The crystal structure described by NdCu9Sn4 is Bergman Structure: Mg32(Al,Zn)49 Bergman-like structured and crystallizes in the tetragonal I4/mcm space group. Nd(1) is bonded in a 24-coordinate geometry to eight equivalent Cu(1), eight equivalent Cu(2), and eight equivalent Sn(1) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 12-coordinate geometry to two equivalent Nd(1), one Cu(3), two equivalent Cu(2), three equivalent Cu(1), and four equivalent Sn(1) atoms. In the second Cu site, Cu(2) is bonded in a 12-coordinate geometry to two equivalent Nd(1), one Cu(3), two equivalent Cu(1), three equivalent Cu(2), and four equivalent Sn(1) atoms. In the third Cu site, Cu(3) is bonded in a cuboctahedral geometry to four equivalent Cu(1), four equivalent Cu(2), and four equivalent Sn(1) atoms. Sn(1) is bonded in a 11-coordinate geometry to two equivalent Nd(1), one Cu(3), four equivalent Cu(1), and four equivalent Cu(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_NdCu9Sn4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.715
_cell_length_b   8.715
_cell_length_c   8.715
_cell_angle_alpha   120.602
_cell_angle_beta   120.602
_cell_angle_gamma   88.961
_symmetry_Int_Tables_number   1
_cell_volume   463.705
_cell_formula_units_Z   2
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
  Nd  Nd0  1  0.750  0.750  0.000  1.0
  Nd  Nd1  1  0.250  0.250  0.000  1.0
  Cu  Cu2  1  0.199  0.056  0.255  1.0
  Cu  Cu3  1  0.783  0.065  0.500  1.0
  Cu  Cu4  1  0.717  0.217  0.282  1.0
  Cu  Cu5  1  0.065  0.565  0.282  1.0
  Cu  Cu6  1  0.556  0.699  0.255  1.0
  Cu  Cu7  1  0.699  0.444  0.143  1.0
  Cu  Cu8  1  0.801  0.944  0.745  1.0
  Cu  Cu9  1  0.217  0.935  0.500  1.0
  Cu  Cu10  1  0.056  0.801  0.857  1.0
  Cu  Cu11  1  0.935  0.435  0.718  1.0
  Cu  Cu12  1  0.283  0.783  0.718  1.0
  Cu  Cu13  1  0.944  0.199  0.143  1.0
  Cu  Cu14  1  0.301  0.556  0.857  1.0
  Cu  Cu15  1  0.435  0.717  0.500  1.0
  Cu  Cu16  1  0.444  0.301  0.745  1.0
  Cu  Cu17  1  0.500  0.000  0.500  1.0
  Cu  Cu18  1  0.000  0.500  0.500  1.0
  Cu  Cu19  1  0.565  0.283  0.500  1.0
  Sn  Sn20  1  0.312  0.442  0.500  1.0
  Sn  Sn21  1  0.812  0.312  0.870  1.0
  Sn  Sn22  1  0.688  0.558  0.500  1.0
  Sn  Sn23  1  0.942  0.812  0.500  1.0
  Sn  Sn24  1  0.058  0.188  0.500  1.0
  Sn  Sn25  1  0.558  0.058  0.870  1.0
  Sn  Sn26  1  0.188  0.688  0.130  1.0
  Sn  Sn27  1  0.442  0.942  0.130  1.0
[/CIF]
.
The crystal structure described by NdCu9Sn4 is Bergman Structure: Mg32(Al,Zn)49 Bergman-like structured and crystallizes in the tetragonal I4/mcm space group. Nd(1) is bonded in a 24-coordinate geometry to eight equivalent Cu(1), eight equivalent Cu(2), and eight equivalent Sn(1) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 12-coordinate geometry to two equivalent Nd(1), one Cu(3), two equivalent Cu(2), three equivalent Cu(1), and four equivalent Sn(1) atoms. In the second Cu site, Cu(2) is bonded in a 12-coordinate geometry to two equivalent Nd(1), one Cu(3), two equivalent Cu(1), three equivalent Cu(2), and four equivalent Sn(1) atoms. In the third Cu site, Cu(3) is bonded in a cuboctahedral geometry to four equivalent Cu(1), four equivalent Cu(2), and four equivalent Sn(1) atoms. Sn(1) is bonded in a 11-coordinate geometry to two equivalent Nd(1), one Cu(3), four equivalent Cu(1), and four equivalent Cu(2) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_NdCu9Sn4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.715
_cell_length_b   8.715
_cell_length_c   8.715
_cell_angle_alpha   120.602
_cell_angle_beta   120.602
_cell_angle_gamma   88.961
_symmetry_Int_Tables_number   1
_cell_volume   463.705
_cell_formula_units_Z   2
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
  Nd  Nd0  1  0.750  0.750  0.000  1.0
  Nd  Nd1  1  0.250  0.250  0.000  1.0
  Cu  Cu2  1  0.199  0.056  0.255  1.0
  Cu  Cu3  1  0.783  0.065  0.500  1.0
  Cu  Cu4  1  0.717  0.217  0.282  1.0
  Cu  Cu5  1  0.065  0.565  0.282  1.0
  Cu  Cu6  1  0.556  0.699  0.255  1.0
  Cu  Cu7  1  0.699  0.444  0.143  1.0
  Cu  Cu8  1  0.801  0.944  0.745  1.0
  Cu  Cu9  1  0.217  0.935  0.500  1.0
  Cu  Cu10  1  0.056  0.801  0.857  1.0
  Cu  Cu11  1  0.935  0.435  0.718  1.0
  Cu  Cu12  1  0.283  0.783  0.718  1.0
  Cu  Cu13  1  0.944  0.199  0.143  1.0
  Cu  Cu14  1  0.301  0.556  0.857  1.0
  Cu  Cu15  1  0.435  0.717  0.500  1.0
  Cu  Cu16  1  0.444  0.301  0.745  1.0
  Cu  Cu17  1  0.500  0.000  0.500  1.0
  Cu  Cu18  1  0.000  0.500  0.500  1.0
  Cu  Cu19  1  0.565  0.283  0.500  1.0
  Sn  Sn20  1  0.312  0.442  0.500  1.0
  Sn  Sn21  1  0.812  0.312  0.870  1.0
  Sn  Sn22  1  0.688  0.558  0.500  1.0
  Sn  Sn23  1  0.942  0.812  0.500  1.0
  Sn  Sn24  1  0.058  0.188  0.500  1.0
  Sn  Sn25  1  0.558  0.058  0.870  1.0
  Sn  Sn26  1  0.188  0.688  0.130  1.0
  Sn  Sn27  1  0.442  0.942  0.130  1.0
[/CIF]
.