The compound described by MgCe2 is beta-derived structured and crystallizes in the orthorhombic Cmcm space group. Mg(1) is bonded to two equivalent Mg(1), four equivalent Ce(2), and six equivalent Ce(1) atoms to form MgCe10Mg2 cuboctahedra that share corners with six equivalent Mg(1)Ce10Mg2 cuboctahedra, corners with six equivalent Ce(1)Ce6Mg6 cuboctahedra, corners with six equivalent Ce(2)Ce8Mg4 cuboctahedra, edges with three equivalent Ce(2)Ce8Mg4 cuboctahedra, edges with seven equivalent Ce(1)Ce6Mg6 cuboctahedra, edges with eight equivalent Mg(1)Ce10Mg2 cuboctahedra, faces with six equivalent Mg(1)Ce10Mg2 cuboctahedra, faces with six equivalent Ce(1)Ce6Mg6 cuboctahedra, and faces with eight equivalent Ce(2)Ce8Mg4 cuboctahedra. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to six equivalent Mg(1), two equivalent Ce(2), and four equivalent Ce(1) atoms to form distorted CeCe6Mg6 cuboctahedra that share corners with six equivalent Mg(1)Ce10Mg2 cuboctahedra, corners with six equivalent Ce(1)Ce6Mg6 cuboctahedra, corners with six equivalent Ce(2)Ce8Mg4 cuboctahedra, edges with seven equivalent Mg(1)Ce10Mg2 cuboctahedra, edges with eleven equivalent Ce(2)Ce8Mg4 cuboctahedra, faces with four equivalent Ce(2)Ce8Mg4 cuboctahedra, faces with six equivalent Mg(1)Ce10Mg2 cuboctahedra, and faces with ten equivalent Ce(1)Ce6Mg6 cuboctahedra. In the second Ce site, Ce(2) is bonded to four equivalent Mg(1), two equivalent Ce(1), and six equivalent Ce(2) atoms to form CeCe8Mg4 cuboctahedra that share corners with six equivalent Mg(1)Ce10Mg2 cuboctahedra, corners with six equivalent Ce(1)Ce6Mg6 cuboctahedra, corners with six equivalent Ce(2)Ce8Mg4 cuboctahedra, edges with three equivalent Mg(1)Ce10Mg2 cuboctahedra, edges with four equivalent Ce(2)Ce8Mg4 cuboctahedra, edges with eleven equivalent Ce(1)Ce6Mg6 cuboctahedra, faces with four equivalent Ce(1)Ce6Mg6 cuboctahedra, faces with eight equivalent Mg(1)Ce10Mg2 cuboctahedra, and faces with eight 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   3.239
_cell_length_b   5.665
_cell_length_c   9.017
_cell_angle_alpha   90.000
_cell_angle_beta   100.347
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   162.761
_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  0.435  0.750  0.869  1.0
  Ce  Ce1  1  0.777  0.750  0.555  1.0
  Ce  Ce2  1  0.223  0.250  0.445  1.0
  Ce  Ce3  1  0.565  0.250  0.131  1.0
  Mg  Mg4  1  0.113  0.750  0.225  1.0
  Mg  Mg5  1  0.887  0.250  0.775  1.0
[/CIF]
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The compound described by MgCe2 is beta-derived structured and crystallizes in the orthorhombic Cmcm space group. Mg(1) is bonded to two equivalent Mg(1), four equivalent Ce(2), and six equivalent Ce(1) atoms to form MgCe10Mg2 cuboctahedra that share corners with six equivalent Mg(1)Ce10Mg2 cuboctahedra, corners with six equivalent Ce(1)Ce6Mg6 cuboctahedra, corners with six equivalent Ce(2)Ce8Mg4 cuboctahedra, edges with three equivalent Ce(2)Ce8Mg4 cuboctahedra, edges with seven equivalent Ce(1)Ce6Mg6 cuboctahedra, edges with eight equivalent Mg(1)Ce10Mg2 cuboctahedra, faces with six equivalent Mg(1)Ce10Mg2 cuboctahedra, faces with six equivalent Ce(1)Ce6Mg6 cuboctahedra, and faces with eight equivalent Ce(2)Ce8Mg4 cuboctahedra. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to six equivalent Mg(1), two equivalent Ce(2), and four equivalent Ce(1) atoms to form distorted CeCe6Mg6 cuboctahedra that share corners with six equivalent Mg(1)Ce10Mg2 cuboctahedra, corners with six equivalent Ce(1)Ce6Mg6 cuboctahedra, corners with six equivalent Ce(2)Ce8Mg4 cuboctahedra, edges with seven equivalent Mg(1)Ce10Mg2 cuboctahedra, edges with eleven equivalent Ce(2)Ce8Mg4 cuboctahedra, faces with four equivalent Ce(2)Ce8Mg4 cuboctahedra, faces with six equivalent Mg(1)Ce10Mg2 cuboctahedra, and faces with ten equivalent Ce(1)Ce6Mg6 cuboctahedra. In the second Ce site, Ce(2) is bonded to four equivalent Mg(1), two equivalent Ce(1), and six equivalent Ce(2) atoms to form CeCe8Mg4 cuboctahedra that share corners with six equivalent Mg(1)Ce10Mg2 cuboctahedra, corners with six equivalent Ce(1)Ce6Mg6 cuboctahedra, corners with six equivalent Ce(2)Ce8Mg4 cuboctahedra, edges with three equivalent Mg(1)Ce10Mg2 cuboctahedra, edges with four equivalent Ce(2)Ce8Mg4 cuboctahedra, edges with eleven equivalent Ce(1)Ce6Mg6 cuboctahedra, faces with four equivalent Ce(1)Ce6Mg6 cuboctahedra, faces with eight equivalent Mg(1)Ce10Mg2 cuboctahedra, and faces with eight 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   3.239
_cell_length_b   5.665
_cell_length_c   9.017
_cell_angle_alpha   90.000
_cell_angle_beta   100.347
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   162.761
_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  0.435  0.750  0.869  1.0
  Ce  Ce1  1  0.777  0.750  0.555  1.0
  Ce  Ce2  1  0.223  0.250  0.445  1.0
  Ce  Ce3  1  0.565  0.250  0.131  1.0
  Mg  Mg4  1  0.113  0.750  0.225  1.0
  Mg  Mg5  1  0.887  0.250  0.775  1.0
[/CIF]
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