The structure described by SrMg6Sb crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded to two equivalent Mg(2), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Sb(1) atoms to form SrMg10Sb2 cuboctahedra that share corners with four equivalent Mg(2)Sr2Mg10 cuboctahedra, corners with six equivalent Sr(1)Mg10Sb2 cuboctahedra, edges with two equivalent Mg(2)Sr2Mg10 cuboctahedra, faces with two equivalent Sr(1)Mg10Sb2 cuboctahedra, and faces with two equivalent Mg(2)Sr2Mg10 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Mg(2), two equivalent Mg(4), and two equivalent Sb(1) atoms. In the second Mg site, Mg(2) is bonded to two equivalent Sr(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(3) atoms to form distorted MgSr2Mg10 cuboctahedra that share corners with four equivalent Sr(1)Mg10Sb2 cuboctahedra, corners with six equivalent Mg(2)Sr2Mg10 cuboctahedra, edges with two equivalent Sr(1)Mg10Sb2 cuboctahedra, faces with two equivalent Sr(1)Mg10Sb2 cuboctahedra, and faces with two equivalent Mg(2)Sr2Mg10 cuboctahedra. In the third Mg site, Mg(3) is bonded in a 1-coordinate geometry to two equivalent Sr(1), two equivalent Mg(2), two equivalent Mg(4), and one Sb(1) atom. In the fourth Mg site, Mg(4) is bonded in a 12-coordinate geometry to two equivalent Mg(2), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Sb(1) atoms. Sb(1) is bonded in a 10-coordinate geometry to two equivalent Sr(1), two equivalent Mg(3), two equivalent Mg(4), and four equivalent Mg(1) atoms. is represented by the CIF file [CIF]
data_SrMg6Sb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.190
_cell_length_b   6.787
_cell_length_c   6.787
_cell_angle_alpha   118.362
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   210.396
_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
  Mg  Mg0  1  1.000  0.675  0.832  1.0
  Mg  Mg1  1  0.000  0.168  0.325  1.0
  Mg  Mg2  1  0.000  0.661  0.339  1.0
  Mg  Mg3  1  0.500  0.798  0.649  1.0
  Mg  Mg4  1  0.500  0.351  0.202  1.0
  Mg  Mg5  1  0.500  0.832  0.168  1.0
  Sb  Sb6  1  0.500  0.344  0.656  1.0
  Sr  Sr7  1  0.000  0.172  0.828  1.0
[/CIF]
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The structure described by SrMg6Sb crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded to two equivalent Mg(2), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Sb(1) atoms to form SrMg10Sb2 cuboctahedra that share corners with four equivalent Mg(2)Sr2Mg10 cuboctahedra, corners with six equivalent Sr(1)Mg10Sb2 cuboctahedra, edges with two equivalent Mg(2)Sr2Mg10 cuboctahedra, faces with two equivalent Sr(1)Mg10Sb2 cuboctahedra, and faces with two equivalent Mg(2)Sr2Mg10 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Mg(2), two equivalent Mg(4), and two equivalent Sb(1) atoms. In the second Mg site, Mg(2) is bonded to two equivalent Sr(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(3) atoms to form distorted MgSr2Mg10 cuboctahedra that share corners with four equivalent Sr(1)Mg10Sb2 cuboctahedra, corners with six equivalent Mg(2)Sr2Mg10 cuboctahedra, edges with two equivalent Sr(1)Mg10Sb2 cuboctahedra, faces with two equivalent Sr(1)Mg10Sb2 cuboctahedra, and faces with two equivalent Mg(2)Sr2Mg10 cuboctahedra. In the third Mg site, Mg(3) is bonded in a 1-coordinate geometry to two equivalent Sr(1), two equivalent Mg(2), two equivalent Mg(4), and one Sb(1) atom. In the fourth Mg site, Mg(4) is bonded in a 12-coordinate geometry to two equivalent Mg(2), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Sb(1) atoms. Sb(1) is bonded in a 10-coordinate geometry to two equivalent Sr(1), two equivalent Mg(3), two equivalent Mg(4), and four equivalent Mg(1) atoms. is represented by the CIF file [CIF]
data_SrMg6Sb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.190
_cell_length_b   6.787
_cell_length_c   6.787
_cell_angle_alpha   118.362
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   210.396
_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
  Mg  Mg0  1  1.000  0.675  0.832  1.0
  Mg  Mg1  1  0.000  0.168  0.325  1.0
  Mg  Mg2  1  0.000  0.661  0.339  1.0
  Mg  Mg3  1  0.500  0.798  0.649  1.0
  Mg  Mg4  1  0.500  0.351  0.202  1.0
  Mg  Mg5  1  0.500  0.832  0.168  1.0
  Sb  Sb6  1  0.500  0.344  0.656  1.0
  Sr  Sr7  1  0.000  0.172  0.828  1.0
[/CIF]
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