The material described by MgY crystallizes in the trigonal R-3m space group. Mg(1) is bonded to six equivalent Mg(1) and six equivalent Y(1) atoms to form MgY6Mg6 cuboctahedra that share corners with twelve equivalent Mg(1)Y6Mg6 cuboctahedra, edges with twelve equivalent Mg(1)Y6Mg6 cuboctahedra, edges with twelve equivalent Y(1)Y6Mg6 cuboctahedra, faces with six equivalent Mg(1)Y6Mg6 cuboctahedra, and faces with twelve equivalent Y(1)Y6Mg6 cuboctahedra. Y(1) is bonded to six equivalent Mg(1) and six equivalent Y(1) atoms to form YY6Mg6 cuboctahedra that share corners with twelve equivalent Y(1)Y6Mg6 cuboctahedra, edges with twelve equivalent Mg(1)Y6Mg6 cuboctahedra, edges with twelve equivalent Y(1)Y6Mg6 cuboctahedra, faces with six equivalent Y(1)Y6Mg6 cuboctahedra, and faces with twelve equivalent Mg(1)Y6Mg6 cuboctahedra. is represented by the CIF file [CIF]
data_YMg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.893
_cell_length_b   5.893
_cell_length_c   5.893
_cell_angle_alpha   34.215
_cell_angle_beta   34.215
_cell_angle_gamma   34.215
_symmetry_Int_Tables_number   1
_cell_volume   57.689
_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  0.000  0.000  0.000  1.0
[/CIF]
.
The material described by MgY crystallizes in the trigonal R-3m space group. Mg(1) is bonded to six equivalent Mg(1) and six equivalent Y(1) atoms to form MgY6Mg6 cuboctahedra that share corners with twelve equivalent Mg(1)Y6Mg6 cuboctahedra, edges with twelve equivalent Mg(1)Y6Mg6 cuboctahedra, edges with twelve equivalent Y(1)Y6Mg6 cuboctahedra, faces with six equivalent Mg(1)Y6Mg6 cuboctahedra, and faces with twelve equivalent Y(1)Y6Mg6 cuboctahedra. Y(1) is bonded to six equivalent Mg(1) and six equivalent Y(1) atoms to form YY6Mg6 cuboctahedra that share corners with twelve equivalent Y(1)Y6Mg6 cuboctahedra, edges with twelve equivalent Mg(1)Y6Mg6 cuboctahedra, edges with twelve equivalent Y(1)Y6Mg6 cuboctahedra, faces with six equivalent Y(1)Y6Mg6 cuboctahedra, and faces with twelve equivalent Mg(1)Y6Mg6 cuboctahedra. is represented by the CIF file [CIF]
data_YMg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.893
_cell_length_b   5.893
_cell_length_c   5.893
_cell_angle_alpha   34.215
_cell_angle_beta   34.215
_cell_angle_gamma   34.215
_symmetry_Int_Tables_number   1
_cell_volume   57.689
_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  0.000  0.000  0.000  1.0
[/CIF]
.