The structure described by SrMg6Al crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Al(1) atoms to form SrMg10Al2 cuboctahedra that share corners with four equivalent Mg(4)Sr2Mg10 cuboctahedra, corners with six equivalent Sr(1)Mg10Al2 cuboctahedra, edges with two equivalent Mg(4)Sr2Mg10 cuboctahedra, faces with two equivalent Sr(1)Mg10Al2 cuboctahedra, and faces with two equivalent Mg(4)Sr2Mg10 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to two equivalent Sr(1), one Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and one Al(1) atom. In the second Mg site, Mg(2) is bonded in a 12-coordinate geometry to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Al(1) atoms. In the third Mg site, Mg(3) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), and two equivalent Al(1) atoms. In the fourth Mg site, Mg(4) is bonded to two equivalent Sr(1), two equivalent Mg(2), four equivalent Mg(1), and four equivalent Mg(3) atoms to form distorted MgSr2Mg10 cuboctahedra that share corners with four equivalent Sr(1)Mg10Al2 cuboctahedra, corners with six equivalent Mg(4)Sr2Mg10 cuboctahedra, edges with two equivalent Sr(1)Mg10Al2 cuboctahedra, faces with two equivalent Sr(1)Mg10Al2 cuboctahedra, and faces with two equivalent Mg(4)Sr2Mg10 cuboctahedra. Al(1) is bonded in a 8-coordinate geometry to two equivalent Sr(1), two equivalent Mg(1), two equivalent Mg(2), and four equivalent Mg(3) atoms. is represented by the CIF card [CIF]
data_SrMg6Al
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.144
_cell_length_b   6.727
_cell_length_c   6.727
_cell_angle_alpha   119.263
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   203.068
_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
  Al  Al0  1  0.000  0.156  0.844  1.0
  Mg  Mg1  1  0.000  0.693  0.845  1.0
  Mg  Mg2  1  0.000  0.155  0.307  1.0
  Mg  Mg3  1  0.000  0.667  0.333  1.0
  Mg  Mg4  1  0.500  0.843  0.680  1.0
  Mg  Mg5  1  0.500  0.320  0.157  1.0
  Mg  Mg6  1  0.500  0.836  0.164  1.0
  Sr  Sr7  1  0.500  0.330  0.670  1.0
[/CIF]
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The structure described by SrMg6Al crystallizes in the orthorhombic Amm2 space group. Sr(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Al(1) atoms to form SrMg10Al2 cuboctahedra that share corners with four equivalent Mg(4)Sr2Mg10 cuboctahedra, corners with six equivalent Sr(1)Mg10Al2 cuboctahedra, edges with two equivalent Mg(4)Sr2Mg10 cuboctahedra, faces with two equivalent Sr(1)Mg10Al2 cuboctahedra, and faces with two equivalent Mg(4)Sr2Mg10 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to two equivalent Sr(1), one Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and one Al(1) atom. In the second Mg site, Mg(2) is bonded in a 12-coordinate geometry to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Al(1) atoms. In the third Mg site, Mg(3) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), and two equivalent Al(1) atoms. In the fourth Mg site, Mg(4) is bonded to two equivalent Sr(1), two equivalent Mg(2), four equivalent Mg(1), and four equivalent Mg(3) atoms to form distorted MgSr2Mg10 cuboctahedra that share corners with four equivalent Sr(1)Mg10Al2 cuboctahedra, corners with six equivalent Mg(4)Sr2Mg10 cuboctahedra, edges with two equivalent Sr(1)Mg10Al2 cuboctahedra, faces with two equivalent Sr(1)Mg10Al2 cuboctahedra, and faces with two equivalent Mg(4)Sr2Mg10 cuboctahedra. Al(1) is bonded in a 8-coordinate geometry to two equivalent Sr(1), two equivalent Mg(1), two equivalent Mg(2), and four equivalent Mg(3) atoms. is represented by the CIF card [CIF]
data_SrMg6Al
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.144
_cell_length_b   6.727
_cell_length_c   6.727
_cell_angle_alpha   119.263
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   203.068
_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
  Al  Al0  1  0.000  0.156  0.844  1.0
  Mg  Mg1  1  0.000  0.693  0.845  1.0
  Mg  Mg2  1  0.000  0.155  0.307  1.0
  Mg  Mg3  1  0.000  0.667  0.333  1.0
  Mg  Mg4  1  0.500  0.843  0.680  1.0
  Mg  Mg5  1  0.500  0.320  0.157  1.0
  Mg  Mg6  1  0.500  0.836  0.164  1.0
  Sr  Sr7  1  0.500  0.330  0.670  1.0
[/CIF]
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