The compound described by Mg2Y is beta-derived structured and crystallizes in the monoclinic C2/c space group. Mg(1) is bonded to seven equivalent Mg(1) and five equivalent Y(1) atoms to form MgY5Mg7 cuboctahedra that share corners with six equivalent Y(1)Y2Mg10 cuboctahedra, corners with twelve equivalent Mg(1)Y5Mg7 cuboctahedra, edges with four equivalent Y(1)Y2Mg10 cuboctahedra, edges with fourteen equivalent Mg(1)Y5Mg7 cuboctahedra, faces with eight equivalent Y(1)Y2Mg10 cuboctahedra, and faces with twelve equivalent Mg(1)Y5Mg7 cuboctahedra. Y(1) is bonded to ten equivalent Mg(1) and two equivalent Y(1) atoms to form YY2Mg10 cuboctahedra that share corners with six equivalent Y(1)Y2Mg10 cuboctahedra, corners with twelve equivalent Mg(1)Y5Mg7 cuboctahedra, edges with eight equivalent Mg(1)Y5Mg7 cuboctahedra, edges with ten equivalent Y(1)Y2Mg10 cuboctahedra, faces with four equivalent Y(1)Y2Mg10 cuboctahedra, and faces with sixteen equivalent Mg(1)Y5Mg7 cuboctahedra. is represented by the CIF card [CIF]
data_YMg2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.736
_cell_length_b   5.736
_cell_length_c   6.530
_cell_angle_alpha   63.947
_cell_angle_beta   63.947
_cell_angle_gamma   59.017
_symmetry_Int_Tables_number   1
_cell_volume   158.994
_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  0.087  0.913  0.250  1.0
  Y  Y1  1  0.913  0.087  0.750  1.0
  Mg  Mg2  1  0.250  0.417  0.748  1.0
  Mg  Mg3  1  0.583  0.750  0.752  1.0
  Mg  Mg4  1  0.417  0.250  0.248  1.0
  Mg  Mg5  1  0.750  0.583  0.252  1.0
[/CIF]
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The compound described by Mg2Y is beta-derived structured and crystallizes in the monoclinic C2/c space group. Mg(1) is bonded to seven equivalent Mg(1) and five equivalent Y(1) atoms to form MgY5Mg7 cuboctahedra that share corners with six equivalent Y(1)Y2Mg10 cuboctahedra, corners with twelve equivalent Mg(1)Y5Mg7 cuboctahedra, edges with four equivalent Y(1)Y2Mg10 cuboctahedra, edges with fourteen equivalent Mg(1)Y5Mg7 cuboctahedra, faces with eight equivalent Y(1)Y2Mg10 cuboctahedra, and faces with twelve equivalent Mg(1)Y5Mg7 cuboctahedra. Y(1) is bonded to ten equivalent Mg(1) and two equivalent Y(1) atoms to form YY2Mg10 cuboctahedra that share corners with six equivalent Y(1)Y2Mg10 cuboctahedra, corners with twelve equivalent Mg(1)Y5Mg7 cuboctahedra, edges with eight equivalent Mg(1)Y5Mg7 cuboctahedra, edges with ten equivalent Y(1)Y2Mg10 cuboctahedra, faces with four equivalent Y(1)Y2Mg10 cuboctahedra, and faces with sixteen equivalent Mg(1)Y5Mg7 cuboctahedra. is represented by the CIF card [CIF]
data_YMg2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.736
_cell_length_b   5.736
_cell_length_c   6.530
_cell_angle_alpha   63.947
_cell_angle_beta   63.947
_cell_angle_gamma   59.017
_symmetry_Int_Tables_number   1
_cell_volume   158.994
_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  0.087  0.913  0.250  1.0
  Y  Y1  1  0.913  0.087  0.750  1.0
  Mg  Mg2  1  0.250  0.417  0.748  1.0
  Mg  Mg3  1  0.583  0.750  0.752  1.0
  Mg  Mg4  1  0.417  0.250  0.248  1.0
  Mg  Mg5  1  0.750  0.583  0.252  1.0
[/CIF]
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