The compound described by Ac is alpha La structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Ac sites. In the first Ac site, Ac(1) is bonded to six equivalent Ac(1) and six equivalent Ac(2) atoms to form a mixture of edge, face, and corner-sharing AcAc12 cuboctahedra. In the second Ac site, Ac(2) is bonded to six equivalent Ac(1) and six equivalent Ac(2) atoms to form a mixture of edge, face, and corner-sharing AcAc12 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ac
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.046
_cell_length_b   4.046
_cell_length_c   13.017
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   184.545
_cell_formula_units_Z   4
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
  Ac  Ac0  1  0.000  0.000  0.000  1.0
  Ac  Ac1  1  0.333  0.667  0.250  1.0
  Ac  Ac2  1  0.000  0.000  0.500  1.0
  Ac  Ac3  1  0.667  0.333  0.750  1.0
[/CIF]
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The compound described by Ac is alpha La structured and crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent Ac sites. In the first Ac site, Ac(1) is bonded to six equivalent Ac(1) and six equivalent Ac(2) atoms to form a mixture of edge, face, and corner-sharing AcAc12 cuboctahedra. In the second Ac site, Ac(2) is bonded to six equivalent Ac(1) and six equivalent Ac(2) atoms to form a mixture of edge, face, and corner-sharing AcAc12 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ac
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.046
_cell_length_b   4.046
_cell_length_c   13.017
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   184.545
_cell_formula_units_Z   4
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
  Ac  Ac0  1  0.000  0.000  0.000  1.0
  Ac  Ac1  1  0.333  0.667  0.250  1.0
  Ac  Ac2  1  0.000  0.000  0.500  1.0
  Ac  Ac3  1  0.667  0.333  0.750  1.0
[/CIF]
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