The compound described by Mg6LaY crystallizes in the trigonal R-3m space group. There are six inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted body-centered cubic geometry to four equivalent Mg(3), three equivalent La(1), and one Y(1) atom. In the second Mg site, Mg(2) is bonded in a body-centered cubic geometry to four equivalent Mg(3), one La(1), and three equivalent Y(1) atoms. In the third Mg site, Mg(3) is bonded in a 14-coordinate geometry to four equivalent Mg(1), four equivalent Mg(2), three equivalent La(1), and three equivalent Y(1) atoms. In the fourth Mg site, Mg(2) is bonded in a body-centered cubic geometry to four equivalent Mg(3), one La(1), and three equivalent Y(1) atoms. In the fifth Mg site, Mg(1) is bonded in a distorted body-centered cubic geometry to four equivalent Mg(3), three equivalent La(1), and one Y(1) atom. In the sixth Mg site, Mg(2) is bonded in a body-centered cubic geometry to four equivalent Mg(3), one La(1), and three equivalent Y(1) atoms. La(1) is bonded in a distorted body-centered cubic geometry to two equivalent Mg(2), six equivalent Mg(1), and six equivalent Mg(3) atoms. Y(1) is bonded in a distorted body-centered cubic geometry to two equivalent Mg(1), six equivalent Mg(2), and six equivalent Mg(3) atoms. is represented by the CIF file [CIF]
data_LaYMg6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.071
_cell_length_b   9.071
_cell_length_c   9.071
_cell_angle_alpha   33.469
_cell_angle_beta   33.469
_cell_angle_gamma   33.469
_symmetry_Int_Tables_number   1
_cell_volume   202.158
_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
  La  La0  1  0.000  0.000  0.000  1.0
  Y  Y1  1  0.500  0.500  0.500  1.0
  Mg  Mg2  1  0.623  0.623  0.623  1.0
  Mg  Mg3  1  0.127  0.127  0.127  1.0
  Mg  Mg4  1  0.873  0.873  0.873  1.0
  Mg  Mg5  1  0.377  0.377  0.377  1.0
  Mg  Mg6  1  0.249  0.249  0.249  1.0
  Mg  Mg7  1  0.751  0.751  0.751  1.0
[/CIF]
.
The compound described by Mg6LaY crystallizes in the trigonal R-3m space group. There are six inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted body-centered cubic geometry to four equivalent Mg(3), three equivalent La(1), and one Y(1) atom. In the second Mg site, Mg(2) is bonded in a body-centered cubic geometry to four equivalent Mg(3), one La(1), and three equivalent Y(1) atoms. In the third Mg site, Mg(3) is bonded in a 14-coordinate geometry to four equivalent Mg(1), four equivalent Mg(2), three equivalent La(1), and three equivalent Y(1) atoms. In the fourth Mg site, Mg(2) is bonded in a body-centered cubic geometry to four equivalent Mg(3), one La(1), and three equivalent Y(1) atoms. In the fifth Mg site, Mg(1) is bonded in a distorted body-centered cubic geometry to four equivalent Mg(3), three equivalent La(1), and one Y(1) atom. In the sixth Mg site, Mg(2) is bonded in a body-centered cubic geometry to four equivalent Mg(3), one La(1), and three equivalent Y(1) atoms. La(1) is bonded in a distorted body-centered cubic geometry to two equivalent Mg(2), six equivalent Mg(1), and six equivalent Mg(3) atoms. Y(1) is bonded in a distorted body-centered cubic geometry to two equivalent Mg(1), six equivalent Mg(2), and six equivalent Mg(3) atoms. is represented by the CIF file [CIF]
data_LaYMg6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.071
_cell_length_b   9.071
_cell_length_c   9.071
_cell_angle_alpha   33.469
_cell_angle_beta   33.469
_cell_angle_gamma   33.469
_symmetry_Int_Tables_number   1
_cell_volume   202.158
_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
  La  La0  1  0.000  0.000  0.000  1.0
  Y  Y1  1  0.500  0.500  0.500  1.0
  Mg  Mg2  1  0.623  0.623  0.623  1.0
  Mg  Mg3  1  0.127  0.127  0.127  1.0
  Mg  Mg4  1  0.873  0.873  0.873  1.0
  Mg  Mg5  1  0.377  0.377  0.377  1.0
  Mg  Mg6  1  0.249  0.249  0.249  1.0
  Mg  Mg7  1  0.751  0.751  0.751  1.0
[/CIF]
.