The crystal structure described by KMg6Sb crystallizes in the orthorhombic Amm2 space group. K(1) is bonded to two equivalent Mg(3), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Sb(1) atoms to form KMg10Sb2 cuboctahedra that share corners with four equivalent Sb(1)K2Mg10 cuboctahedra, corners with six equivalent K(1)Mg10Sb2 cuboctahedra, corners with eight equivalent Mg(1)K2Mg8Sb2 cuboctahedra, edges with two equivalent Sb(1)K2Mg10 cuboctahedra, edges with four equivalent Mg(1)K2Mg8Sb2 cuboctahedra, faces with two equivalent K(1)Mg10Sb2 cuboctahedra, faces with two equivalent Sb(1)K2Mg10 cuboctahedra, and faces with four equivalent Mg(1)K2Mg8Sb2 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent K(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Sb(1) atoms to form distorted MgK2Mg8Sb2 cuboctahedra that share corners with four equivalent K(1)Mg10Sb2 cuboctahedra, corners with four equivalent Sb(1)K2Mg10 cuboctahedra, corners with ten equivalent Mg(1)K2Mg8Sb2 cuboctahedra, edges with two equivalent K(1)Mg10Sb2 cuboctahedra, edges with two equivalent Mg(1)K2Mg8Sb2 cuboctahedra, edges with two equivalent Sb(1)K2Mg10 cuboctahedra, faces with two equivalent K(1)Mg10Sb2 cuboctahedra, faces with two equivalent Sb(1)K2Mg10 cuboctahedra, and faces with four equivalent Mg(1)K2Mg8Sb2 cuboctahedra. In the second Mg site, Mg(2) is bonded in a 4-coordinate geometry to two equivalent K(1), two equivalent Mg(1), and two equivalent Sb(1) atoms. In the third Mg site, Mg(3) is bonded in a 2-coordinate geometry to two equivalent K(1) and four equivalent Mg(1) atoms. In the fourth Mg site, Mg(4) is bonded in a distorted water-like geometry to four equivalent Mg(1) and two equivalent Sb(1) atoms. Sb(1) is bonded to two equivalent K(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(2) atoms to form SbK2Mg10 cuboctahedra that share corners with four equivalent K(1)Mg10Sb2 cuboctahedra, corners with six equivalent Sb(1)K2Mg10 cuboctahedra, corners with eight equivalent Mg(1)K2Mg8Sb2 cuboctahedra, edges with two equivalent K(1)Mg10Sb2 cuboctahedra, edges with four equivalent Mg(1)K2Mg8Sb2 cuboctahedra, faces with two equivalent K(1)Mg10Sb2 cuboctahedra, faces with two equivalent Sb(1)K2Mg10 cuboctahedra, and faces with four equivalent Mg(1)K2Mg8Sb2 cuboctahedra. is represented by the CIF file [CIF]
data_KMg6Sb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.817
_cell_length_b   6.817
_cell_length_c   5.269
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   121.879
_symmetry_Int_Tables_number   1
_cell_volume   207.938
_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
  K  K0  1  0.833  0.167  0.500  1.0
  Mg  Mg1  1  0.335  0.169  0.500  1.0
  Mg  Mg2  1  0.831  0.665  0.500  1.0
  Mg  Mg3  1  0.175  0.336  0.000  1.0
  Mg  Mg4  1  0.664  0.825  0.000  1.0
  Mg  Mg5  1  0.661  0.339  0.000  1.0
  Mg  Mg6  1  0.165  0.835  0.000  1.0
  Sb  Sb7  1  0.335  0.665  0.500  1.0
[/CIF]
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The crystal structure described by KMg6Sb crystallizes in the orthorhombic Amm2 space group. K(1) is bonded to two equivalent Mg(3), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Sb(1) atoms to form KMg10Sb2 cuboctahedra that share corners with four equivalent Sb(1)K2Mg10 cuboctahedra, corners with six equivalent K(1)Mg10Sb2 cuboctahedra, corners with eight equivalent Mg(1)K2Mg8Sb2 cuboctahedra, edges with two equivalent Sb(1)K2Mg10 cuboctahedra, edges with four equivalent Mg(1)K2Mg8Sb2 cuboctahedra, faces with two equivalent K(1)Mg10Sb2 cuboctahedra, faces with two equivalent Sb(1)K2Mg10 cuboctahedra, and faces with four equivalent Mg(1)K2Mg8Sb2 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent K(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Sb(1) atoms to form distorted MgK2Mg8Sb2 cuboctahedra that share corners with four equivalent K(1)Mg10Sb2 cuboctahedra, corners with four equivalent Sb(1)K2Mg10 cuboctahedra, corners with ten equivalent Mg(1)K2Mg8Sb2 cuboctahedra, edges with two equivalent K(1)Mg10Sb2 cuboctahedra, edges with two equivalent Mg(1)K2Mg8Sb2 cuboctahedra, edges with two equivalent Sb(1)K2Mg10 cuboctahedra, faces with two equivalent K(1)Mg10Sb2 cuboctahedra, faces with two equivalent Sb(1)K2Mg10 cuboctahedra, and faces with four equivalent Mg(1)K2Mg8Sb2 cuboctahedra. In the second Mg site, Mg(2) is bonded in a 4-coordinate geometry to two equivalent K(1), two equivalent Mg(1), and two equivalent Sb(1) atoms. In the third Mg site, Mg(3) is bonded in a 2-coordinate geometry to two equivalent K(1) and four equivalent Mg(1) atoms. In the fourth Mg site, Mg(4) is bonded in a distorted water-like geometry to four equivalent Mg(1) and two equivalent Sb(1) atoms. Sb(1) is bonded to two equivalent K(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(2) atoms to form SbK2Mg10 cuboctahedra that share corners with four equivalent K(1)Mg10Sb2 cuboctahedra, corners with six equivalent Sb(1)K2Mg10 cuboctahedra, corners with eight equivalent Mg(1)K2Mg8Sb2 cuboctahedra, edges with two equivalent K(1)Mg10Sb2 cuboctahedra, edges with four equivalent Mg(1)K2Mg8Sb2 cuboctahedra, faces with two equivalent K(1)Mg10Sb2 cuboctahedra, faces with two equivalent Sb(1)K2Mg10 cuboctahedra, and faces with four equivalent Mg(1)K2Mg8Sb2 cuboctahedra. is represented by the CIF file [CIF]
data_KMg6Sb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.817
_cell_length_b   6.817
_cell_length_c   5.269
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   121.879
_symmetry_Int_Tables_number   1
_cell_volume   207.938
_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
  K  K0  1  0.833  0.167  0.500  1.0
  Mg  Mg1  1  0.335  0.169  0.500  1.0
  Mg  Mg2  1  0.831  0.665  0.500  1.0
  Mg  Mg3  1  0.175  0.336  0.000  1.0
  Mg  Mg4  1  0.664  0.825  0.000  1.0
  Mg  Mg5  1  0.661  0.339  0.000  1.0
  Mg  Mg6  1  0.165  0.835  0.000  1.0
  Sb  Sb7  1  0.335  0.665  0.500  1.0
[/CIF]
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