The material described by Er3Ge4 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 8-coordinate geometry to two equivalent Ge(2), two equivalent Ge(3), and four equivalent Ge(1) atoms. In the second Er site, Er(2) is bonded in a 7-coordinate geometry to three equivalent Ge(2) and four equivalent Ge(1) atoms. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to two equivalent Er(2), four equivalent Er(1), one Ge(2), and two equivalent Ge(3) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to three equivalent Er(2), four equivalent Er(1), and two equivalent Ge(1) atoms. In the third Ge site, Ge(3) is bonded in a 4-coordinate geometry to four equivalent Er(1) and four equivalent Ge(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er3Ge4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.015
_cell_length_b   5.637
_cell_length_c   14.111
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   110.863
_symmetry_Int_Tables_number   1
_cell_volume   298.459
_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
  Er  Er0  1  0.331  0.662  0.597  1.0
  Er  Er1  1  0.669  0.338  0.403  1.0
  Er  Er2  1  0.669  0.338  0.097  1.0
  Er  Er3  1  0.331  0.662  0.903  1.0
  Er  Er4  1  0.953  0.905  0.250  1.0
  Er  Er5  1  0.047  0.095  0.750  1.0
  Ge  Ge6  1  0.379  0.758  0.391  1.0
  Ge  Ge7  1  0.621  0.242  0.609  1.0
  Ge  Ge8  1  0.621  0.242  0.891  1.0
  Ge  Ge9  1  0.379  0.758  0.109  1.0
  Ge  Ge10  1  0.224  0.447  0.250  1.0
  Ge  Ge11  1  0.776  0.553  0.750  1.0
  Ge  Ge12  1  0.000  0.000  0.000  1.0
  Ge  Ge13  1  0.000  0.000  0.500  1.0
[/CIF]
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The material described by Er3Ge4 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 8-coordinate geometry to two equivalent Ge(2), two equivalent Ge(3), and four equivalent Ge(1) atoms. In the second Er site, Er(2) is bonded in a 7-coordinate geometry to three equivalent Ge(2) and four equivalent Ge(1) atoms. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to two equivalent Er(2), four equivalent Er(1), one Ge(2), and two equivalent Ge(3) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to three equivalent Er(2), four equivalent Er(1), and two equivalent Ge(1) atoms. In the third Ge site, Ge(3) is bonded in a 4-coordinate geometry to four equivalent Er(1) and four equivalent Ge(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Er3Ge4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.015
_cell_length_b   5.637
_cell_length_c   14.111
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   110.863
_symmetry_Int_Tables_number   1
_cell_volume   298.459
_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
  Er  Er0  1  0.331  0.662  0.597  1.0
  Er  Er1  1  0.669  0.338  0.403  1.0
  Er  Er2  1  0.669  0.338  0.097  1.0
  Er  Er3  1  0.331  0.662  0.903  1.0
  Er  Er4  1  0.953  0.905  0.250  1.0
  Er  Er5  1  0.047  0.095  0.750  1.0
  Ge  Ge6  1  0.379  0.758  0.391  1.0
  Ge  Ge7  1  0.621  0.242  0.609  1.0
  Ge  Ge8  1  0.621  0.242  0.891  1.0
  Ge  Ge9  1  0.379  0.758  0.109  1.0
  Ge  Ge10  1  0.224  0.447  0.250  1.0
  Ge  Ge11  1  0.776  0.553  0.750  1.0
  Ge  Ge12  1  0.000  0.000  0.000  1.0
  Ge  Ge13  1  0.000  0.000  0.500  1.0
[/CIF]
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