The material described by Ho3Cu4Si4 crystallizes in the monoclinic C2/m space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 12-coordinate geometry to six equivalent Cu(1), two equivalent Si(2), and four equivalent Si(1) atoms. In the second Ho site, Ho(2) is bonded to two equivalent Si(2) and four equivalent Si(1) atoms to form distorted edge-sharing HoSi6 octahedra. Cu(1) is bonded in a 8-coordinate geometry to three equivalent Ho(1), one Cu(1), one Si(1), and three equivalent Si(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Ho(2), four equivalent Ho(1), two equivalent Cu(1), and one Si(1) atom. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to one Ho(2), two equivalent Ho(1), and six equivalent Cu(1) atoms. is represented by the CIF file [CIF]
data_Ho3(CuSi)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.103
_cell_length_b   6.498
_cell_length_c   7.798
_cell_angle_alpha   114.635
_cell_angle_beta   105.292
_cell_angle_gamma   89.998
_symmetry_Int_Tables_number   1
_cell_volume   180.860
_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  0.870  0.870  0.739  1.0
  Ho  Ho1  1  0.130  0.130  0.261  1.0
  Ho  Ho2  1  0.000  0.500  0.000  1.0
  Cu  Cu3  1  0.330  0.521  0.662  1.0
  Cu  Cu4  1  0.671  0.859  0.339  1.0
  Cu  Cu5  1  0.329  0.141  0.661  1.0
  Cu  Cu6  1  0.670  0.479  0.338  1.0
  Si  Si7  1  0.500  0.815  0.000  1.0
  Si  Si8  1  0.500  0.185  1.000  1.0
  Si  Si9  1  0.783  0.284  0.568  1.0
  Si  Si10  1  0.217  0.716  0.432  1.0
[/CIF]
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The material described by Ho3Cu4Si4 crystallizes in the monoclinic C2/m space group. There are two inequivalent Ho sites. In the first Ho site, Ho(1) is bonded in a 12-coordinate geometry to six equivalent Cu(1), two equivalent Si(2), and four equivalent Si(1) atoms. In the second Ho site, Ho(2) is bonded to two equivalent Si(2) and four equivalent Si(1) atoms to form distorted edge-sharing HoSi6 octahedra. Cu(1) is bonded in a 8-coordinate geometry to three equivalent Ho(1), one Cu(1), one Si(1), and three equivalent Si(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Ho(2), four equivalent Ho(1), two equivalent Cu(1), and one Si(1) atom. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to one Ho(2), two equivalent Ho(1), and six equivalent Cu(1) atoms. is represented by the CIF file [CIF]
data_Ho3(CuSi)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.103
_cell_length_b   6.498
_cell_length_c   7.798
_cell_angle_alpha   114.635
_cell_angle_beta   105.292
_cell_angle_gamma   89.998
_symmetry_Int_Tables_number   1
_cell_volume   180.860
_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  0.870  0.870  0.739  1.0
  Ho  Ho1  1  0.130  0.130  0.261  1.0
  Ho  Ho2  1  0.000  0.500  0.000  1.0
  Cu  Cu3  1  0.330  0.521  0.662  1.0
  Cu  Cu4  1  0.671  0.859  0.339  1.0
  Cu  Cu5  1  0.329  0.141  0.661  1.0
  Cu  Cu6  1  0.670  0.479  0.338  1.0
  Si  Si7  1  0.500  0.815  0.000  1.0
  Si  Si8  1  0.500  0.185  1.000  1.0
  Si  Si9  1  0.783  0.284  0.568  1.0
  Si  Si10  1  0.217  0.716  0.432  1.0
[/CIF]
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