data_ErP
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.87
_cell_length_b   3.87
_cell_length_c   3.53
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   ErP
_chemical_formula_sum   'Er1 P1'
_cell_volume   45.7
_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
  Er  Er0  1  0.0  0.23  0.77  1.0
  P  P1  1  0.0  0.0  0.0  1.0

data_ErP
_symmetry_space_group_name_H-M   Cm
_cell_length_a   3.87
_cell_length_b   6.7
_cell_length_c   3.53
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   ErP
_chemical_formula_sum   'Er2 P2'
_cell_volume   91.41
_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+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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
  Er  Er0  2  0.23  0.0  0.77  1.0
  P  P1  2  0.0  0.0  0.0  1.0

Er P
ErP is Hg_xSn structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two phosphanylidyneerbium molecules. Er(1) is bonded in a distorted single-bond geometry to one P(1) atom. The Er(1)-P(1) bond length is 1.22 Å. P(1) is bonded in a distorted single-bond geometry to one Er(1) atom.