data_SrAcPm2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.13
_cell_length_b   6.13
_cell_length_c   6.13
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrAcPm2
_chemical_formula_sum   'Sr1 Ac1 Pm2'
_cell_volume   162.77
_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
  Sr  Sr3  1  0.0  0.0  0.0  1.0
  Ac  Ac0  1  0.33  0.33  0.33  1.0
  Pm  Pm1  1  0.17  0.17  0.17  1.0
  Pm  Pm2  1  0.5  0.5  0.5  1.0

data_SrAcPm2
_symmetry_space_group_name_H-M   R3m
_cell_length_a   6.13
_cell_length_b   6.13
_cell_length_c   15.01
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   SrAcPm2
_chemical_formula_sum   'Sr3 Ac3 Pm6'
_cell_volume   488.3
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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
  Sr  Sr0  3  0.0  0.0  0.0  1.0
  Ac  Ac1  3  0.0  0.0  0.67  1.0
  Pm  Pm2  3  0.0  0.0  0.5  1.0
  Pm  Pm3  3  0.0  0.0  0.83  1.0

Sr Ac Pm Pm
SrAcPm2 crystallizes in the trigonal R3m space group. Sr(1) is bonded in a distorted single-bond geometry to three equivalent Ac(1) and one Pm(1) atom. All Sr(1)-Ac(1) bond lengths are 3.54 Å. The Sr(1)-Pm(1) bond length is 2.50 Å. Ac(1) is bonded to three equivalent Sr(1), one Pm(1), and one Pm(2) atom to form distorted corner-sharing AcSr3Pm2 trigonal bipyramids. The Ac(1)-Pm(1) bond length is 2.50 Å. The Ac(1)-Pm(2) bond length is 2.50 Å. There are two inequivalent Pm sites. In the first Pm site, Pm(1) is bonded in a distorted linear geometry to one Sr(1) and one Ac(1) atom. In the second Pm site, Pm(2) is bonded in a distorted single-bond geometry to one Ac(1) atom.