The structure described by MgY2 crystallizes in the orthorhombic Cmcm space group. Mg(1) is bonded in a 10-coordinate geometry to four equivalent Mg(1), two equivalent Y(2), and four equivalent Y(1) atoms. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to four equivalent Mg(1), two equivalent Y(1), and six equivalent Y(2) atoms to form distorted YY8Mg4 cuboctahedra that share corners with six equivalent Y(2)Y10Mg2 cuboctahedra, corners with six equivalent Y(1)Y8Mg4 cuboctahedra, edges with seven equivalent Y(2)Y10Mg2 cuboctahedra, edges with eight equivalent Y(1)Y8Mg4 cuboctahedra, faces with six equivalent Y(2)Y10Mg2 cuboctahedra, and faces with six equivalent Y(1)Y8Mg4 cuboctahedra. In the second Y site, Y(2) is bonded to two equivalent Mg(1), four equivalent Y(2), and six equivalent Y(1) atoms to form distorted YY10Mg2 cuboctahedra that share corners with six equivalent Y(2)Y10Mg2 cuboctahedra, corners with six equivalent Y(1)Y8Mg4 cuboctahedra, edges with seven equivalent Y(1)Y8Mg4 cuboctahedra, faces with six equivalent Y(1)Y8Mg4 cuboctahedra, and faces with ten equivalent Y(2)Y10Mg2 cuboctahedra. is represented by the CIF card [CIF]
data_Y2Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.911
_cell_length_b   8.911
_cell_length_c   5.575
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   155.925
_symmetry_Int_Tables_number   1
_cell_volume   180.599
_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  0.115  0.885  0.250  1.0
  Y  Y1  1  0.440  0.560  0.250  1.0
  Y  Y2  1  0.560  0.440  0.750  1.0
  Y  Y3  1  0.885  0.115  0.750  1.0
  Mg  Mg4  1  0.777  0.223  0.250  1.0
  Mg  Mg5  1  0.223  0.777  0.750  1.0
[/CIF]
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The structure described by MgY2 crystallizes in the orthorhombic Cmcm space group. Mg(1) is bonded in a 10-coordinate geometry to four equivalent Mg(1), two equivalent Y(2), and four equivalent Y(1) atoms. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to four equivalent Mg(1), two equivalent Y(1), and six equivalent Y(2) atoms to form distorted YY8Mg4 cuboctahedra that share corners with six equivalent Y(2)Y10Mg2 cuboctahedra, corners with six equivalent Y(1)Y8Mg4 cuboctahedra, edges with seven equivalent Y(2)Y10Mg2 cuboctahedra, edges with eight equivalent Y(1)Y8Mg4 cuboctahedra, faces with six equivalent Y(2)Y10Mg2 cuboctahedra, and faces with six equivalent Y(1)Y8Mg4 cuboctahedra. In the second Y site, Y(2) is bonded to two equivalent Mg(1), four equivalent Y(2), and six equivalent Y(1) atoms to form distorted YY10Mg2 cuboctahedra that share corners with six equivalent Y(2)Y10Mg2 cuboctahedra, corners with six equivalent Y(1)Y8Mg4 cuboctahedra, edges with seven equivalent Y(1)Y8Mg4 cuboctahedra, faces with six equivalent Y(1)Y8Mg4 cuboctahedra, and faces with ten equivalent Y(2)Y10Mg2 cuboctahedra. is represented by the CIF card [CIF]
data_Y2Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.911
_cell_length_b   8.911
_cell_length_c   5.575
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   155.925
_symmetry_Int_Tables_number   1
_cell_volume   180.599
_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  0.115  0.885  0.250  1.0
  Y  Y1  1  0.440  0.560  0.250  1.0
  Y  Y2  1  0.560  0.440  0.750  1.0
  Y  Y3  1  0.885  0.115  0.750  1.0
  Mg  Mg4  1  0.777  0.223  0.250  1.0
  Mg  Mg5  1  0.223  0.777  0.750  1.0
[/CIF]
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