The material described by NaMg6Co crystallizes in the orthorhombic Amm2 space group. Na(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Co(1) atoms to form NaMg10Co2 cuboctahedra that share corners with four equivalent Mg(4)Na2Mg10 cuboctahedra, corners with six equivalent Na(1)Mg10Co2 cuboctahedra, edges with two equivalent Mg(4)Na2Mg10 cuboctahedra, faces with two equivalent Na(1)Mg10Co2 cuboctahedra, faces with two equivalent Mg(4)Na2Mg10 cuboctahedra, and faces with six equivalent Mg(2)Mg10Co2 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 3-coordinate geometry to two equivalent Na(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and one Co(1) atom. In the second Mg site, Mg(2) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Co(1) atoms to form distorted MgMg10Co2 cuboctahedra that share corners with six equivalent Mg(2)Mg10Co2 cuboctahedra, edges with four equivalent Mg(4)Na2Mg10 cuboctahedra, faces with two equivalent Mg(2)Mg10Co2 cuboctahedra, faces with two equivalent Mg(4)Na2Mg10 cuboctahedra, and faces with six equivalent Na(1)Mg10Co2 cuboctahedra. In the third Mg site, Mg(3) is bonded in a 12-coordinate geometry to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Co(1) atoms. In the fourth Mg site, Mg(4) is bonded to two equivalent Na(1), two equivalent Mg(2), four equivalent Mg(1), and four equivalent Mg(3) atoms to form distorted MgNa2Mg10 cuboctahedra that share corners with four equivalent Na(1)Mg10Co2 cuboctahedra, corners with six equivalent Mg(4)Na2Mg10 cuboctahedra, edges with two equivalent Na(1)Mg10Co2 cuboctahedra, edges with four equivalent Mg(2)Mg10Co2 cuboctahedra, faces with two equivalent Na(1)Mg10Co2 cuboctahedra, faces with two equivalent Mg(2)Mg10Co2 cuboctahedra, and faces with two equivalent Mg(4)Na2Mg10 cuboctahedra. Co(1) is bonded in a 10-coordinate geometry to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), and four equivalent Mg(3) atoms. is represented by the CIF file [CIF]
data_NaMg6Co
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.957
_cell_length_b   6.250
_cell_length_c   6.250
_cell_angle_alpha   119.481
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   168.582
_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
  Co  Co0  1  0.000  0.130  0.870  1.0
  Mg  Mg1  1  1.000  0.682  0.836  1.0
  Mg  Mg2  1  1.000  0.164  0.318  1.0
  Mg  Mg3  1  0.000  0.665  0.335  1.0
  Mg  Mg4  1  0.500  0.864  0.676  1.0
  Mg  Mg5  1  0.500  0.324  0.136  1.0
  Mg  Mg6  1  0.500  0.836  0.164  1.0
  Na  Na7  1  0.500  0.334  0.666  1.0
[/CIF]
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The material described by NaMg6Co crystallizes in the orthorhombic Amm2 space group. Na(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Co(1) atoms to form NaMg10Co2 cuboctahedra that share corners with four equivalent Mg(4)Na2Mg10 cuboctahedra, corners with six equivalent Na(1)Mg10Co2 cuboctahedra, edges with two equivalent Mg(4)Na2Mg10 cuboctahedra, faces with two equivalent Na(1)Mg10Co2 cuboctahedra, faces with two equivalent Mg(4)Na2Mg10 cuboctahedra, and faces with six equivalent Mg(2)Mg10Co2 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 3-coordinate geometry to two equivalent Na(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and one Co(1) atom. In the second Mg site, Mg(2) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Co(1) atoms to form distorted MgMg10Co2 cuboctahedra that share corners with six equivalent Mg(2)Mg10Co2 cuboctahedra, edges with four equivalent Mg(4)Na2Mg10 cuboctahedra, faces with two equivalent Mg(2)Mg10Co2 cuboctahedra, faces with two equivalent Mg(4)Na2Mg10 cuboctahedra, and faces with six equivalent Na(1)Mg10Co2 cuboctahedra. In the third Mg site, Mg(3) is bonded in a 12-coordinate geometry to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Co(1) atoms. In the fourth Mg site, Mg(4) is bonded to two equivalent Na(1), two equivalent Mg(2), four equivalent Mg(1), and four equivalent Mg(3) atoms to form distorted MgNa2Mg10 cuboctahedra that share corners with four equivalent Na(1)Mg10Co2 cuboctahedra, corners with six equivalent Mg(4)Na2Mg10 cuboctahedra, edges with two equivalent Na(1)Mg10Co2 cuboctahedra, edges with four equivalent Mg(2)Mg10Co2 cuboctahedra, faces with two equivalent Na(1)Mg10Co2 cuboctahedra, faces with two equivalent Mg(2)Mg10Co2 cuboctahedra, and faces with two equivalent Mg(4)Na2Mg10 cuboctahedra. Co(1) is bonded in a 10-coordinate geometry to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), and four equivalent Mg(3) atoms. is represented by the CIF file [CIF]
data_NaMg6Co
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.957
_cell_length_b   6.250
_cell_length_c   6.250
_cell_angle_alpha   119.481
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   168.582
_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
  Co  Co0  1  0.000  0.130  0.870  1.0
  Mg  Mg1  1  1.000  0.682  0.836  1.0
  Mg  Mg2  1  1.000  0.164  0.318  1.0
  Mg  Mg3  1  0.000  0.665  0.335  1.0
  Mg  Mg4  1  0.500  0.864  0.676  1.0
  Mg  Mg5  1  0.500  0.324  0.136  1.0
  Mg  Mg6  1  0.500  0.836  0.164  1.0
  Na  Na7  1  0.500  0.334  0.666  1.0
[/CIF]
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