The compound described by Mg2Sr is Tungsten Carbide-like structured and crystallizes in the hexagonal P-6m2 space group. Sr(1) is bonded in a 6-coordinate geometry to three equivalent Mg(2) and three equivalent Mg(3) atoms. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to six equivalent Mg(2) atoms to form distorted edge-sharing MgMg6 pentagonal pyramids. In the second Mg site, Mg(2) is bonded to three equivalent Sr(1) and three equivalent Mg(1) atoms to form a mixture of distorted edge, face, and corner-sharing MgSr3Mg3 pentagonal pyramids. In the third Mg site, Mg(3) is bonded in a 6-coordinate geometry to six equivalent Sr(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_SrMg2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.052
_cell_length_b   4.052
_cell_length_c   14.958
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   212.695
_cell_formula_units_Z   2
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  0.667  0.333  0.182  1.0
  Sr  Sr1  1  0.667  0.333  0.818  1.0
  Mg  Mg2  1  0.667  0.333  0.500  1.0
  Mg  Mg3  1  0.000  0.000  0.367  1.0
  Mg  Mg4  1  0.000  0.000  0.000  1.0
  Mg  Mg5  1  0.000  0.000  0.633  1.0
[/CIF]
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The compound described by Mg2Sr is Tungsten Carbide-like structured and crystallizes in the hexagonal P-6m2 space group. Sr(1) is bonded in a 6-coordinate geometry to three equivalent Mg(2) and three equivalent Mg(3) atoms. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to six equivalent Mg(2) atoms to form distorted edge-sharing MgMg6 pentagonal pyramids. In the second Mg site, Mg(2) is bonded to three equivalent Sr(1) and three equivalent Mg(1) atoms to form a mixture of distorted edge, face, and corner-sharing MgSr3Mg3 pentagonal pyramids. In the third Mg site, Mg(3) is bonded in a 6-coordinate geometry to six equivalent Sr(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_SrMg2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.052
_cell_length_b   4.052
_cell_length_c   14.958
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   212.695
_cell_formula_units_Z   2
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  0.667  0.333  0.182  1.0
  Sr  Sr1  1  0.667  0.333  0.818  1.0
  Mg  Mg2  1  0.667  0.333  0.500  1.0
  Mg  Mg3  1  0.000  0.000  0.367  1.0
  Mg  Mg4  1  0.000  0.000  0.000  1.0
  Mg  Mg5  1  0.000  0.000  0.633  1.0
[/CIF]
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