data_Er2Al3Co
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.31
_cell_length_b   5.31
_cell_length_c   5.31
_cell_angle_alpha   61.66
_cell_angle_beta   61.66
_cell_angle_gamma   61.66
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Er2Al3Co
_chemical_formula_sum   'Er2 Al3 Co1'
_cell_volume   109.72
_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  0.0  0.05  1.0
  Er  Er1  1  0.0  0.0  0.79  1.0
  Al  Al2  1  0.64  0.79  0.14  1.0
  Al  Al3  1  0.36  0.79  0.14  1.0
  Al  Al4  1  0.0  0.43  0.14  1.0
  Co  Co5  1  0.0  0.0  0.0  1.0

data_Er2Al3Co
_symmetry_space_group_name_H-M   P1
_cell_length_a   5.31
_cell_length_b   5.31
_cell_length_c   5.31
_cell_angle_alpha   61.66
_cell_angle_beta   61.66
_cell_angle_gamma   61.66
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Er2Al3Co
_chemical_formula_sum   'Er2 Al3 Co1'
_cell_volume   109.72
_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  0.0  0.21  1.0
  Er  Er1  1  0.0  0.0  0.95  1.0
  Al  Al2  1  0.21  0.36  0.86  1.0
  Al  Al3  1  0.21  0.64  0.86  1.0
  Al  Al4  1  0.57  0.0  0.86  1.0
  Co  Co5  1  0.0  0.0  0.0  1.0

Er Er Al Al Al Co
Er Er Al Al Al Co 0 5 o o o 1 5 o o + 2 3 o o o 2 4 + o o 
Er2CoAl3 crystallizes in the triclinic P1 space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a single-bond geometry to one Co(1), one Al(1), one Al(2), and one Al(3) atom. The Er(1)-Co(1) bond length is 0.25 Å. The Er(1)-Al(1) bond length is 2.42 Å. The Er(1)-Al(2) bond length is 1.87 Å. The Er(1)-Al(3) bond length is 2.55 Å. In the second Er site, Er(2) is bonded in a single-bond geometry to one Co(1), two equivalent Al(1), and two equivalent Al(3) atoms. The Er(2)-Co(1) bond length is 1.11 Å. There is one shorter (2.26 Å) and one longer (3.70 Å) Er(2)-Al(1) bond length. There is one shorter (2.70 Å) and one longer (3.11 Å) Er(2)-Al(3) bond length. Co(1) is bonded in a distorted single-bond geometry to one Er(1), one Er(2), and one Al(1) atom. The Co(1)-Al(1) bond length is 2.33 Å. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a 6-coordinate geometry to one Er(1), two equivalent Er(2), one Co(1), one Al(2), and one Al(3) atom. The Al(1)-Al(2) bond length is 1.48 Å. The Al(1)-Al(3) bond length is 1.95 Å. In the second Al site, Al(2) is bonded in a distorted bent 150 degrees geometry to one Er(1) and one Al(1) atom. In the third Al site, Al(3) is bonded in a 4-coordinate geometry to one Er(1), two equivalent Er(2), and one Al(1) atom.