data_AcEr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.79
_cell_length_b   3.79
_cell_length_c   5.98
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AcEr
_chemical_formula_sum   'Ac1 Er1'
_cell_volume   74.44
_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  0.0  0.19  0.99  1.0
  Er  Er1  1  0.0  0.0  0.0  1.0

data_AcEr
_symmetry_space_group_name_H-M   Amm2
_cell_length_a   5.98
_cell_length_b   6.56
_cell_length_c   3.79
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   38
_chemical_formula_structural   AcEr
_chemical_formula_sum   'Ac2 Er2'
_cell_volume   148.89
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-x, -y, z'
  3  '-x, y, z'
  4  'x, -y, z'
  5  'x, y+1/2, z+1/2'
  6  '-x, -y+1/2, z+1/2'
  7  '-x, y+1/2, z+1/2'
  8  'x, -y+1/2, z+1/2'
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  2  0.5  0.0  0.19  1.0
  Er  Er1  2  0.5  0.0  1.0  1.0

Ac Er
AcEr crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two AcEr clusters. Ac(1) is bonded in a single-bond geometry to one Er(1) atom. The Ac(1)-Er(1) bond length is 0.72 Å. Er(1) is bonded in a single-bond geometry to one Ac(1) atom.