The compound described by MgLa5 crystallizes in the trigonal R32 space group. Mg(1) is bonded to six equivalent La(1) and six equivalent La(2) atoms to form MgLa12 cuboctahedra that share corners with six equivalent Mg(1)La12 cuboctahedra, corners with twelve equivalent La(2)La9Mg3 cuboctahedra, edges with six equivalent Mg(1)La12 cuboctahedra, and faces with eight equivalent La(2)La9Mg3 cuboctahedra. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), four equivalent La(1), and four equivalent La(2) atoms. In the second La site, La(2) is bonded to three equivalent Mg(1), three equivalent La(2), and six equivalent La(1) atoms to form distorted LaLa9Mg3 cuboctahedra that share corners with six equivalent Mg(1)La12 cuboctahedra, corners with twelve equivalent La(2)La9Mg3 cuboctahedra, edges with six equivalent La(2)La9Mg3 cuboctahedra, faces with four equivalent Mg(1)La12 cuboctahedra, and faces with four equivalent La(2)La9Mg3 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_La5Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.904
_cell_length_b   6.904
_cell_length_c   6.904
_cell_angle_alpha   55.689
_cell_angle_beta   55.689
_cell_angle_gamma   55.689
_symmetry_Int_Tables_number   1
_cell_volume   209.449
_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
  La  La0  1  0.000  0.620  0.380  1.0
  La  La1  1  0.153  0.153  0.153  1.0
  La  La2  1  0.380  0.000  0.620  1.0
  La  La3  1  0.620  0.380  0.000  1.0
  La  La4  1  0.847  0.847  0.847  1.0
  Mg  Mg5  1  0.500  0.500  0.500  1.0
[/CIF]
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The compound described by MgLa5 crystallizes in the trigonal R32 space group. Mg(1) is bonded to six equivalent La(1) and six equivalent La(2) atoms to form MgLa12 cuboctahedra that share corners with six equivalent Mg(1)La12 cuboctahedra, corners with twelve equivalent La(2)La9Mg3 cuboctahedra, edges with six equivalent Mg(1)La12 cuboctahedra, and faces with eight equivalent La(2)La9Mg3 cuboctahedra. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), four equivalent La(1), and four equivalent La(2) atoms. In the second La site, La(2) is bonded to three equivalent Mg(1), three equivalent La(2), and six equivalent La(1) atoms to form distorted LaLa9Mg3 cuboctahedra that share corners with six equivalent Mg(1)La12 cuboctahedra, corners with twelve equivalent La(2)La9Mg3 cuboctahedra, edges with six equivalent La(2)La9Mg3 cuboctahedra, faces with four equivalent Mg(1)La12 cuboctahedra, and faces with four equivalent La(2)La9Mg3 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_La5Mg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.904
_cell_length_b   6.904
_cell_length_c   6.904
_cell_angle_alpha   55.689
_cell_angle_beta   55.689
_cell_angle_gamma   55.689
_symmetry_Int_Tables_number   1
_cell_volume   209.449
_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
  La  La0  1  0.000  0.620  0.380  1.0
  La  La1  1  0.153  0.153  0.153  1.0
  La  La2  1  0.380  0.000  0.620  1.0
  La  La3  1  0.620  0.380  0.000  1.0
  La  La4  1  0.847  0.847  0.847  1.0
  Mg  Mg5  1  0.500  0.500  0.500  1.0
[/CIF]
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