The crystal structure described by Mg3Ce crystallizes in the orthorhombic Imm2 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), four equivalent Mg(2), and four equivalent Ce(1) atoms. In the second Mg site, Mg(2) is bonded in a 11-coordinate geometry to two equivalent Mg(1), six equivalent Mg(2), and three equivalent Ce(1) atoms. Ce(1) is bonded to four equivalent Mg(1), six equivalent Mg(2), and two equivalent Ce(1) atoms to form a mixture of edge, face, and corner-sharing CeCe2Mg10 cuboctahedra. is represented by the CIF file [CIF]
data_CeMg3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.672
_cell_length_b   6.672
_cell_length_c   6.672
_cell_angle_alpha   152.416
_cell_angle_beta   126.553
_cell_angle_gamma   61.190
_symmetry_Int_Tables_number   1
_cell_volume   109.609
_cell_formula_units_Z   1
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  0.337  0.000  0.337  1.0
  Mg  Mg1  1  0.833  0.500  0.333  1.0
  Mg  Mg2  1  0.243  0.244  0.998  1.0
  Mg  Mg3  1  0.754  0.756  0.998  1.0
[/CIF]
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The crystal structure described by Mg3Ce crystallizes in the orthorhombic Imm2 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), four equivalent Mg(2), and four equivalent Ce(1) atoms. In the second Mg site, Mg(2) is bonded in a 11-coordinate geometry to two equivalent Mg(1), six equivalent Mg(2), and three equivalent Ce(1) atoms. Ce(1) is bonded to four equivalent Mg(1), six equivalent Mg(2), and two equivalent Ce(1) atoms to form a mixture of edge, face, and corner-sharing CeCe2Mg10 cuboctahedra. is represented by the CIF file [CIF]
data_CeMg3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.672
_cell_length_b   6.672
_cell_length_c   6.672
_cell_angle_alpha   152.416
_cell_angle_beta   126.553
_cell_angle_gamma   61.190
_symmetry_Int_Tables_number   1
_cell_volume   109.609
_cell_formula_units_Z   1
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  0.337  0.000  0.337  1.0
  Mg  Mg1  1  0.833  0.500  0.333  1.0
  Mg  Mg2  1  0.243  0.244  0.998  1.0
  Mg  Mg3  1  0.754  0.756  0.998  1.0
[/CIF]
.