The material structure described by Ce2Mg17 crystallizes in the hexagonal P6_3/mmc space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(4), four equivalent Mg(2), four equivalent Mg(3), and two equivalent Ce(2) atoms to form distorted MgCe2Mg10 cuboctahedra that share corners with four equivalent Mg(1)Ce2Mg10 cuboctahedra, corners with ten equivalent Mg(2)Ce3Mg9 cuboctahedra, edges with six equivalent Mg(2)Ce3Mg9 cuboctahedra, faces with four equivalent Mg(2)Ce3Mg9 cuboctahedra, faces with six equivalent Mg(1)Ce2Mg10 cuboctahedra, and faces with two equivalent Ce(2)Mg20 hexagonal bipyramids. In the second Mg site, Mg(2) is bonded to one Mg(4), two equivalent Mg(1), two equivalent Mg(2), four equivalent Mg(3), one Ce(2), and two equivalent Ce(1) atoms to form distorted MgCe3Mg9 cuboctahedra that share corners with five equivalent Mg(1)Ce2Mg10 cuboctahedra, corners with ten equivalent Mg(2)Ce3Mg9 cuboctahedra, edges with three equivalent Mg(1)Ce2Mg10 cuboctahedra, edges with five equivalent Mg(2)Ce3Mg9 cuboctahedra, faces with two equivalent Mg(1)Ce2Mg10 cuboctahedra, faces with eight equivalent Mg(2)Ce3Mg9 cuboctahedra, and faces with three equivalent Ce(2)Mg20 hexagonal bipyramids. In the third Mg site, Mg(3) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Mg(3), four equivalent Mg(2), one Ce(1), and one Ce(2) atom. In the fourth Mg site, Mg(4) is bonded in a 8-coordinate geometry to one Mg(4), three equivalent Mg(1), three equivalent Mg(2), and one Ce(2) atom. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a distorted hexagonal planar geometry to six equivalent Mg(3) and twelve equivalent Mg(2) atoms. In the second Ce site, Ce(2) is bonded to two equivalent Mg(4), six equivalent Mg(1), six equivalent Mg(2), and six equivalent Mg(3) atoms to form distorted CeMg20 hexagonal bipyramids that share corners with six equivalent Ce(2)Mg20 hexagonal bipyramids, faces with six equivalent Mg(1)Ce2Mg10 cuboctahedra, and faces with eighteen equivalent Mg(2)Ce3Mg9 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ce2Mg17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.319
_cell_length_b   10.319
_cell_length_c   10.157
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   936.589
_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  0.000  0.250  1.0
  Ce  Ce1  1  0.000  0.000  0.750  1.0
  Ce  Ce2  1  0.667  0.333  0.250  1.0
  Ce  Ce3  1  0.333  0.667  0.750  1.0
  Mg  Mg4  1  0.500  0.000  0.500  1.0
  Mg  Mg5  1  0.500  0.500  0.500  1.0
  Mg  Mg6  1  0.835  0.165  0.498  1.0
  Mg  Mg7  1  0.330  0.165  0.002  1.0
  Mg  Mg8  1  0.165  0.330  0.502  1.0
  Mg  Mg9  1  0.667  0.662  0.750  1.0
  Mg  Mg10  1  0.667  0.333  0.895  1.0
  Mg  Mg11  1  0.333  0.667  0.395  1.0
  Mg  Mg12  1  0.670  0.835  0.998  1.0
  Mg  Mg13  1  0.338  0.333  0.750  1.0
  Mg  Mg14  1  0.005  0.338  0.250  1.0
  Mg  Mg15  1  0.835  0.165  0.002  1.0
  Mg  Mg16  1  0.662  0.995  0.250  1.0
  Mg  Mg17  1  0.995  0.662  0.750  1.0
  Mg  Mg18  1  0.330  0.165  0.498  1.0
  Mg  Mg19  1  0.835  0.670  0.498  1.0
  Mg  Mg20  1  0.165  0.330  0.998  1.0
  Mg  Mg21  1  0.835  0.670  0.002  1.0
  Mg  Mg22  1  0.667  0.333  0.605  1.0
  Mg  Mg23  1  0.670  0.835  0.502  1.0
  Mg  Mg24  1  0.000  0.500  0.000  1.0
  Mg  Mg25  1  0.333  0.995  0.250  1.0
  Mg  Mg26  1  0.333  0.338  0.250  1.0
  Mg  Mg27  1  0.333  0.667  0.105  1.0
  Mg  Mg28  1  0.165  0.835  0.502  1.0
  Mg  Mg29  1  0.005  0.667  0.250  1.0
  Mg  Mg30  1  0.667  0.005  0.750  1.0
  Mg  Mg31  1  0.165  0.835  0.998  1.0
  Mg  Mg32  1  0.662  0.667  0.250  1.0
  Mg  Mg33  1  0.500  0.500  0.000  1.0
  Mg  Mg34  1  0.995  0.333  0.750  1.0
  Mg  Mg35  1  0.338  0.005  0.750  1.0
  Mg  Mg36  1  0.000  0.500  0.500  1.0
  Mg  Mg37  1  0.500  0.000  0.000  1.0
[/CIF]
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The material structure described by Ce2Mg17 crystallizes in the hexagonal P6_3/mmc space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(4), four equivalent Mg(2), four equivalent Mg(3), and two equivalent Ce(2) atoms to form distorted MgCe2Mg10 cuboctahedra that share corners with four equivalent Mg(1)Ce2Mg10 cuboctahedra, corners with ten equivalent Mg(2)Ce3Mg9 cuboctahedra, edges with six equivalent Mg(2)Ce3Mg9 cuboctahedra, faces with four equivalent Mg(2)Ce3Mg9 cuboctahedra, faces with six equivalent Mg(1)Ce2Mg10 cuboctahedra, and faces with two equivalent Ce(2)Mg20 hexagonal bipyramids. In the second Mg site, Mg(2) is bonded to one Mg(4), two equivalent Mg(1), two equivalent Mg(2), four equivalent Mg(3), one Ce(2), and two equivalent Ce(1) atoms to form distorted MgCe3Mg9 cuboctahedra that share corners with five equivalent Mg(1)Ce2Mg10 cuboctahedra, corners with ten equivalent Mg(2)Ce3Mg9 cuboctahedra, edges with three equivalent Mg(1)Ce2Mg10 cuboctahedra, edges with five equivalent Mg(2)Ce3Mg9 cuboctahedra, faces with two equivalent Mg(1)Ce2Mg10 cuboctahedra, faces with eight equivalent Mg(2)Ce3Mg9 cuboctahedra, and faces with three equivalent Ce(2)Mg20 hexagonal bipyramids. In the third Mg site, Mg(3) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Mg(3), four equivalent Mg(2), one Ce(1), and one Ce(2) atom. In the fourth Mg site, Mg(4) is bonded in a 8-coordinate geometry to one Mg(4), three equivalent Mg(1), three equivalent Mg(2), and one Ce(2) atom. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a distorted hexagonal planar geometry to six equivalent Mg(3) and twelve equivalent Mg(2) atoms. In the second Ce site, Ce(2) is bonded to two equivalent Mg(4), six equivalent Mg(1), six equivalent Mg(2), and six equivalent Mg(3) atoms to form distorted CeMg20 hexagonal bipyramids that share corners with six equivalent Ce(2)Mg20 hexagonal bipyramids, faces with six equivalent Mg(1)Ce2Mg10 cuboctahedra, and faces with eighteen equivalent Mg(2)Ce3Mg9 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ce2Mg17
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.319
_cell_length_b   10.319
_cell_length_c   10.157
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   936.589
_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  0.000  0.250  1.0
  Ce  Ce1  1  0.000  0.000  0.750  1.0
  Ce  Ce2  1  0.667  0.333  0.250  1.0
  Ce  Ce3  1  0.333  0.667  0.750  1.0
  Mg  Mg4  1  0.500  0.000  0.500  1.0
  Mg  Mg5  1  0.500  0.500  0.500  1.0
  Mg  Mg6  1  0.835  0.165  0.498  1.0
  Mg  Mg7  1  0.330  0.165  0.002  1.0
  Mg  Mg8  1  0.165  0.330  0.502  1.0
  Mg  Mg9  1  0.667  0.662  0.750  1.0
  Mg  Mg10  1  0.667  0.333  0.895  1.0
  Mg  Mg11  1  0.333  0.667  0.395  1.0
  Mg  Mg12  1  0.670  0.835  0.998  1.0
  Mg  Mg13  1  0.338  0.333  0.750  1.0
  Mg  Mg14  1  0.005  0.338  0.250  1.0
  Mg  Mg15  1  0.835  0.165  0.002  1.0
  Mg  Mg16  1  0.662  0.995  0.250  1.0
  Mg  Mg17  1  0.995  0.662  0.750  1.0
  Mg  Mg18  1  0.330  0.165  0.498  1.0
  Mg  Mg19  1  0.835  0.670  0.498  1.0
  Mg  Mg20  1  0.165  0.330  0.998  1.0
  Mg  Mg21  1  0.835  0.670  0.002  1.0
  Mg  Mg22  1  0.667  0.333  0.605  1.0
  Mg  Mg23  1  0.670  0.835  0.502  1.0
  Mg  Mg24  1  0.000  0.500  0.000  1.0
  Mg  Mg25  1  0.333  0.995  0.250  1.0
  Mg  Mg26  1  0.333  0.338  0.250  1.0
  Mg  Mg27  1  0.333  0.667  0.105  1.0
  Mg  Mg28  1  0.165  0.835  0.502  1.0
  Mg  Mg29  1  0.005  0.667  0.250  1.0
  Mg  Mg30  1  0.667  0.005  0.750  1.0
  Mg  Mg31  1  0.165  0.835  0.998  1.0
  Mg  Mg32  1  0.662  0.667  0.250  1.0
  Mg  Mg33  1  0.500  0.500  0.000  1.0
  Mg  Mg34  1  0.995  0.333  0.750  1.0
  Mg  Mg35  1  0.338  0.005  0.750  1.0
  Mg  Mg36  1  0.000  0.500  0.500  1.0
  Mg  Mg37  1  0.500  0.000  0.000  1.0
[/CIF]
.