The structure described by Mg6NbC crystallizes in the orthorhombic Amm2 space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a single-bond geometry to two equivalent Mg(4), two equivalent Nb(1), and one C(1) atom. In the second Mg site, Mg(2) is bonded in a 2-coordinate geometry to one Mg(4), two equivalent Nb(1), and two equivalent C(1) atoms. In the third Mg site, Mg(3) is bonded in a 2-coordinate geometry to two equivalent Mg(4) and two equivalent Nb(1) atoms. In the fourth Mg site, Mg(4) is bonded in a 8-coordinate geometry to two equivalent Mg(2), two equivalent Mg(3), and four equivalent Mg(1) atoms. Nb(1) is bonded to two equivalent Mg(3), four equivalent Mg(1), four equivalent Mg(2), and two equivalent C(1) atoms to form a mixture of distorted corner and face-sharing NbMg10C2 cuboctahedra. C(1) is bonded in a 8-coordinate geometry to two equivalent Mg(1), four equivalent Mg(2), and two equivalent Nb(1) atoms. is represented by the CIF file [CIF]
data_Mg6NbC
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.571
_cell_length_b   6.571
_cell_length_c   4.560
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   130.065
_symmetry_Int_Tables_number   1
_cell_volume   150.653
_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
  Mg  Mg0  1  0.308  0.201  0.500  1.0
  Mg  Mg1  1  0.799  0.692  0.500  1.0
  Mg  Mg2  1  0.166  0.339  0.000  1.0
  Mg  Mg3  1  0.661  0.834  0.000  1.0
  Mg  Mg4  1  0.663  0.337  0.000  1.0
  Mg  Mg5  1  0.198  0.802  0.000  1.0
  Nb  Nb6  1  0.811  0.189  0.500  1.0
  C  C7  1  0.393  0.607  0.500  1.0
[/CIF]
.
The structure described by Mg6NbC crystallizes in the orthorhombic Amm2 space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a single-bond geometry to two equivalent Mg(4), two equivalent Nb(1), and one C(1) atom. In the second Mg site, Mg(2) is bonded in a 2-coordinate geometry to one Mg(4), two equivalent Nb(1), and two equivalent C(1) atoms. In the third Mg site, Mg(3) is bonded in a 2-coordinate geometry to two equivalent Mg(4) and two equivalent Nb(1) atoms. In the fourth Mg site, Mg(4) is bonded in a 8-coordinate geometry to two equivalent Mg(2), two equivalent Mg(3), and four equivalent Mg(1) atoms. Nb(1) is bonded to two equivalent Mg(3), four equivalent Mg(1), four equivalent Mg(2), and two equivalent C(1) atoms to form a mixture of distorted corner and face-sharing NbMg10C2 cuboctahedra. C(1) is bonded in a 8-coordinate geometry to two equivalent Mg(1), four equivalent Mg(2), and two equivalent Nb(1) atoms. is represented by the CIF file [CIF]
data_Mg6NbC
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.571
_cell_length_b   6.571
_cell_length_c   4.560
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   130.065
_symmetry_Int_Tables_number   1
_cell_volume   150.653
_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
  Mg  Mg0  1  0.308  0.201  0.500  1.0
  Mg  Mg1  1  0.799  0.692  0.500  1.0
  Mg  Mg2  1  0.166  0.339  0.000  1.0
  Mg  Mg3  1  0.661  0.834  0.000  1.0
  Mg  Mg4  1  0.663  0.337  0.000  1.0
  Mg  Mg5  1  0.198  0.802  0.000  1.0
  Nb  Nb6  1  0.811  0.189  0.500  1.0
  C  C7  1  0.393  0.607  0.500  1.0
[/CIF]
.