The structure described by SrMg6Y crystallizes in the tetragonal P4/mmm space group. Sr(1) is bonded to four equivalent Mg(1) and eight equivalent Mg(2) atoms to form SrMg12 cuboctahedra that share corners with four equivalent Sr(1)Mg12 cuboctahedra, corners with eight equivalent Y(1)Mg12 cuboctahedra, edges with eight equivalent Mg(1)Sr2Y2Mg8 cuboctahedra, faces with two equivalent Sr(1)Mg12 cuboctahedra, faces with four equivalent Mg(1)Sr2Y2Mg8 cuboctahedra, and faces with four equivalent Y(1)Mg12 cuboctahedra. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Sr(1), eight equivalent Mg(2), and two equivalent Y(1) atoms to form distorted MgSr2Y2Mg8 cuboctahedra that share corners with twelve equivalent Mg(1)Sr2Y2Mg8 cuboctahedra, edges with four equivalent Sr(1)Mg12 cuboctahedra, edges with four equivalent Y(1)Mg12 cuboctahedra, faces with two equivalent Sr(1)Mg12 cuboctahedra, faces with two equivalent Y(1)Mg12 cuboctahedra, and faces with six equivalent Mg(1)Sr2Y2Mg8 cuboctahedra. In the second Mg site, Mg(2) is bonded in a 12-coordinate geometry to two equivalent Sr(1), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Y(1) atoms. Y(1) is bonded to four equivalent Mg(1) and eight equivalent Mg(2) atoms to form YMg12 cuboctahedra that share corners with four equivalent Y(1)Mg12 cuboctahedra, corners with eight equivalent Sr(1)Mg12 cuboctahedra, edges with eight equivalent Mg(1)Sr2Y2Mg8 cuboctahedra, faces with two equivalent Y(1)Mg12 cuboctahedra, faces with four equivalent Sr(1)Mg12 cuboctahedra, and faces with four equivalent Mg(1)Sr2Y2Mg8 cuboctahedra. is represented by the CIF card [CIF]
data_SrYMg6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.753
_cell_length_b   6.753
_cell_length_c   4.848
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   221.059
_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
  Sr  Sr0  1  0.500  0.500  0.500  1.0
  Y  Y1  1  0.000  0.000  0.500  1.0
  Mg  Mg2  1  0.000  0.500  0.500  1.0
  Mg  Mg3  1  0.500  0.000  0.500  1.0
  Mg  Mg4  1  0.763  0.237  0.000  1.0
  Mg  Mg5  1  0.237  0.763  0.000  1.0
  Mg  Mg6  1  0.763  0.763  0.000  1.0
  Mg  Mg7  1  0.237  0.237  0.000  1.0
[/CIF]
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The structure described by SrMg6Y crystallizes in the tetragonal P4/mmm space group. Sr(1) is bonded to four equivalent Mg(1) and eight equivalent Mg(2) atoms to form SrMg12 cuboctahedra that share corners with four equivalent Sr(1)Mg12 cuboctahedra, corners with eight equivalent Y(1)Mg12 cuboctahedra, edges with eight equivalent Mg(1)Sr2Y2Mg8 cuboctahedra, faces with two equivalent Sr(1)Mg12 cuboctahedra, faces with four equivalent Mg(1)Sr2Y2Mg8 cuboctahedra, and faces with four equivalent Y(1)Mg12 cuboctahedra. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Sr(1), eight equivalent Mg(2), and two equivalent Y(1) atoms to form distorted MgSr2Y2Mg8 cuboctahedra that share corners with twelve equivalent Mg(1)Sr2Y2Mg8 cuboctahedra, edges with four equivalent Sr(1)Mg12 cuboctahedra, edges with four equivalent Y(1)Mg12 cuboctahedra, faces with two equivalent Sr(1)Mg12 cuboctahedra, faces with two equivalent Y(1)Mg12 cuboctahedra, and faces with six equivalent Mg(1)Sr2Y2Mg8 cuboctahedra. In the second Mg site, Mg(2) is bonded in a 12-coordinate geometry to two equivalent Sr(1), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Y(1) atoms. Y(1) is bonded to four equivalent Mg(1) and eight equivalent Mg(2) atoms to form YMg12 cuboctahedra that share corners with four equivalent Y(1)Mg12 cuboctahedra, corners with eight equivalent Sr(1)Mg12 cuboctahedra, edges with eight equivalent Mg(1)Sr2Y2Mg8 cuboctahedra, faces with two equivalent Y(1)Mg12 cuboctahedra, faces with four equivalent Sr(1)Mg12 cuboctahedra, and faces with four equivalent Mg(1)Sr2Y2Mg8 cuboctahedra. is represented by the CIF card [CIF]
data_SrYMg6
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.753
_cell_length_b   6.753
_cell_length_c   4.848
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   221.059
_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
  Sr  Sr0  1  0.500  0.500  0.500  1.0
  Y  Y1  1  0.000  0.000  0.500  1.0
  Mg  Mg2  1  0.000  0.500  0.500  1.0
  Mg  Mg3  1  0.500  0.000  0.500  1.0
  Mg  Mg4  1  0.763  0.237  0.000  1.0
  Mg  Mg5  1  0.237  0.763  0.000  1.0
  Mg  Mg6  1  0.763  0.763  0.000  1.0
  Mg  Mg7  1  0.237  0.237  0.000  1.0
[/CIF]
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