data_Sr5Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.28
_cell_length_b   4.28
_cell_length_c   15.94
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Sr5Mg
_chemical_formula_sum   'Sr5 Mg1'
_cell_volume   292.46
_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  Sr1  1  0.14  0.14  0.94  1.0
  Sr  Sr2  1  0.14  0.14  0.0  1.0
  Sr  Sr3  1  0.0  0.0  0.95  1.0
  Sr  Sr4  1  0.0  0.0  0.99  1.0
  Sr  Sr5  1  0.14  0.14  0.97  1.0
  Mg  Mg0  1  0.0  0.0  0.0  1.0

data_Sr5Mg
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.06
_cell_length_b   6.06
_cell_length_c   15.94
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Sr5Mg
_chemical_formula_sum   'Sr10 Mg2'
_cell_volume   584.92
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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  2  0.0  0.0  0.95  1.0
  Sr  Sr1  2  0.0  0.0  0.99  1.0
  Sr  Sr2  2  0.14  0.0  0.0  1.0
  Sr  Sr3  2  0.14  0.0  0.94  1.0
  Sr  Sr4  2  0.14  0.0  0.97  1.0
  Mg  Mg5  2  0.0  0.0  0.0  1.0

Sr Sr Sr Sr Sr Mg
(Sr)3Sr2Mg1 crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two Sr clusters and two Sr2Mg1 clusters. In each Sr cluster, there are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a single-bond geometry to one Sr(5) atom. The Sr(1)-Sr(5) bond length is 0.54 Å. In the second Sr site, Sr(2) is bonded in a single-bond geometry to one Sr(5) atom. The Sr(2)-Sr(5) bond length is 0.54 Å. In the third Sr site, Sr(5) is bonded in a distorted linear geometry to one Sr(1) and one Sr(2) atom. In each Sr2Mg1 cluster, there are two inequivalent Sr sites. In the first Sr site, Sr(3) is bonded in a 1-coordinate geometry to one Sr(4) atom. The Sr(3)-Sr(4) bond length is 0.77 Å. In the second Sr site, Sr(4) is bonded in a single-bond geometry to one Sr(3) and one Mg(1) atom. The Sr(4)-Mg(1) bond length is 0.10 Å. Mg(1) is bonded in a single-bond geometry to one Sr(4) atom.