the trigonal P-3m1 space group. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to three equivalent Mg(2) and nine Mg(1,1) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Mg(2)Ce3Mg9 cuboctahedra; corners with six equivalent Mg(1)Mg12 cuboctahedra; corners with six equivalent Ce(1)Ce9Mg3 cuboctahedra; edges with six equivalent Mg(2)Ce3Mg9 cuboctahedra; edges with twelve Mg(1,1)Mg12 cuboctahedra;  a faceface with one Ce(1)Ce9Mg3 cuboctahedra; faces with seven equivalent Mg(2)Ce3Mg9 cuboctahedra; and faces with twelve Mg(1,1)Mg12 cuboctahedra. In the second Mg site, Mg(2) is bonded to three equivalent Mg(1), six equivalent Mg(2), and three equivalent Ce(1) atoms to form MgCe3Mg9 cuboctahedra that share corners with six equivalent Mg(2)Ce3Mg9 cuboctahedra; corners with six equivalent Mg(1)Mg12 cuboctahedra; corners with six equivalent Ce(1)Ce9Mg3 cuboctahedra; edges with six equivalent Mg(2)Ce3Mg9 cuboctahedra; edges with six equivalent Mg(1)Mg12 cuboctahedra; edges with six equivalent Ce(1)Ce9Mg3 cuboctahedra; faces with six equivalent Mg(2)Ce3Mg9 cuboctahedra; faces with seven Mg(1,1)Mg12 cuboctahedra; and faces with seven equivalent Ce(1)Ce9Mg3 cuboctahedra. In the third Mg site, Mg(1) is bonded to three equivalent Mg(2) and nine Mg(1,1) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Mg(2)Ce3Mg9 cuboctahedra; corners with six equivalent Mg(1)Mg12 cuboctahedra; corners with six equivalent Ce(1)Ce9Mg3 cuboctahedra; edges with six equivalent Mg(2)Ce3Mg9 cuboctahedra; edges with twelve Mg(1,1)Mg12 cuboctahedra;  a faceface with one Ce(1)Ce9Mg3 cuboctahedra; faces with seven equivalent Mg(2)Ce3Mg9 cuboctahedra; and faces with twelve Mg(1,1)Mg12 cuboctahedra. Ce(1) is bonded to three equivalent Mg(2) and nine equivalent Ce(1) atoms to form distorted CeCe9Mg3 cuboctahedra that share corners with six equivalent Mg(2)Ce3Mg9 cuboctahedra, corners with six equivalent Mg(1)Mg12 cuboctahedra, corners with six equivalent Ce(1)Ce9Mg3 cuboctahedra, edges with six equivalent Mg(2)Ce3Mg9 cuboctahedra, edges with twelve equivalent Ce(1)Ce9Mg3 cuboctahedra,  a faceface with one Mg(1)Mg12 cuboctahedra, faces with seven equivalent Mg(2)Ce3Mg9 cuboctahedra, and faces with twelve equivalent Ce(1)Ce9Mg3 cuboctahedra. is represented by the CIF card [CIF]
data_CeMg2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.151
_cell_length_b   3.151
_cell_length_c   16.778
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   144.244
_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  0.667  0.333  0.593  1.0
  Ce  Ce1  1  0.333  0.667  0.407  1.0
  Mg  Mg2  1  0.667  0.333  0.923  1.0
  Mg  Mg3  1  0.333  0.667  0.768  1.0
  Mg  Mg4  1  0.667  0.333  0.233  1.0
  Mg  Mg5  1  0.333  0.667  0.077  1.0
[/CIF]
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The material structure described by CeMg2 crystallizes in the trigonal P-3m1 space group. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to three equivalent Mg(2) and nine Mg(1,1) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Mg(2)Ce3Mg9 cuboctahedra; corners with six equivalent Mg(1)Mg12 cuboctahedra; corners with six equivalent Ce(1)Ce9Mg3 cuboctahedra; edges with six equivalent Mg(2)Ce3Mg9 cuboctahedra; edges with twelve Mg(1,1)Mg12 cuboctahedra;  a faceface with one Ce(1)Ce9Mg3 cuboctahedra; faces with seven equivalent Mg(2)Ce3Mg9 cuboctahedra; and faces with twelve Mg(1,1)Mg12 cuboctahedra. In the second Mg site, Mg(2) is bonded to three equivalent Mg(1), six equivalent Mg(2), and three equivalent Ce(1) atoms to form MgCe3Mg9 cuboctahedra that share corners with six equivalent Mg(2)Ce3Mg9 cuboctahedra; corners with six equivalent Mg(1)Mg12 cuboctahedra; corners with six equivalent Ce(1)Ce9Mg3 cuboctahedra; edges with six equivalent Mg(2)Ce3Mg9 cuboctahedra; edges with six equivalent Mg(1)Mg12 cuboctahedra; edges with six equivalent Ce(1)Ce9Mg3 cuboctahedra; faces with six equivalent Mg(2)Ce3Mg9 cuboctahedra; faces with seven Mg(1,1)Mg12 cuboctahedra; and faces with seven equivalent Ce(1)Ce9Mg3 cuboctahedra. In the third Mg site, Mg(1) is bonded to three equivalent Mg(2) and nine Mg(1,1) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Mg(2)Ce3Mg9 cuboctahedra; corners with six equivalent Mg(1)Mg12 cuboctahedra; corners with six equivalent Ce(1)Ce9Mg3 cuboctahedra; edges with six equivalent Mg(2)Ce3Mg9 cuboctahedra; edges with twelve Mg(1,1)Mg12 cuboctahedra;  a faceface with one Ce(1)Ce9Mg3 cuboctahedra; faces with seven equivalent Mg(2)Ce3Mg9 cuboctahedra; and faces with twelve Mg(1,1)Mg12 cuboctahedra. Ce(1) is bonded to three equivalent Mg(2) and nine equivalent Ce(1) atoms to form distorted CeCe9Mg3 cuboctahedra that share corners with six equivalent Mg(2)Ce3Mg9 cuboctahedra, corners with six equivalent Mg(1)Mg12 cuboctahedra, corners with six equivalent Ce(1)Ce9Mg3 cuboctahedra, edges with six equivalent Mg(2)Ce3Mg9 cuboctahedra, edges with twelve equivalent Ce(1)Ce9Mg3 cuboctahedra,  a faceface with one Mg(1)Mg12 cuboctahedra, faces with seven equivalent Mg(2)Ce3Mg9 cuboctahedra, and faces with twelve equivalent Ce(1)Ce9Mg3 cuboctahedra. is represented by the CIF card [CIF]
data_CeMg2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.151
_cell_length_b   3.151
_cell_length_c   16.778
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   144.244
_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  0.667  0.333  0.593  1.0
  Ce  Ce1  1  0.333  0.667  0.407  1.0
  Mg  Mg2  1  0.667  0.333  0.923  1.0
  Mg  Mg3  1  0.333  0.667  0.768  1.0
  Mg  Mg4  1  0.667  0.333  0.233  1.0
  Mg  Mg5  1  0.333  0.667  0.077  1.0
[/CIF]
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