The crystal structure described by Ho2Al3Ge4 crystallizes in the orthorhombic Cmce space group. Ho(1) is bonded in a 8-coordinate geometry to four equivalent Ge(1) and four equivalent Ge(2) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent Ge(2) and four equivalent Ge(1) atoms to form distorted corner-sharing AlGe6 octahedra. The corner-sharing octahedral tilt angles are 32°. In the second Al site, Al(2) is bonded in a 5-coordinate geometry to one Ge(1) and four equivalent Ge(2) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 7-coordinate geometry to four equivalent Ho(1), one Al(2), and two equivalent Al(1) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to four equivalent Ho(1), one Al(1), and four equivalent Al(2) atoms. is represented by the CIF card [CIF]
data_Ho2Al3Ge4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.004
_cell_length_b   8.004
_cell_length_c   7.882
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   135.844
_symmetry_Int_Tables_number   1
_cell_volume   351.821
_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
  Ho  Ho0  1  0.114  0.886  0.418  1.0
  Ho  Ho1  1  0.886  0.114  0.582  1.0
  Ho  Ho2  1  0.386  0.614  0.918  1.0
  Ho  Ho3  1  0.614  0.386  0.082  1.0
  Al  Al4  1  0.000  0.000  0.000  1.0
  Al  Al5  1  0.500  0.500  0.500  1.0
  Al  Al6  1  0.032  0.468  0.250  1.0
  Al  Al7  1  0.468  0.032  0.750  1.0
  Al  Al8  1  0.968  0.532  0.750  1.0
  Al  Al9  1  0.532  0.968  0.250  1.0
  Ge  Ge10  1  0.203  0.297  0.250  1.0
  Ge  Ge11  1  0.297  0.203  0.750  1.0
  Ge  Ge12  1  0.797  0.703  0.750  1.0
  Ge  Ge13  1  0.703  0.797  0.250  1.0
  Ge  Ge14  1  0.184  0.816  0.051  1.0
  Ge  Ge15  1  0.816  0.184  0.949  1.0
  Ge  Ge16  1  0.316  0.684  0.551  1.0
  Ge  Ge17  1  0.684  0.316  0.449  1.0
[/CIF]
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The crystal structure described by Ho2Al3Ge4 crystallizes in the orthorhombic Cmce space group. Ho(1) is bonded in a 8-coordinate geometry to four equivalent Ge(1) and four equivalent Ge(2) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to two equivalent Ge(2) and four equivalent Ge(1) atoms to form distorted corner-sharing AlGe6 octahedra. The corner-sharing octahedral tilt angles are 32°. In the second Al site, Al(2) is bonded in a 5-coordinate geometry to one Ge(1) and four equivalent Ge(2) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 7-coordinate geometry to four equivalent Ho(1), one Al(2), and two equivalent Al(1) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to four equivalent Ho(1), one Al(1), and four equivalent Al(2) atoms. is represented by the CIF card [CIF]
data_Ho2Al3Ge4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.004
_cell_length_b   8.004
_cell_length_c   7.882
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   135.844
_symmetry_Int_Tables_number   1
_cell_volume   351.821
_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
  Ho  Ho0  1  0.114  0.886  0.418  1.0
  Ho  Ho1  1  0.886  0.114  0.582  1.0
  Ho  Ho2  1  0.386  0.614  0.918  1.0
  Ho  Ho3  1  0.614  0.386  0.082  1.0
  Al  Al4  1  0.000  0.000  0.000  1.0
  Al  Al5  1  0.500  0.500  0.500  1.0
  Al  Al6  1  0.032  0.468  0.250  1.0
  Al  Al7  1  0.468  0.032  0.750  1.0
  Al  Al8  1  0.968  0.532  0.750  1.0
  Al  Al9  1  0.532  0.968  0.250  1.0
  Ge  Ge10  1  0.203  0.297  0.250  1.0
  Ge  Ge11  1  0.297  0.203  0.750  1.0
  Ge  Ge12  1  0.797  0.703  0.750  1.0
  Ge  Ge13  1  0.703  0.797  0.250  1.0
  Ge  Ge14  1  0.184  0.816  0.051  1.0
  Ge  Ge15  1  0.816  0.184  0.949  1.0
  Ge  Ge16  1  0.316  0.684  0.551  1.0
  Ge  Ge17  1  0.684  0.316  0.449  1.0
[/CIF]
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