The crystal structure described by MgY2 is beta-derived structured and crystallizes in the monoclinic Cm 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), one Y(3), two equivalent Y(1), two equivalent Y(4), and three 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 two equivalent Y(2)Y7Mg5 cuboctahedra, edges with three equivalent Mg(2)Y8Mg4 cuboctahedra, edges with three equivalent Y(4)Y8Mg4 cuboctahedra, edges with four equivalent Y(3)Y8Mg4 cuboctahedra, edges with six equivalent Y(1)Y9Mg3 cuboctahedra, faces with two equivalent Mg(1)Y8Mg4 cuboctahedra, faces with three equivalent Mg(2)Y8Mg4 cuboctahedra, faces with three equivalent Y(4)Y8Mg4 cuboctahedra, faces with three equivalent Y(1)Y9Mg3 cuboctahedra, faces with four equivalent Y(3)Y8Mg4 cuboctahedra, and faces with five equivalent Y(2)Y7Mg5 cuboctahedra. In the second Mg site, Mg(2) is bonded to two equivalent Mg(1), two equivalent Mg(2), one Y(1), two equivalent Y(2), two equivalent Y(4), and three 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 two equivalent Y(3)Y8Mg4 cuboctahedra, edges with three equivalent Mg(1)Y8Mg4 cuboctahedra, edges with three equivalent Y(4)Y8Mg4 cuboctahedra, edges with four equivalent Y(1)Y9Mg3 cuboctahedra, edges with six equivalent Y(2)Y7Mg5 cuboctahedra, faces with two equivalent Mg(2)Y8Mg4 cuboctahedra, faces with three equivalent Mg(1)Y8Mg4 cuboctahedra, faces with three equivalent Y(2)Y7Mg5 cuboctahedra, faces with three equivalent Y(4)Y8Mg4 cuboctahedra, faces with four equivalent Y(1)Y9Mg3 cuboctahedra, and faces with five equivalent Y(3)Y8Mg4 cuboctahedra. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded to one Mg(2), two equivalent Mg(1), two equivalent Y(1), two equivalent Y(2), two equivalent Y(3), and three equivalent Y(4) atoms to form YY9Mg3 cuboctahedra that share corners with six equivalent Y(2)Y7Mg5 cuboctahedra, corners with six equivalent Y(3)Y8Mg4 cuboctahedra, corners with six equivalent Y(1)Y9Mg3 cuboctahedra, edges with two equivalent Y(4)Y8Mg4 cuboctahedra, edges with three equivalent Y(2)Y7Mg5 cuboctahedra, edges with three equivalent Y(3)Y8Mg4 cuboctahedra, edges with four equivalent Mg(2)Y8Mg4 cuboctahedra, edges with six equivalent Mg(1)Y8Mg4 cuboctahedra, faces with two equivalent Y(1)Y9Mg3 cuboctahedra, faces with three equivalent Mg(1)Y8Mg4 cuboctahedra, faces with three equivalent Y(2)Y7Mg5 cuboctahedra, faces with three equivalent Y(3)Y8Mg4 cuboctahedra, faces with four equivalent Mg(2)Y8Mg4 cuboctahedra, and faces with five equivalent Y(4)Y8Mg4 cuboctahedra. In the second Y site, Y(2) is bonded to two equivalent Mg(2), three equivalent Mg(1), one Y(4), two equivalent Y(1), two equivalent Y(2), and two equivalent Y(3) atoms to form YY7Mg5 cuboctahedra that share corners with six equivalent Y(2)Y7Mg5 cuboctahedra, corners with six equivalent Y(3)Y8Mg4 cuboctahedra, corners with six equivalent Y(1)Y9Mg3 cuboctahedra, edges with two equivalent Mg(1)Y8Mg4 cuboctahedra, edges with three equivalent Y(3)Y8Mg4 cuboctahedra, edges with three equivalent Y(1)Y9Mg3 cuboctahedra, edges with four equivalent Y(4)Y8Mg4 cuboctahedra, edges with six equivalent Mg(2)Y8Mg4 cuboctahedra, faces with two equivalent Y(2)Y7Mg5 cuboctahedra, faces with three equivalent Mg(2)Y8Mg4 cuboctahedra, faces with three equivalent Y(3)Y8Mg4 cuboctahedra, faces with three equivalent Y(1)Y9Mg3 cuboctahedra, faces with four equivalent Y(4)Y8Mg4 cuboctahedra, and faces with five equivalent Mg(1)Y8Mg4 cuboctahedra. In the third Y site, Y(3) is bonded to one Mg(1), three 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(2)Y7Mg5 cuboctahedra, corners with six equivalent Y(3)Y8Mg4 cuboctahedra, corners with six equivalent Y(1)Y9Mg3 cuboctahedra, edges with two equivalent Mg(2)Y8Mg4 cuboctahedra, edges with three equivalent Y(2)Y7Mg5 cuboctahedra, edges with three equivalent Y(1)Y9Mg3 cuboctahedra, edges with four equivalent Mg(1)Y8Mg4 cuboctahedra, edges with six equivalent Y(4)Y8Mg4 cuboctahedra, faces with two equivalent Y(3)Y8Mg4 cuboctahedra, faces with three equivalent Y(2)Y7Mg5 cuboctahedra, faces with three equivalent Y(4)Y8Mg4 cuboctahedra, faces with three equivalent Y(1)Y9Mg3 cuboctahedra, faces with four equivalent Mg(1)Y8Mg4 cuboctahedra, and faces with five equivalent Mg(2)Y8Mg4 cuboctahedra. In the fourth Y site, Y(4) is bonded to two equivalent Mg(1), two equivalent Mg(2), one Y(2), two equivalent Y(3), two equivalent Y(4), and three 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 two equivalent Y(1)Y9Mg3 cuboctahedra, edges with three equivalent Mg(1)Y8Mg4 cuboctahedra, edges with three equivalent Mg(2)Y8Mg4 cuboctahedra, edges with four equivalent Y(2)Y7Mg5 cuboctahedra, edges with six equivalent Y(3)Y8Mg4 cuboctahedra, faces with two equivalent Y(4)Y8Mg4 cuboctahedra, faces with three equivalent Mg(1)Y8Mg4 cuboctahedra, faces with three equivalent Mg(2)Y8Mg4 cuboctahedra, faces with three equivalent Y(3)Y8Mg4 cuboctahedra, faces with four equivalent Y(2)Y7Mg5 cuboctahedra, and faces with five equivalent Y(1)Y9Mg3 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Y2Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.586
_cell_length_b   6.586
_cell_length_c   8.285
_cell_angle_alpha   74.693
_cell_angle_beta   74.693
_cell_angle_gamma   31.007
_symmetry_Int_Tables_number   1
_cell_volume   178.046
_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  0.011  0.011  0.016  1.0
  Y  Y1  1  0.323  0.323  0.334  1.0
  Y  Y2  1  0.658  0.658  0.669  1.0
  Y  Y3  1  0.291  0.291  0.931  1.0
  Mg  Mg4  1  0.609  0.609  0.285  1.0
  Mg  Mg5  1  0.942  0.942  0.598  1.0
[/CIF]
.
The crystal structure described by MgY2 is beta-derived structured and crystallizes in the monoclinic Cm 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), one Y(3), two equivalent Y(1), two equivalent Y(4), and three 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 two equivalent Y(2)Y7Mg5 cuboctahedra, edges with three equivalent Mg(2)Y8Mg4 cuboctahedra, edges with three equivalent Y(4)Y8Mg4 cuboctahedra, edges with four equivalent Y(3)Y8Mg4 cuboctahedra, edges with six equivalent Y(1)Y9Mg3 cuboctahedra, faces with two equivalent Mg(1)Y8Mg4 cuboctahedra, faces with three equivalent Mg(2)Y8Mg4 cuboctahedra, faces with three equivalent Y(4)Y8Mg4 cuboctahedra, faces with three equivalent Y(1)Y9Mg3 cuboctahedra, faces with four equivalent Y(3)Y8Mg4 cuboctahedra, and faces with five equivalent Y(2)Y7Mg5 cuboctahedra. In the second Mg site, Mg(2) is bonded to two equivalent Mg(1), two equivalent Mg(2), one Y(1), two equivalent Y(2), two equivalent Y(4), and three 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 two equivalent Y(3)Y8Mg4 cuboctahedra, edges with three equivalent Mg(1)Y8Mg4 cuboctahedra, edges with three equivalent Y(4)Y8Mg4 cuboctahedra, edges with four equivalent Y(1)Y9Mg3 cuboctahedra, edges with six equivalent Y(2)Y7Mg5 cuboctahedra, faces with two equivalent Mg(2)Y8Mg4 cuboctahedra, faces with three equivalent Mg(1)Y8Mg4 cuboctahedra, faces with three equivalent Y(2)Y7Mg5 cuboctahedra, faces with three equivalent Y(4)Y8Mg4 cuboctahedra, faces with four equivalent Y(1)Y9Mg3 cuboctahedra, and faces with five equivalent Y(3)Y8Mg4 cuboctahedra. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded to one Mg(2), two equivalent Mg(1), two equivalent Y(1), two equivalent Y(2), two equivalent Y(3), and three equivalent Y(4) atoms to form YY9Mg3 cuboctahedra that share corners with six equivalent Y(2)Y7Mg5 cuboctahedra, corners with six equivalent Y(3)Y8Mg4 cuboctahedra, corners with six equivalent Y(1)Y9Mg3 cuboctahedra, edges with two equivalent Y(4)Y8Mg4 cuboctahedra, edges with three equivalent Y(2)Y7Mg5 cuboctahedra, edges with three equivalent Y(3)Y8Mg4 cuboctahedra, edges with four equivalent Mg(2)Y8Mg4 cuboctahedra, edges with six equivalent Mg(1)Y8Mg4 cuboctahedra, faces with two equivalent Y(1)Y9Mg3 cuboctahedra, faces with three equivalent Mg(1)Y8Mg4 cuboctahedra, faces with three equivalent Y(2)Y7Mg5 cuboctahedra, faces with three equivalent Y(3)Y8Mg4 cuboctahedra, faces with four equivalent Mg(2)Y8Mg4 cuboctahedra, and faces with five equivalent Y(4)Y8Mg4 cuboctahedra. In the second Y site, Y(2) is bonded to two equivalent Mg(2), three equivalent Mg(1), one Y(4), two equivalent Y(1), two equivalent Y(2), and two equivalent Y(3) atoms to form YY7Mg5 cuboctahedra that share corners with six equivalent Y(2)Y7Mg5 cuboctahedra, corners with six equivalent Y(3)Y8Mg4 cuboctahedra, corners with six equivalent Y(1)Y9Mg3 cuboctahedra, edges with two equivalent Mg(1)Y8Mg4 cuboctahedra, edges with three equivalent Y(3)Y8Mg4 cuboctahedra, edges with three equivalent Y(1)Y9Mg3 cuboctahedra, edges with four equivalent Y(4)Y8Mg4 cuboctahedra, edges with six equivalent Mg(2)Y8Mg4 cuboctahedra, faces with two equivalent Y(2)Y7Mg5 cuboctahedra, faces with three equivalent Mg(2)Y8Mg4 cuboctahedra, faces with three equivalent Y(3)Y8Mg4 cuboctahedra, faces with three equivalent Y(1)Y9Mg3 cuboctahedra, faces with four equivalent Y(4)Y8Mg4 cuboctahedra, and faces with five equivalent Mg(1)Y8Mg4 cuboctahedra. In the third Y site, Y(3) is bonded to one Mg(1), three 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(2)Y7Mg5 cuboctahedra, corners with six equivalent Y(3)Y8Mg4 cuboctahedra, corners with six equivalent Y(1)Y9Mg3 cuboctahedra, edges with two equivalent Mg(2)Y8Mg4 cuboctahedra, edges with three equivalent Y(2)Y7Mg5 cuboctahedra, edges with three equivalent Y(1)Y9Mg3 cuboctahedra, edges with four equivalent Mg(1)Y8Mg4 cuboctahedra, edges with six equivalent Y(4)Y8Mg4 cuboctahedra, faces with two equivalent Y(3)Y8Mg4 cuboctahedra, faces with three equivalent Y(2)Y7Mg5 cuboctahedra, faces with three equivalent Y(4)Y8Mg4 cuboctahedra, faces with three equivalent Y(1)Y9Mg3 cuboctahedra, faces with four equivalent Mg(1)Y8Mg4 cuboctahedra, and faces with five equivalent Mg(2)Y8Mg4 cuboctahedra. In the fourth Y site, Y(4) is bonded to two equivalent Mg(1), two equivalent Mg(2), one Y(2), two equivalent Y(3), two equivalent Y(4), and three 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 two equivalent Y(1)Y9Mg3 cuboctahedra, edges with three equivalent Mg(1)Y8Mg4 cuboctahedra, edges with three equivalent Mg(2)Y8Mg4 cuboctahedra, edges with four equivalent Y(2)Y7Mg5 cuboctahedra, edges with six equivalent Y(3)Y8Mg4 cuboctahedra, faces with two equivalent Y(4)Y8Mg4 cuboctahedra, faces with three equivalent Mg(1)Y8Mg4 cuboctahedra, faces with three equivalent Mg(2)Y8Mg4 cuboctahedra, faces with three equivalent Y(3)Y8Mg4 cuboctahedra, faces with four equivalent Y(2)Y7Mg5 cuboctahedra, and faces with five equivalent Y(1)Y9Mg3 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Y2Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.586
_cell_length_b   6.586
_cell_length_c   8.285
_cell_angle_alpha   74.693
_cell_angle_beta   74.693
_cell_angle_gamma   31.007
_symmetry_Int_Tables_number   1
_cell_volume   178.046
_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  0.011  0.011  0.016  1.0
  Y  Y1  1  0.323  0.323  0.334  1.0
  Y  Y2  1  0.658  0.658  0.669  1.0
  Y  Y3  1  0.291  0.291  0.931  1.0
  Mg  Mg4  1  0.609  0.609  0.285  1.0
  Mg  Mg5  1  0.942  0.942  0.598  1.0
[/CIF]
.