The material described by MgY2 crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(1), two equivalent Mg(2), two equivalent Y(1), two equivalent Y(4), and four equivalent Y(3) atoms to form distorted MgY8Mg4 cuboctahedra that share corners with six equivalent Mg(1)Y8Mg4 cuboctahedra, corners with six equivalent Mg(2)Y8Mg4 cuboctahedra, corners with six equivalent Y(4)Y8Mg4 cuboctahedra, edges with three equivalent Mg(2)Y8Mg4 cuboctahedra, edges with three equivalent Y(4)Y8Mg4 cuboctahedra, edges with four equivalent Y(3)Y6Mg6 cuboctahedra, edges with eight equivalent Y(2)Y8Mg4 cuboctahedra, faces with two equivalent Mg(2)Y8Mg4 cuboctahedra, faces with two equivalent Y(2)Y8Mg4 cuboctahedra, faces with two equivalent Y(4)Y8Mg4 cuboctahedra, faces with four equivalent Mg(1)Y8Mg4 cuboctahedra, faces with four equivalent Y(3)Y6Mg6 cuboctahedra, and faces with six equivalent Y(1)Y10Mg2 cuboctahedra. In the second Mg site, Mg(2) is bonded to two equivalent Mg(1), two equivalent Mg(2), two equivalent Y(3), two equivalent Y(4), and four equivalent Y(2) atoms to form distorted MgY8Mg4 cuboctahedra that share corners with six equivalent Mg(1)Y8Mg4 cuboctahedra, corners with six equivalent Mg(2)Y8Mg4 cuboctahedra, corners with six equivalent Y(4)Y8Mg4 cuboctahedra, edges with three equivalent Mg(1)Y8Mg4 cuboctahedra, edges with three equivalent Y(4)Y8Mg4 cuboctahedra, edges with four equivalent Y(2)Y8Mg4 cuboctahedra, edges with eight equivalent Y(1)Y10Mg2 cuboctahedra, faces with two equivalent Mg(1)Y8Mg4 cuboctahedra, faces with two equivalent Y(1)Y10Mg2 cuboctahedra, faces with two equivalent Y(4)Y8Mg4 cuboctahedra, faces with four equivalent Mg(2)Y8Mg4 cuboctahedra, faces with four equivalent Y(2)Y8Mg4 cuboctahedra, and faces with six equivalent Y(3)Y6Mg6 cuboctahedra. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded to two equivalent Mg(1), two equivalent Y(1), two equivalent Y(2), two equivalent Y(3), and four equivalent Y(4) atoms to form YY10Mg2 cuboctahedra that share corners with six equivalent Y(1)Y10Mg2 cuboctahedra, corners with six equivalent Y(3)Y6Mg6 cuboctahedra, corners with six equivalent Y(2)Y8Mg4 cuboctahedra, edges with three equivalent Y(3)Y6Mg6 cuboctahedra, edges with three equivalent Y(2)Y8Mg4 cuboctahedra, edges with four equivalent Y(4)Y8Mg4 cuboctahedra, edges with eight equivalent Mg(2)Y8Mg4 cuboctahedra, faces with two equivalent Mg(2)Y8Mg4 cuboctahedra, faces with two equivalent Y(3)Y6Mg6 cuboctahedra, faces with two equivalent Y(2)Y8Mg4 cuboctahedra, faces with four equivalent Y(1)Y10Mg2 cuboctahedra, faces with four equivalent Y(4)Y8Mg4 cuboctahedra, and faces with six equivalent Mg(1)Y8Mg4 cuboctahedra. In the second Y site, Y(2) is bonded to four equivalent Mg(2), two equivalent Y(1), two equivalent Y(2), two equivalent Y(3), and two equivalent Y(4) atoms to form YY8Mg4 cuboctahedra that share corners with six equivalent Y(1)Y10Mg2 cuboctahedra, corners with six equivalent Y(3)Y6Mg6 cuboctahedra, corners with six equivalent Y(2)Y8Mg4 cuboctahedra, edges with three equivalent Y(1)Y10Mg2 cuboctahedra, edges with three equivalent Y(3)Y6Mg6 cuboctahedra, edges with four equivalent Mg(2)Y8Mg4 cuboctahedra, edges with eight equivalent Mg(1)Y8Mg4 cuboctahedra, faces with two equivalent Mg(1)Y8Mg4 cuboctahedra, faces with two equivalent Y(1)Y10Mg2 cuboctahedra, faces with two equivalent Y(3)Y6Mg6 cuboctahedra, faces with four equivalent Mg(2)Y8Mg4 cuboctahedra, faces with four equivalent Y(2)Y8Mg4 cuboctahedra, and faces with six equivalent Y(4)Y8Mg4 cuboctahedra. In the third Y site, Y(3) is bonded to two equivalent Mg(2), four equivalent Mg(1), two equivalent Y(1), two equivalent Y(2), and two equivalent Y(3) atoms to form YY6Mg6 cuboctahedra that share corners with six equivalent Y(1)Y10Mg2 cuboctahedra, corners with six equivalent Y(3)Y6Mg6 cuboctahedra, corners with six equivalent Y(2)Y8Mg4 cuboctahedra, edges with three equivalent Y(1)Y10Mg2 cuboctahedra, edges with three equivalent Y(2)Y8Mg4 cuboctahedra, edges with four equivalent Mg(1)Y8Mg4 cuboctahedra, edges with eight equivalent Y(4)Y8Mg4 cuboctahedra, faces with two equivalent Y(1)Y10Mg2 cuboctahedra, faces with two equivalent Y(2)Y8Mg4 cuboctahedra, faces with two equivalent Y(4)Y8Mg4 cuboctahedra, faces with four equivalent Mg(1)Y8Mg4 cuboctahedra, faces with four equivalent Y(3)Y6Mg6 cuboctahedra, and faces with six equivalent Mg(2)Y8Mg4 cuboctahedra. In the fourth Y site, Y(4) is bonded to two equivalent Mg(1), two equivalent Mg(2), two equivalent Y(2), two equivalent Y(4), and four equivalent Y(1) atoms to form YY8Mg4 cuboctahedra that share corners with six equivalent Mg(1)Y8Mg4 cuboctahedra, corners with six equivalent Mg(2)Y8Mg4 cuboctahedra, corners with six equivalent Y(4)Y8Mg4 cuboctahedra, edges with three equivalent Mg(1)Y8Mg4 cuboctahedra, edges with three equivalent Mg(2)Y8Mg4 cuboctahedra, edges with four equivalent Y(1)Y10Mg2 cuboctahedra, edges with eight equivalent Y(3)Y6Mg6 cuboctahedra, faces with two equivalent Mg(1)Y8Mg4 cuboctahedra, faces with two equivalent Mg(2)Y8Mg4 cuboctahedra, faces with two equivalent Y(3)Y6Mg6 cuboctahedra, faces with four equivalent Y(1)Y10Mg2 cuboctahedra, faces with four equivalent Y(4)Y8Mg4 cuboctahedra, and faces with six equivalent Y(2)Y8Mg4 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Y2Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.296
_cell_length_b   9.296
_cell_length_c   5.608
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   158.220
_symmetry_Int_Tables_number   1
_cell_volume   179.810
_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
  Y  Y0  1  0.003  0.997  0.500  1.0
  Y  Y1  1  0.331  0.669  0.500  1.0
  Y  Y2  1  0.664  0.336  0.500  1.0
  Y  Y3  1  0.448  0.552  0.000  1.0
  Mg  Mg4  1  0.111  0.889  0.000  1.0
  Mg  Mg5  1  0.776  0.224  0.000  1.0
[/CIF]
.
The material described by MgY2 crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Mg(1), two equivalent Mg(2), two equivalent Y(1), two equivalent Y(4), and four equivalent Y(3) atoms to form distorted MgY8Mg4 cuboctahedra that share corners with six equivalent Mg(1)Y8Mg4 cuboctahedra, corners with six equivalent Mg(2)Y8Mg4 cuboctahedra, corners with six equivalent Y(4)Y8Mg4 cuboctahedra, edges with three equivalent Mg(2)Y8Mg4 cuboctahedra, edges with three equivalent Y(4)Y8Mg4 cuboctahedra, edges with four equivalent Y(3)Y6Mg6 cuboctahedra, edges with eight equivalent Y(2)Y8Mg4 cuboctahedra, faces with two equivalent Mg(2)Y8Mg4 cuboctahedra, faces with two equivalent Y(2)Y8Mg4 cuboctahedra, faces with two equivalent Y(4)Y8Mg4 cuboctahedra, faces with four equivalent Mg(1)Y8Mg4 cuboctahedra, faces with four equivalent Y(3)Y6Mg6 cuboctahedra, and faces with six equivalent Y(1)Y10Mg2 cuboctahedra. In the second Mg site, Mg(2) is bonded to two equivalent Mg(1), two equivalent Mg(2), two equivalent Y(3), two equivalent Y(4), and four equivalent Y(2) atoms to form distorted MgY8Mg4 cuboctahedra that share corners with six equivalent Mg(1)Y8Mg4 cuboctahedra, corners with six equivalent Mg(2)Y8Mg4 cuboctahedra, corners with six equivalent Y(4)Y8Mg4 cuboctahedra, edges with three equivalent Mg(1)Y8Mg4 cuboctahedra, edges with three equivalent Y(4)Y8Mg4 cuboctahedra, edges with four equivalent Y(2)Y8Mg4 cuboctahedra, edges with eight equivalent Y(1)Y10Mg2 cuboctahedra, faces with two equivalent Mg(1)Y8Mg4 cuboctahedra, faces with two equivalent Y(1)Y10Mg2 cuboctahedra, faces with two equivalent Y(4)Y8Mg4 cuboctahedra, faces with four equivalent Mg(2)Y8Mg4 cuboctahedra, faces with four equivalent Y(2)Y8Mg4 cuboctahedra, and faces with six equivalent Y(3)Y6Mg6 cuboctahedra. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded to two equivalent Mg(1), two equivalent Y(1), two equivalent Y(2), two equivalent Y(3), and four equivalent Y(4) atoms to form YY10Mg2 cuboctahedra that share corners with six equivalent Y(1)Y10Mg2 cuboctahedra, corners with six equivalent Y(3)Y6Mg6 cuboctahedra, corners with six equivalent Y(2)Y8Mg4 cuboctahedra, edges with three equivalent Y(3)Y6Mg6 cuboctahedra, edges with three equivalent Y(2)Y8Mg4 cuboctahedra, edges with four equivalent Y(4)Y8Mg4 cuboctahedra, edges with eight equivalent Mg(2)Y8Mg4 cuboctahedra, faces with two equivalent Mg(2)Y8Mg4 cuboctahedra, faces with two equivalent Y(3)Y6Mg6 cuboctahedra, faces with two equivalent Y(2)Y8Mg4 cuboctahedra, faces with four equivalent Y(1)Y10Mg2 cuboctahedra, faces with four equivalent Y(4)Y8Mg4 cuboctahedra, and faces with six equivalent Mg(1)Y8Mg4 cuboctahedra. In the second Y site, Y(2) is bonded to four equivalent Mg(2), two equivalent Y(1), two equivalent Y(2), two equivalent Y(3), and two equivalent Y(4) atoms to form YY8Mg4 cuboctahedra that share corners with six equivalent Y(1)Y10Mg2 cuboctahedra, corners with six equivalent Y(3)Y6Mg6 cuboctahedra, corners with six equivalent Y(2)Y8Mg4 cuboctahedra, edges with three equivalent Y(1)Y10Mg2 cuboctahedra, edges with three equivalent Y(3)Y6Mg6 cuboctahedra, edges with four equivalent Mg(2)Y8Mg4 cuboctahedra, edges with eight equivalent Mg(1)Y8Mg4 cuboctahedra, faces with two equivalent Mg(1)Y8Mg4 cuboctahedra, faces with two equivalent Y(1)Y10Mg2 cuboctahedra, faces with two equivalent Y(3)Y6Mg6 cuboctahedra, faces with four equivalent Mg(2)Y8Mg4 cuboctahedra, faces with four equivalent Y(2)Y8Mg4 cuboctahedra, and faces with six equivalent Y(4)Y8Mg4 cuboctahedra. In the third Y site, Y(3) is bonded to two equivalent Mg(2), four equivalent Mg(1), two equivalent Y(1), two equivalent Y(2), and two equivalent Y(3) atoms to form YY6Mg6 cuboctahedra that share corners with six equivalent Y(1)Y10Mg2 cuboctahedra, corners with six equivalent Y(3)Y6Mg6 cuboctahedra, corners with six equivalent Y(2)Y8Mg4 cuboctahedra, edges with three equivalent Y(1)Y10Mg2 cuboctahedra, edges with three equivalent Y(2)Y8Mg4 cuboctahedra, edges with four equivalent Mg(1)Y8Mg4 cuboctahedra, edges with eight equivalent Y(4)Y8Mg4 cuboctahedra, faces with two equivalent Y(1)Y10Mg2 cuboctahedra, faces with two equivalent Y(2)Y8Mg4 cuboctahedra, faces with two equivalent Y(4)Y8Mg4 cuboctahedra, faces with four equivalent Mg(1)Y8Mg4 cuboctahedra, faces with four equivalent Y(3)Y6Mg6 cuboctahedra, and faces with six equivalent Mg(2)Y8Mg4 cuboctahedra. In the fourth Y site, Y(4) is bonded to two equivalent Mg(1), two equivalent Mg(2), two equivalent Y(2), two equivalent Y(4), and four equivalent Y(1) atoms to form YY8Mg4 cuboctahedra that share corners with six equivalent Mg(1)Y8Mg4 cuboctahedra, corners with six equivalent Mg(2)Y8Mg4 cuboctahedra, corners with six equivalent Y(4)Y8Mg4 cuboctahedra, edges with three equivalent Mg(1)Y8Mg4 cuboctahedra, edges with three equivalent Mg(2)Y8Mg4 cuboctahedra, edges with four equivalent Y(1)Y10Mg2 cuboctahedra, edges with eight equivalent Y(3)Y6Mg6 cuboctahedra, faces with two equivalent Mg(1)Y8Mg4 cuboctahedra, faces with two equivalent Mg(2)Y8Mg4 cuboctahedra, faces with two equivalent Y(3)Y6Mg6 cuboctahedra, faces with four equivalent Y(1)Y10Mg2 cuboctahedra, faces with four equivalent Y(4)Y8Mg4 cuboctahedra, and faces with six equivalent Y(2)Y8Mg4 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Y2Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.296
_cell_length_b   9.296
_cell_length_c   5.608
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   158.220
_symmetry_Int_Tables_number   1
_cell_volume   179.810
_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
  Y  Y0  1  0.003  0.997  0.500  1.0
  Y  Y1  1  0.331  0.669  0.500  1.0
  Y  Y2  1  0.664  0.336  0.500  1.0
  Y  Y3  1  0.448  0.552  0.000  1.0
  Mg  Mg4  1  0.111  0.889  0.000  1.0
  Mg  Mg5  1  0.776  0.224  0.000  1.0
[/CIF]
.