The material structure described by Ho3Cu4Sn4 crystallizes in the orthorhombic Immm space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded to two equivalent Sn(1) and four equivalent Sn(2) atoms to form distorted edge-sharing HoSn6 octahedra. In the second Ho site, Ho(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 Ho(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 Ho(1), two equivalent Ho(2), and six equivalent Cu(1) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to two equivalent Ho(1), four equivalent Ho(2), two equivalent Cu(1), and one Sn(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ho3(CuSn)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.367
_cell_length_b   8.367
_cell_length_c   8.367
_cell_angle_alpha   149.358
_cell_angle_beta   131.220
_cell_angle_gamma   58.714
_symmetry_Int_Tables_number   1
_cell_volume   222.838
_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
  Ho  Ho0  1  0.000  0.000  0.000  1.0
  Ho  Ho1  1  0.369  0.869  0.500  1.0
  Ho  Ho2  1  0.631  0.131  0.500  1.0
  Cu  Cu3  1  0.640  0.329  0.311  1.0
  Cu  Cu4  1  0.017  0.329  0.689  1.0
  Cu  Cu5  1  0.360  0.671  0.689  1.0
  Cu  Cu6  1  0.983  0.671  0.311  1.0
  Sn  Sn7  1  0.216  0.216  0.000  1.0
  Sn  Sn8  1  0.784  0.784  0.000  1.0
  Sn  Sn9  1  0.703  0.500  0.203  1.0
  Sn  Sn10  1  0.297  0.500  0.797  1.0
[/CIF]
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The material structure described by Ho3Cu4Sn4 crystallizes in the orthorhombic Immm space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded to two equivalent Sn(1) and four equivalent Sn(2) atoms to form distorted edge-sharing HoSn6 octahedra. In the second Ho site, Ho(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 Ho(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 Ho(1), two equivalent Ho(2), and six equivalent Cu(1) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to two equivalent Ho(1), four equivalent Ho(2), two equivalent Cu(1), and one Sn(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ho3(CuSn)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.367
_cell_length_b   8.367
_cell_length_c   8.367
_cell_angle_alpha   149.358
_cell_angle_beta   131.220
_cell_angle_gamma   58.714
_symmetry_Int_Tables_number   1
_cell_volume   222.838
_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
  Ho  Ho0  1  0.000  0.000  0.000  1.0
  Ho  Ho1  1  0.369  0.869  0.500  1.0
  Ho  Ho2  1  0.631  0.131  0.500  1.0
  Cu  Cu3  1  0.640  0.329  0.311  1.0
  Cu  Cu4  1  0.017  0.329  0.689  1.0
  Cu  Cu5  1  0.360  0.671  0.689  1.0
  Cu  Cu6  1  0.983  0.671  0.311  1.0
  Sn  Sn7  1  0.216  0.216  0.000  1.0
  Sn  Sn8  1  0.784  0.784  0.000  1.0
  Sn  Sn9  1  0.703  0.500  0.203  1.0
  Sn  Sn10  1  0.297  0.500  0.797  1.0
[/CIF]
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