The structure described by Sr5Mg crystallizes in the orthorhombic Amm2 space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to two equivalent Sr(1), two equivalent Sr(2), two equivalent Sr(3), two equivalent Sr(5), and four equivalent Sr(4) atoms to form SrSr12 cuboctahedra that share corners with six equivalent Sr(3)Sr10Mg2 cuboctahedra, corners with six equivalent Sr(1)Sr12 cuboctahedra, corners with six equivalent Sr(2)Sr8Mg4 cuboctahedra, edges with three equivalent Sr(3)Sr10Mg2 cuboctahedra, edges with three equivalent Sr(2)Sr8Mg4 cuboctahedra, faces with two equivalent Sr(3)Sr10Mg2 cuboctahedra, faces with two equivalent Sr(2)Sr8Mg4 cuboctahedra, and faces with four equivalent Sr(1)Sr12 cuboctahedra. In the second Sr site, Sr(2) is bonded to two equivalent Sr(1), two equivalent Sr(2), two equivalent Sr(3), two equivalent Sr(4), and four equivalent Mg(1) atoms to form distorted SrSr8Mg4 cuboctahedra that share corners with six equivalent Sr(3)Sr10Mg2 cuboctahedra, corners with six equivalent Sr(1)Sr12 cuboctahedra, corners with six equivalent Sr(2)Sr8Mg4 cuboctahedra, edges with three equivalent Sr(3)Sr10Mg2 cuboctahedra, edges with three equivalent Sr(1)Sr12 cuboctahedra, faces with two equivalent Sr(3)Sr10Mg2 cuboctahedra, faces with two equivalent Sr(1)Sr12 cuboctahedra, and faces with four equivalent Sr(2)Sr8Mg4 cuboctahedra. In the third Sr site, Sr(3) is bonded to two equivalent Sr(1), two equivalent Sr(2), two equivalent Sr(3), four equivalent Sr(5), and two equivalent Mg(1) atoms to form distorted SrSr10Mg2 cuboctahedra that share corners with six equivalent Sr(3)Sr10Mg2 cuboctahedra, corners with six equivalent Sr(1)Sr12 cuboctahedra, corners with six equivalent Sr(2)Sr8Mg4 cuboctahedra, edges with three equivalent Sr(1)Sr12 cuboctahedra, edges with three equivalent Sr(2)Sr8Mg4 cuboctahedra, faces with two equivalent Sr(1)Sr12 cuboctahedra, faces with two equivalent Sr(2)Sr8Mg4 cuboctahedra, and faces with four equivalent Sr(3)Sr10Mg2 cuboctahedra. In the fourth Sr site, Sr(4) is bonded in a 2-coordinate geometry to two equivalent Sr(2), four equivalent Sr(1), and two equivalent Mg(1) atoms. In the fifth Sr site, Sr(5) is bonded in a 2-coordinate geometry to two equivalent Sr(1), four equivalent Sr(3), and two equivalent Mg(1) atoms. Mg(1) is bonded in a 10-coordinate geometry to two equivalent Sr(3), two equivalent Sr(4), two equivalent Sr(5), and four equivalent Sr(2) atoms. is represented by the CIF card [CIF]
data_Sr5Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.618
_cell_length_b   10.618
_cell_length_c   6.648
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   156.982
_symmetry_Int_Tables_number   1
_cell_volume   293.087
_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  0.999  0.001  0.000  1.0
  Sr  Sr1  1  0.326  0.674  0.000  1.0
  Sr  Sr2  1  0.670  0.330  0.000  1.0
  Sr  Sr3  1  0.432  0.568  0.500  1.0
  Sr  Sr4  1  0.127  0.873  0.500  1.0
  Mg  Mg5  1  0.780  0.220  0.500  1.0
[/CIF]
.
The structure described by Sr5Mg crystallizes in the orthorhombic Amm2 space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to two equivalent Sr(1), two equivalent Sr(2), two equivalent Sr(3), two equivalent Sr(5), and four equivalent Sr(4) atoms to form SrSr12 cuboctahedra that share corners with six equivalent Sr(3)Sr10Mg2 cuboctahedra, corners with six equivalent Sr(1)Sr12 cuboctahedra, corners with six equivalent Sr(2)Sr8Mg4 cuboctahedra, edges with three equivalent Sr(3)Sr10Mg2 cuboctahedra, edges with three equivalent Sr(2)Sr8Mg4 cuboctahedra, faces with two equivalent Sr(3)Sr10Mg2 cuboctahedra, faces with two equivalent Sr(2)Sr8Mg4 cuboctahedra, and faces with four equivalent Sr(1)Sr12 cuboctahedra. In the second Sr site, Sr(2) is bonded to two equivalent Sr(1), two equivalent Sr(2), two equivalent Sr(3), two equivalent Sr(4), and four equivalent Mg(1) atoms to form distorted SrSr8Mg4 cuboctahedra that share corners with six equivalent Sr(3)Sr10Mg2 cuboctahedra, corners with six equivalent Sr(1)Sr12 cuboctahedra, corners with six equivalent Sr(2)Sr8Mg4 cuboctahedra, edges with three equivalent Sr(3)Sr10Mg2 cuboctahedra, edges with three equivalent Sr(1)Sr12 cuboctahedra, faces with two equivalent Sr(3)Sr10Mg2 cuboctahedra, faces with two equivalent Sr(1)Sr12 cuboctahedra, and faces with four equivalent Sr(2)Sr8Mg4 cuboctahedra. In the third Sr site, Sr(3) is bonded to two equivalent Sr(1), two equivalent Sr(2), two equivalent Sr(3), four equivalent Sr(5), and two equivalent Mg(1) atoms to form distorted SrSr10Mg2 cuboctahedra that share corners with six equivalent Sr(3)Sr10Mg2 cuboctahedra, corners with six equivalent Sr(1)Sr12 cuboctahedra, corners with six equivalent Sr(2)Sr8Mg4 cuboctahedra, edges with three equivalent Sr(1)Sr12 cuboctahedra, edges with three equivalent Sr(2)Sr8Mg4 cuboctahedra, faces with two equivalent Sr(1)Sr12 cuboctahedra, faces with two equivalent Sr(2)Sr8Mg4 cuboctahedra, and faces with four equivalent Sr(3)Sr10Mg2 cuboctahedra. In the fourth Sr site, Sr(4) is bonded in a 2-coordinate geometry to two equivalent Sr(2), four equivalent Sr(1), and two equivalent Mg(1) atoms. In the fifth Sr site, Sr(5) is bonded in a 2-coordinate geometry to two equivalent Sr(1), four equivalent Sr(3), and two equivalent Mg(1) atoms. Mg(1) is bonded in a 10-coordinate geometry to two equivalent Sr(3), two equivalent Sr(4), two equivalent Sr(5), and four equivalent Sr(2) atoms. is represented by the CIF card [CIF]
data_Sr5Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.618
_cell_length_b   10.618
_cell_length_c   6.648
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   156.982
_symmetry_Int_Tables_number   1
_cell_volume   293.087
_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  0.999  0.001  0.000  1.0
  Sr  Sr1  1  0.326  0.674  0.000  1.0
  Sr  Sr2  1  0.670  0.330  0.000  1.0
  Sr  Sr3  1  0.432  0.568  0.500  1.0
  Sr  Sr4  1  0.127  0.873  0.500  1.0
  Mg  Mg5  1  0.780  0.220  0.500  1.0
[/CIF]
.