The material described by RbMg14Cr crystallizes in the hexagonal P-6m2 space group. Rb(1) is bonded to six equivalent Mg(1) and six equivalent Mg(3) atoms to form RbMg12 cuboctahedra that share corners with six equivalent Rb(1)Mg12 cuboctahedra, corners with twelve equivalent Mg(2)Mg10Cr2 cuboctahedra, faces with two equivalent Cr(1)Mg12 cuboctahedra, and faces with six equivalent Mg(4)Mg12 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 2-coordinate geometry to two equivalent Rb(1), two equivalent Mg(4), and four equivalent Mg(3) atoms. In the second Mg site, Mg(2) is bonded to two equivalent Mg(4), four equivalent Mg(2), four equivalent Mg(3), and two equivalent Cr(1) atoms to form distorted MgMg10Cr2 cuboctahedra that share corners with four equivalent Rb(1)Mg12 cuboctahedra, corners with six equivalent Mg(2)Mg10Cr2 cuboctahedra, edges with two equivalent Cr(1)Mg12 cuboctahedra, edges with four equivalent Mg(2)Mg10Cr2 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Cr(1)Mg12 cuboctahedra, and faces with four equivalent Mg(2)Mg10Cr2 cuboctahedra. In the third Mg site, Mg(3) is bonded in a 12-coordinate geometry to one Rb(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), four equivalent Mg(3), and one Cr(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 MgMg12 cuboctahedra that share corners with six equivalent Mg(4)Mg12 cuboctahedra, edges with six equivalent Mg(2)Mg10Cr2 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with three equivalent Rb(1)Mg12 cuboctahedra, faces with three equivalent Mg(2)Mg10Cr2 cuboctahedra, and faces with three equivalent Cr(1)Mg12 cuboctahedra. Cr(1) is bonded to six equivalent Mg(2) and six equivalent Mg(3) atoms to form CrMg12 cuboctahedra that share corners with six equivalent Cr(1)Mg12 cuboctahedra, edges with six equivalent Mg(2)Mg10Cr2 cuboctahedra, faces with two equivalent Rb(1)Mg12 cuboctahedra, faces with six equivalent Mg(2)Mg10Cr2 cuboctahedra, and faces with six equivalent Mg(4)Mg12 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_RbMg14Cr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.494
_cell_length_b   6.494
_cell_length_c   10.708
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   391.144
_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
  Rb  Rb0  1  0.167  0.333  0.125  1.0
  Mg  Mg1  1  0.173  0.836  0.125  1.0
  Mg  Mg2  1  0.162  0.831  0.625  1.0
  Mg  Mg3  1  0.664  0.327  0.125  1.0
  Mg  Mg4  1  0.669  0.338  0.625  1.0
  Mg  Mg5  1  0.664  0.836  0.125  1.0
  Mg  Mg6  1  0.669  0.831  0.625  1.0
  Mg  Mg7  1  0.336  0.164  0.397  1.0
  Mg  Mg8  1  0.336  0.164  0.853  1.0
  Mg  Mg9  1  0.336  0.672  0.397  1.0
  Mg  Mg10  1  0.336  0.672  0.853  1.0
  Mg  Mg11  1  0.828  0.164  0.397  1.0
  Mg  Mg12  1  0.828  0.164  0.853  1.0
  Mg  Mg13  1  0.833  0.667  0.369  1.0
  Mg  Mg14  1  0.833  0.667  0.881  1.0
  Cr  Cr15  1  0.167  0.333  0.625  1.0
[/CIF]
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The material described by RbMg14Cr crystallizes in the hexagonal P-6m2 space group. Rb(1) is bonded to six equivalent Mg(1) and six equivalent Mg(3) atoms to form RbMg12 cuboctahedra that share corners with six equivalent Rb(1)Mg12 cuboctahedra, corners with twelve equivalent Mg(2)Mg10Cr2 cuboctahedra, faces with two equivalent Cr(1)Mg12 cuboctahedra, and faces with six equivalent Mg(4)Mg12 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 2-coordinate geometry to two equivalent Rb(1), two equivalent Mg(4), and four equivalent Mg(3) atoms. In the second Mg site, Mg(2) is bonded to two equivalent Mg(4), four equivalent Mg(2), four equivalent Mg(3), and two equivalent Cr(1) atoms to form distorted MgMg10Cr2 cuboctahedra that share corners with four equivalent Rb(1)Mg12 cuboctahedra, corners with six equivalent Mg(2)Mg10Cr2 cuboctahedra, edges with two equivalent Cr(1)Mg12 cuboctahedra, edges with four equivalent Mg(2)Mg10Cr2 cuboctahedra, edges with four equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with two equivalent Cr(1)Mg12 cuboctahedra, and faces with four equivalent Mg(2)Mg10Cr2 cuboctahedra. In the third Mg site, Mg(3) is bonded in a 12-coordinate geometry to one Rb(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), four equivalent Mg(3), and one Cr(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 MgMg12 cuboctahedra that share corners with six equivalent Mg(4)Mg12 cuboctahedra, edges with six equivalent Mg(2)Mg10Cr2 cuboctahedra, faces with two equivalent Mg(4)Mg12 cuboctahedra, faces with three equivalent Rb(1)Mg12 cuboctahedra, faces with three equivalent Mg(2)Mg10Cr2 cuboctahedra, and faces with three equivalent Cr(1)Mg12 cuboctahedra. Cr(1) is bonded to six equivalent Mg(2) and six equivalent Mg(3) atoms to form CrMg12 cuboctahedra that share corners with six equivalent Cr(1)Mg12 cuboctahedra, edges with six equivalent Mg(2)Mg10Cr2 cuboctahedra, faces with two equivalent Rb(1)Mg12 cuboctahedra, faces with six equivalent Mg(2)Mg10Cr2 cuboctahedra, and faces with six equivalent Mg(4)Mg12 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_RbMg14Cr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.494
_cell_length_b   6.494
_cell_length_c   10.708
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   391.144
_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
  Rb  Rb0  1  0.167  0.333  0.125  1.0
  Mg  Mg1  1  0.173  0.836  0.125  1.0
  Mg  Mg2  1  0.162  0.831  0.625  1.0
  Mg  Mg3  1  0.664  0.327  0.125  1.0
  Mg  Mg4  1  0.669  0.338  0.625  1.0
  Mg  Mg5  1  0.664  0.836  0.125  1.0
  Mg  Mg6  1  0.669  0.831  0.625  1.0
  Mg  Mg7  1  0.336  0.164  0.397  1.0
  Mg  Mg8  1  0.336  0.164  0.853  1.0
  Mg  Mg9  1  0.336  0.672  0.397  1.0
  Mg  Mg10  1  0.336  0.672  0.853  1.0
  Mg  Mg11  1  0.828  0.164  0.397  1.0
  Mg  Mg12  1  0.828  0.164  0.853  1.0
  Mg  Mg13  1  0.833  0.667  0.369  1.0
  Mg  Mg14  1  0.833  0.667  0.881  1.0
  Cr  Cr15  1  0.167  0.333  0.625  1.0
[/CIF]
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