The material structure described by ErPm3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Er(1) is bonded to four equivalent Pm(2) and eight equivalent Pm(1) atoms to form ErPm12 cuboctahedra that share corners with four equivalent Er(1)Pm12 cuboctahedra, corners with eight equivalent Pm(2)Pm8Er4 cuboctahedra, edges with eight equivalent Er(1)Pm12 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Er4 cuboctahedra, faces with four equivalent Er(1)Pm12 cuboctahedra, faces with six equivalent Pm(2)Pm8Er4 cuboctahedra, and faces with eight equivalent Pm(1)Pm8Er4 cuboctahedra. There are two inequivalent Pm sites. In the first Pm site, Pm(1) is bonded to four equivalent Er(1), four equivalent Pm(1), and four equivalent Pm(2) atoms to form PmPm8Er4 cuboctahedra that share corners with twelve equivalent Pm(1)Pm8Er4 cuboctahedra, edges with eight equivalent Er(1)Pm12 cuboctahedra, edges with eight equivalent Pm(1)Pm8Er4 cuboctahedra, edges with eight equivalent Pm(2)Pm8Er4 cuboctahedra, faces with four equivalent Er(1)Pm12 cuboctahedra, faces with four equivalent Pm(2)Pm8Er4 cuboctahedra, and faces with ten equivalent Pm(1)Pm8Er4 cuboctahedra. In the second Pm site, Pm(2) is bonded to four equivalent Er(1) and eight equivalent Pm(1) atoms to form PmPm8Er4 cuboctahedra that share corners with four equivalent Pm(2)Pm8Er4 cuboctahedra, corners with eight equivalent Er(1)Pm12 cuboctahedra, edges with eight equivalent Pm(2)Pm8Er4 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Er4 cuboctahedra, faces with four equivalent Pm(2)Pm8Er4 cuboctahedra, faces with six equivalent Er(1)Pm12 cuboctahedra, and faces with eight equivalent Pm(1)Pm8Er4 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Pm3Er
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.264
_cell_length_b   6.264
_cell_length_c   6.264
_cell_angle_alpha   131.808
_cell_angle_beta   131.808
_cell_angle_gamma   70.533
_symmetry_Int_Tables_number   1
_cell_volume   133.769
_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
  Pm  Pm0  1  0.750  0.250  0.500  1.0
  Pm  Pm1  1  0.250  0.750  0.500  1.0
  Pm  Pm2  1  0.500  0.500  0.000  1.0
  Er  Er3  1  0.000  0.000  0.000  1.0
[/CIF]
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The material structure described by ErPm3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. Er(1) is bonded to four equivalent Pm(2) and eight equivalent Pm(1) atoms to form ErPm12 cuboctahedra that share corners with four equivalent Er(1)Pm12 cuboctahedra, corners with eight equivalent Pm(2)Pm8Er4 cuboctahedra, edges with eight equivalent Er(1)Pm12 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Er4 cuboctahedra, faces with four equivalent Er(1)Pm12 cuboctahedra, faces with six equivalent Pm(2)Pm8Er4 cuboctahedra, and faces with eight equivalent Pm(1)Pm8Er4 cuboctahedra. There are two inequivalent Pm sites. In the first Pm site, Pm(1) is bonded to four equivalent Er(1), four equivalent Pm(1), and four equivalent Pm(2) atoms to form PmPm8Er4 cuboctahedra that share corners with twelve equivalent Pm(1)Pm8Er4 cuboctahedra, edges with eight equivalent Er(1)Pm12 cuboctahedra, edges with eight equivalent Pm(1)Pm8Er4 cuboctahedra, edges with eight equivalent Pm(2)Pm8Er4 cuboctahedra, faces with four equivalent Er(1)Pm12 cuboctahedra, faces with four equivalent Pm(2)Pm8Er4 cuboctahedra, and faces with ten equivalent Pm(1)Pm8Er4 cuboctahedra. In the second Pm site, Pm(2) is bonded to four equivalent Er(1) and eight equivalent Pm(1) atoms to form PmPm8Er4 cuboctahedra that share corners with four equivalent Pm(2)Pm8Er4 cuboctahedra, corners with eight equivalent Er(1)Pm12 cuboctahedra, edges with eight equivalent Pm(2)Pm8Er4 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Er4 cuboctahedra, faces with four equivalent Pm(2)Pm8Er4 cuboctahedra, faces with six equivalent Er(1)Pm12 cuboctahedra, and faces with eight equivalent Pm(1)Pm8Er4 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Pm3Er
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.264
_cell_length_b   6.264
_cell_length_c   6.264
_cell_angle_alpha   131.808
_cell_angle_beta   131.808
_cell_angle_gamma   70.533
_symmetry_Int_Tables_number   1
_cell_volume   133.769
_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
  Pm  Pm0  1  0.750  0.250  0.500  1.0
  Pm  Pm1  1  0.250  0.750  0.500  1.0
  Pm  Pm2  1  0.500  0.500  0.000  1.0
  Er  Er3  1  0.000  0.000  0.000  1.0
[/CIF]
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