The material structure described by BeTmCu4 crystallizes in the trigonal R3m space group. Be(1) is bonded to three equivalent Tm(1), three equivalent Cu(2), and six equivalent Cu(1) atoms to form a mixture of distorted corner and edge-sharing BeTm3Cu9 cuboctahedra. Tm(1) is bonded in a 16-coordinate geometry to three equivalent Be(1), four equivalent Cu(2), and nine equivalent Cu(1) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(2) is bonded in a 16-coordinate geometry to three equivalent Be(1), four equivalent Tm(1), and nine equivalent Cu(1) atoms. In the second Cu site, Cu(1) is bonded in a 12-coordinate geometry to two equivalent Be(1), three equivalent Tm(1), three equivalent Cu(2), and four equivalent Cu(1) atoms. is represented by the CIF file [CIF]
data_TmBeCu4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.748
_cell_length_b   4.748
_cell_length_c   4.748
_cell_angle_alpha   61.962
_cell_angle_beta   61.962
_cell_angle_gamma   61.962
_symmetry_Int_Tables_number   1
_cell_volume   79.026
_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
  Tm  Tm0  1  0.998  0.998  0.998  1.0
  Be  Be1  1  0.380  0.380  0.380  1.0
  Cu  Cu2  1  0.378  0.378  0.872  1.0
  Cu  Cu3  1  0.872  0.378  0.378  1.0
  Cu  Cu4  1  0.378  0.872  0.378  1.0
  Cu  Cu5  1  0.745  0.745  0.745  1.0
[/CIF]
.
The material structure described by BeTmCu4 crystallizes in the trigonal R3m space group. Be(1) is bonded to three equivalent Tm(1), three equivalent Cu(2), and six equivalent Cu(1) atoms to form a mixture of distorted corner and edge-sharing BeTm3Cu9 cuboctahedra. Tm(1) is bonded in a 16-coordinate geometry to three equivalent Be(1), four equivalent Cu(2), and nine equivalent Cu(1) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(2) is bonded in a 16-coordinate geometry to three equivalent Be(1), four equivalent Tm(1), and nine equivalent Cu(1) atoms. In the second Cu site, Cu(1) is bonded in a 12-coordinate geometry to two equivalent Be(1), three equivalent Tm(1), three equivalent Cu(2), and four equivalent Cu(1) atoms. is represented by the CIF file [CIF]
data_TmBeCu4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.748
_cell_length_b   4.748
_cell_length_c   4.748
_cell_angle_alpha   61.962
_cell_angle_beta   61.962
_cell_angle_gamma   61.962
_symmetry_Int_Tables_number   1
_cell_volume   79.026
_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
  Tm  Tm0  1  0.998  0.998  0.998  1.0
  Be  Be1  1  0.380  0.380  0.380  1.0
  Cu  Cu2  1  0.378  0.378  0.872  1.0
  Cu  Cu3  1  0.872  0.378  0.378  1.0
  Cu  Cu4  1  0.378  0.872  0.378  1.0
  Cu  Cu5  1  0.745  0.745  0.745  1.0
[/CIF]
.