The structure described by Tm3Cu4Sn4 crystallizes in the orthorhombic Immm space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded to two equivalent Sn(1) and four equivalent Sn(2) atoms to form distorted edge-sharing TmSn6 octahedra. In the second Tm site, Tm(2) is bonded in a 12-coordinate geometry to six equivalent Cu(1), two equivalent Sn(1), and four equivalent Sn(2) atoms. Cu(1) is bonded in a 8-coordinate geometry to three equivalent Tm(2), one Cu(1), one Sn(2), and three equivalent Sn(1) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to one Tm(1), two equivalent Tm(2), and six equivalent Cu(1) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to two equivalent Tm(1), four equivalent Tm(2), two equivalent Cu(1), and one Sn(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Tm3(CuSn)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.404
_cell_length_b   6.883
_cell_length_c   8.323
_cell_angle_alpha   114.424
_cell_angle_beta   105.340
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   219.807
_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  0.000  0.000  0.000  1.0
  Tm  Tm1  1  0.869  0.369  0.738  1.0
  Tm  Tm2  1  0.131  0.631  0.262  1.0
  Cu  Cu3  1  0.328  0.017  0.656  1.0
  Cu  Cu4  1  0.328  0.640  0.656  1.0
  Cu  Cu5  1  0.672  0.983  0.344  1.0
  Cu  Cu6  1  0.672  0.360  0.344  1.0
  Sn  Sn7  1  0.216  0.216  0.433  1.0
  Sn  Sn8  1  0.784  0.784  0.567  1.0
  Sn  Sn9  1  0.500  0.296  0.000  1.0
  Sn  Sn10  1  0.500  0.704  0.000  1.0
[/CIF]
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The structure described by Tm3Cu4Sn4 crystallizes in the orthorhombic Immm space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded to two equivalent Sn(1) and four equivalent Sn(2) atoms to form distorted edge-sharing TmSn6 octahedra. In the second Tm site, Tm(2) is bonded in a 12-coordinate geometry to six equivalent Cu(1), two equivalent Sn(1), and four equivalent Sn(2) atoms. Cu(1) is bonded in a 8-coordinate geometry to three equivalent Tm(2), one Cu(1), one Sn(2), and three equivalent Sn(1) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to one Tm(1), two equivalent Tm(2), and six equivalent Cu(1) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to two equivalent Tm(1), four equivalent Tm(2), two equivalent Cu(1), and one Sn(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Tm3(CuSn)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.404
_cell_length_b   6.883
_cell_length_c   8.323
_cell_angle_alpha   114.424
_cell_angle_beta   105.340
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   219.807
_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  0.000  0.000  0.000  1.0
  Tm  Tm1  1  0.869  0.369  0.738  1.0
  Tm  Tm2  1  0.131  0.631  0.262  1.0
  Cu  Cu3  1  0.328  0.017  0.656  1.0
  Cu  Cu4  1  0.328  0.640  0.656  1.0
  Cu  Cu5  1  0.672  0.983  0.344  1.0
  Cu  Cu6  1  0.672  0.360  0.344  1.0
  Sn  Sn7  1  0.216  0.216  0.433  1.0
  Sn  Sn8  1  0.784  0.784  0.567  1.0
  Sn  Sn9  1  0.500  0.296  0.000  1.0
  Sn  Sn10  1  0.500  0.704  0.000  1.0
[/CIF]
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