The material structure described by Er3Pm is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded to four equivalent Er(1), four equivalent Er(2), and four equivalent Pm(1) atoms to form ErPm4Er8 cuboctahedra that share corners with twelve equivalent Er(1)Pm4Er8 cuboctahedra, edges with eight equivalent Er(1)Pm4Er8 cuboctahedra, edges with eight equivalent Er(2)Pm4Er8 cuboctahedra, edges with eight equivalent Pm(1)Er12 cuboctahedra, faces with four equivalent Er(2)Pm4Er8 cuboctahedra, faces with four equivalent Pm(1)Er12 cuboctahedra, and faces with ten equivalent Er(1)Pm4Er8 cuboctahedra. In the second Er site, Er(2) is bonded to eight equivalent Er(1) and four equivalent Pm(1) atoms to form ErPm4Er8 cuboctahedra that share corners with four equivalent Er(2)Pm4Er8 cuboctahedra, corners with eight equivalent Pm(1)Er12 cuboctahedra, edges with eight equivalent Er(2)Pm4Er8 cuboctahedra, edges with sixteen equivalent Er(1)Pm4Er8 cuboctahedra, faces with four equivalent Er(2)Pm4Er8 cuboctahedra, faces with six equivalent Pm(1)Er12 cuboctahedra, and faces with eight equivalent Er(1)Pm4Er8 cuboctahedra. Pm(1) is bonded to four equivalent Er(2) and eight equivalent Er(1) atoms to form PmEr12 cuboctahedra that share corners with four equivalent Pm(1)Er12 cuboctahedra, corners with eight equivalent Er(2)Pm4Er8 cuboctahedra, edges with eight equivalent Pm(1)Er12 cuboctahedra, edges with sixteen equivalent Er(1)Pm4Er8 cuboctahedra, faces with four equivalent Pm(1)Er12 cuboctahedra, faces with six equivalent Er(2)Pm4Er8 cuboctahedra, and faces with eight equivalent Er(1)Pm4Er8 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_PmEr3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.131
_cell_length_b   6.131
_cell_length_c   6.131
_cell_angle_alpha   131.722
_cell_angle_beta   131.722
_cell_angle_gamma   70.669
_symmetry_Int_Tables_number   1
_cell_volume   125.762
_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  0.000  0.000  0.000  1.0
  Er  Er1  1  0.750  0.250  0.500  1.0
  Er  Er2  1  0.250  0.750  0.500  1.0
  Er  Er3  1  0.500  0.500  0.000  1.0
[/CIF]
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The material structure described by Er3Pm is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded to four equivalent Er(1), four equivalent Er(2), and four equivalent Pm(1) atoms to form ErPm4Er8 cuboctahedra that share corners with twelve equivalent Er(1)Pm4Er8 cuboctahedra, edges with eight equivalent Er(1)Pm4Er8 cuboctahedra, edges with eight equivalent Er(2)Pm4Er8 cuboctahedra, edges with eight equivalent Pm(1)Er12 cuboctahedra, faces with four equivalent Er(2)Pm4Er8 cuboctahedra, faces with four equivalent Pm(1)Er12 cuboctahedra, and faces with ten equivalent Er(1)Pm4Er8 cuboctahedra. In the second Er site, Er(2) is bonded to eight equivalent Er(1) and four equivalent Pm(1) atoms to form ErPm4Er8 cuboctahedra that share corners with four equivalent Er(2)Pm4Er8 cuboctahedra, corners with eight equivalent Pm(1)Er12 cuboctahedra, edges with eight equivalent Er(2)Pm4Er8 cuboctahedra, edges with sixteen equivalent Er(1)Pm4Er8 cuboctahedra, faces with four equivalent Er(2)Pm4Er8 cuboctahedra, faces with six equivalent Pm(1)Er12 cuboctahedra, and faces with eight equivalent Er(1)Pm4Er8 cuboctahedra. Pm(1) is bonded to four equivalent Er(2) and eight equivalent Er(1) atoms to form PmEr12 cuboctahedra that share corners with four equivalent Pm(1)Er12 cuboctahedra, corners with eight equivalent Er(2)Pm4Er8 cuboctahedra, edges with eight equivalent Pm(1)Er12 cuboctahedra, edges with sixteen equivalent Er(1)Pm4Er8 cuboctahedra, faces with four equivalent Pm(1)Er12 cuboctahedra, faces with six equivalent Er(2)Pm4Er8 cuboctahedra, and faces with eight equivalent Er(1)Pm4Er8 cuboctahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_PmEr3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.131
_cell_length_b   6.131
_cell_length_c   6.131
_cell_angle_alpha   131.722
_cell_angle_beta   131.722
_cell_angle_gamma   70.669
_symmetry_Int_Tables_number   1
_cell_volume   125.762
_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  0.000  0.000  0.000  1.0
  Er  Er1  1  0.750  0.250  0.500  1.0
  Er  Er2  1  0.250  0.750  0.500  1.0
  Er  Er3  1  0.500  0.500  0.000  1.0
[/CIF]
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