The structure described by Mg5Y crystallizes in the monoclinic C2/m space group. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Mg(3), three equivalent Mg(2), and three equivalent Y(1) atoms. In the second Mg site, Mg(2) is bonded in a 9-coordinate geometry to two equivalent Mg(2), two equivalent Mg(3), three equivalent Mg(1), and two equivalent Y(1) atoms. In the third Mg site, Mg(3) is bonded in a distorted q6 geometry to four equivalent Mg(1), four equivalent Mg(2), and two equivalent Y(1) atoms. Y(1) is bonded in a 14-coordinate geometry to two equivalent Mg(3), four equivalent Mg(2), six equivalent Mg(1), and two equivalent Y(1) atoms. is represented by the CIF file [CIF]
data_YMg5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.230
_cell_length_b   6.230
_cell_length_c   7.033
_cell_angle_alpha   72.951
_cell_angle_beta   72.951
_cell_angle_gamma   34.335
_symmetry_Int_Tables_number   1
_cell_volume   146.548
_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
  Y  Y0  1  0.500  0.500  0.500  1.0
  Mg  Mg1  1  0.176  0.176  0.671  1.0
  Mg  Mg2  1  0.827  0.827  0.846  1.0
  Mg  Mg3  1  0.500  0.500  0.000  1.0
  Mg  Mg4  1  0.173  0.173  0.154  1.0
  Mg  Mg5  1  0.824  0.824  0.329  1.0
[/CIF]
.
The structure described by Mg5Y crystallizes in the monoclinic C2/m space group. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Mg(3), three equivalent Mg(2), and three equivalent Y(1) atoms. In the second Mg site, Mg(2) is bonded in a 9-coordinate geometry to two equivalent Mg(2), two equivalent Mg(3), three equivalent Mg(1), and two equivalent Y(1) atoms. In the third Mg site, Mg(3) is bonded in a distorted q6 geometry to four equivalent Mg(1), four equivalent Mg(2), and two equivalent Y(1) atoms. Y(1) is bonded in a 14-coordinate geometry to two equivalent Mg(3), four equivalent Mg(2), six equivalent Mg(1), and two equivalent Y(1) atoms. is represented by the CIF file [CIF]
data_YMg5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.230
_cell_length_b   6.230
_cell_length_c   7.033
_cell_angle_alpha   72.951
_cell_angle_beta   72.951
_cell_angle_gamma   34.335
_symmetry_Int_Tables_number   1
_cell_volume   146.548
_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
  Y  Y0  1  0.500  0.500  0.500  1.0
  Mg  Mg1  1  0.176  0.176  0.671  1.0
  Mg  Mg2  1  0.827  0.827  0.846  1.0
  Mg  Mg3  1  0.500  0.500  0.000  1.0
  Mg  Mg4  1  0.173  0.173  0.154  1.0
  Mg  Mg5  1  0.824  0.824  0.329  1.0
[/CIF]
.