The material described by SrMg14C crystallizes in the hexagonal P-6m2 space group. Sr(1) is bonded to six equivalent Mg(1) and six equivalent Mg(3) atoms to form SrMg12 cuboctahedra that share corners with six equivalent Sr(1)Mg12 cuboctahedra, edges with six equivalent Mg(1)Sr2Mg10 cuboctahedra, faces with six equivalent Mg(4)Mg12 cuboctahedra, and faces with six equivalent Mg(1)Sr2Mg10 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) 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 six equivalent Mg(1)Sr2Mg10 cuboctahedra, edges with two equivalent Sr(1)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with four equivalent Mg(1)Sr2Mg10 cuboctahedra, faces with two equivalent Sr(1)Mg12 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, and faces with four equivalent Mg(1)Sr2Mg10 cuboctahedra. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Mg(4), four equivalent Mg(2), and four equivalent Mg(3) atoms. In the third Mg site, Mg(3) is bonded in a 1-coordinate geometry to one Sr(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), and one C(1) atom. In the fourth Mg site, Mg(4) is bonded to three equivalent Mg(1), three equivalent Mg(2), and six equivalent Mg(3) atoms to form distorted MgMg12 cuboctahedra that share corners with six equivalent Mg(4)Mg12 cuboctahedra, edges with six equivalent Mg(1)Sr2Mg10 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with three equivalent Sr(1)Mg12 cuboctahedra, and faces with three equivalent Mg(1)Sr2Mg10 cuboctahedra. C(1) is bonded in a 6-coordinate geometry to six equivalent Mg(3) atoms. is represented by the CIF card [CIF]
data_SrMg14C
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.489
_cell_length_b   6.489
_cell_length_c   10.157
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   370.380
_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  0.167  0.333  0.125  1.0
  Mg  Mg1  1  0.183  0.841  0.125  1.0
  Mg  Mg2  1  0.149  0.825  0.625  1.0
  Mg  Mg3  1  0.659  0.317  0.125  1.0
  Mg  Mg4  1  0.675  0.351  0.625  1.0
  Mg  Mg5  1  0.659  0.841  0.125  1.0
  Mg  Mg6  1  0.675  0.825  0.625  1.0
  Mg  Mg7  1  0.326  0.174  0.407  1.0
  Mg  Mg8  1  0.326  0.174  0.843  1.0
  Mg  Mg9  1  0.326  0.652  0.407  1.0
  Mg  Mg10  1  0.326  0.652  0.843  1.0
  Mg  Mg11  1  0.848  0.174  0.407  1.0
  Mg  Mg12  1  0.848  0.174  0.843  1.0
  Mg  Mg13  1  0.833  0.667  0.364  1.0
  Mg  Mg14  1  0.833  0.667  0.886  1.0
  C  C15  1  0.167  0.333  0.625  1.0
[/CIF]
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The material described by SrMg14C crystallizes in the hexagonal P-6m2 space group. Sr(1) is bonded to six equivalent Mg(1) and six equivalent Mg(3) atoms to form SrMg12 cuboctahedra that share corners with six equivalent Sr(1)Mg12 cuboctahedra, edges with six equivalent Mg(1)Sr2Mg10 cuboctahedra, faces with six equivalent Mg(4)Mg12 cuboctahedra, and faces with six equivalent Mg(1)Sr2Mg10 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) 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 six equivalent Mg(1)Sr2Mg10 cuboctahedra, edges with two equivalent Sr(1)Mg12 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, edges with four equivalent Mg(1)Sr2Mg10 cuboctahedra, faces with two equivalent Sr(1)Mg12 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, and faces with four equivalent Mg(1)Sr2Mg10 cuboctahedra. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Mg(4), four equivalent Mg(2), and four equivalent Mg(3) atoms. In the third Mg site, Mg(3) is bonded in a 1-coordinate geometry to one Sr(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), and one C(1) atom. In the fourth Mg site, Mg(4) is bonded to three equivalent Mg(1), three equivalent Mg(2), and six equivalent Mg(3) atoms to form distorted MgMg12 cuboctahedra that share corners with six equivalent Mg(4)Mg12 cuboctahedra, edges with six equivalent Mg(1)Sr2Mg10 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with three equivalent Sr(1)Mg12 cuboctahedra, and faces with three equivalent Mg(1)Sr2Mg10 cuboctahedra. C(1) is bonded in a 6-coordinate geometry to six equivalent Mg(3) atoms. is represented by the CIF card [CIF]
data_SrMg14C
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.489
_cell_length_b   6.489
_cell_length_c   10.157
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   370.380
_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  0.167  0.333  0.125  1.0
  Mg  Mg1  1  0.183  0.841  0.125  1.0
  Mg  Mg2  1  0.149  0.825  0.625  1.0
  Mg  Mg3  1  0.659  0.317  0.125  1.0
  Mg  Mg4  1  0.675  0.351  0.625  1.0
  Mg  Mg5  1  0.659  0.841  0.125  1.0
  Mg  Mg6  1  0.675  0.825  0.625  1.0
  Mg  Mg7  1  0.326  0.174  0.407  1.0
  Mg  Mg8  1  0.326  0.174  0.843  1.0
  Mg  Mg9  1  0.326  0.652  0.407  1.0
  Mg  Mg10  1  0.326  0.652  0.843  1.0
  Mg  Mg11  1  0.848  0.174  0.407  1.0
  Mg  Mg12  1  0.848  0.174  0.843  1.0
  Mg  Mg13  1  0.833  0.667  0.364  1.0
  Mg  Mg14  1  0.833  0.667  0.886  1.0
  C  C15  1  0.167  0.333  0.625  1.0
[/CIF]
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