The structure described by AcPm3 is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. Ac(1) is bonded to four equivalent Pm(2) and eight equivalent Pm(1) atoms to form AcPm12 cuboctahedra that share corners with four equivalent Ac(1)Pm12 cuboctahedra, corners with eight equivalent Pm(2)Ac4Pm8 cuboctahedra, edges with eight equivalent Ac(1)Pm12 cuboctahedra, edges with sixteen equivalent Pm(1)Ac4Pm8 cuboctahedra, faces with four equivalent Ac(1)Pm12 cuboctahedra, faces with six equivalent Pm(2)Ac4Pm8 cuboctahedra, and faces with eight equivalent Pm(1)Ac4Pm8 cuboctahedra. There are two inequivalent Pm sites. In the first Pm site, Pm(1) is bonded to four equivalent Ac(1), four equivalent Pm(1), and four equivalent Pm(2) atoms to form PmAc4Pm8 cuboctahedra that share corners with twelve equivalent Pm(1)Ac4Pm8 cuboctahedra, edges with eight equivalent Ac(1)Pm12 cuboctahedra, edges with eight equivalent Pm(1)Ac4Pm8 cuboctahedra, edges with eight equivalent Pm(2)Ac4Pm8 cuboctahedra, faces with four equivalent Ac(1)Pm12 cuboctahedra, faces with four equivalent Pm(2)Ac4Pm8 cuboctahedra, and faces with ten equivalent Pm(1)Ac4Pm8 cuboctahedra. In the second Pm site, Pm(2) is bonded to four equivalent Ac(1) and eight equivalent Pm(1) atoms to form PmAc4Pm8 cuboctahedra that share corners with four equivalent Pm(2)Ac4Pm8 cuboctahedra, corners with eight equivalent Ac(1)Pm12 cuboctahedra, edges with eight equivalent Pm(2)Ac4Pm8 cuboctahedra, edges with sixteen equivalent Pm(1)Ac4Pm8 cuboctahedra, faces with four equivalent Pm(2)Ac4Pm8 cuboctahedra, faces with six equivalent Ac(1)Pm12 cuboctahedra, and faces with eight equivalent Pm(1)Ac4Pm8 cuboctahedra. is represented by the CIF card [CIF]
data_AcPm3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.448
_cell_length_b   6.448
_cell_length_c   6.448
_cell_angle_alpha   131.168
_cell_angle_beta   131.168
_cell_angle_gamma   71.547
_symmetry_Int_Tables_number   1
_cell_volume   148.649
_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
  Ac  Ac0  1  0.000  0.000  0.000  1.0
  Pm  Pm1  1  0.750  0.250  0.500  1.0
  Pm  Pm2  1  0.250  0.750  0.500  1.0
  Pm  Pm3  1  0.500  0.500  0.000  1.0
[/CIF]
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The structure described by AcPm3 is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. Ac(1) is bonded to four equivalent Pm(2) and eight equivalent Pm(1) atoms to form AcPm12 cuboctahedra that share corners with four equivalent Ac(1)Pm12 cuboctahedra, corners with eight equivalent Pm(2)Ac4Pm8 cuboctahedra, edges with eight equivalent Ac(1)Pm12 cuboctahedra, edges with sixteen equivalent Pm(1)Ac4Pm8 cuboctahedra, faces with four equivalent Ac(1)Pm12 cuboctahedra, faces with six equivalent Pm(2)Ac4Pm8 cuboctahedra, and faces with eight equivalent Pm(1)Ac4Pm8 cuboctahedra. There are two inequivalent Pm sites. In the first Pm site, Pm(1) is bonded to four equivalent Ac(1), four equivalent Pm(1), and four equivalent Pm(2) atoms to form PmAc4Pm8 cuboctahedra that share corners with twelve equivalent Pm(1)Ac4Pm8 cuboctahedra, edges with eight equivalent Ac(1)Pm12 cuboctahedra, edges with eight equivalent Pm(1)Ac4Pm8 cuboctahedra, edges with eight equivalent Pm(2)Ac4Pm8 cuboctahedra, faces with four equivalent Ac(1)Pm12 cuboctahedra, faces with four equivalent Pm(2)Ac4Pm8 cuboctahedra, and faces with ten equivalent Pm(1)Ac4Pm8 cuboctahedra. In the second Pm site, Pm(2) is bonded to four equivalent Ac(1) and eight equivalent Pm(1) atoms to form PmAc4Pm8 cuboctahedra that share corners with four equivalent Pm(2)Ac4Pm8 cuboctahedra, corners with eight equivalent Ac(1)Pm12 cuboctahedra, edges with eight equivalent Pm(2)Ac4Pm8 cuboctahedra, edges with sixteen equivalent Pm(1)Ac4Pm8 cuboctahedra, faces with four equivalent Pm(2)Ac4Pm8 cuboctahedra, faces with six equivalent Ac(1)Pm12 cuboctahedra, and faces with eight equivalent Pm(1)Ac4Pm8 cuboctahedra. is represented by the CIF card [CIF]
data_AcPm3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.448
_cell_length_b   6.448
_cell_length_c   6.448
_cell_angle_alpha   131.168
_cell_angle_beta   131.168
_cell_angle_gamma   71.547
_symmetry_Int_Tables_number   1
_cell_volume   148.649
_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
  Ac  Ac0  1  0.000  0.000  0.000  1.0
  Pm  Pm1  1  0.750  0.250  0.500  1.0
  Pm  Pm2  1  0.250  0.750  0.500  1.0
  Pm  Pm3  1  0.500  0.500  0.000  1.0
[/CIF]
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