The material structure described by Er4CuGe8 crystallizes in the orthorhombic Pmm2 space group. There are four inequivalent Er sites. In the first Er site, Er(1) is bonded in a 10-coordinate geometry to two equivalent Ge(1), two equivalent Ge(3), two equivalent Ge(6), and four equivalent Ge(7) atoms. In the second Er site, Er(2) is bonded in a 10-coordinate geometry to two equivalent Ge(2), two equivalent Ge(4), two equivalent Ge(5), and four equivalent Ge(8) atoms. In the third Er site, Er(3) is bonded in a 14-coordinate geometry to four equivalent Cu(1), two equivalent Ge(1), two equivalent Ge(3), two equivalent Ge(8), and four equivalent Ge(5) atoms. In the fourth Er site, Er(4) is bonded in a 10-coordinate geometry to two equivalent Ge(2), two equivalent Ge(4), two equivalent Ge(7), and four equivalent Ge(6) atoms. Cu(1) is bonded in a 9-coordinate geometry to four equivalent Er(3), one Ge(5), two equivalent Ge(1), and two equivalent Ge(3) atoms. There are eight inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 10-coordinate geometry to two equivalent Er(1), two equivalent Er(3), two equivalent Cu(1), and four equivalent Ge(3) atoms. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to two equivalent Er(2), two equivalent Er(4), and four equivalent Ge(4) atoms. In the third Ge site, Ge(3) is bonded in a 4-coordinate geometry to two equivalent Er(1), two equivalent Er(3), two equivalent Cu(1), and four equivalent Ge(1) atoms. In the fourth Ge site, Ge(4) is bonded in a 8-coordinate geometry to two equivalent Er(2), two equivalent Er(4), and four equivalent Ge(2) atoms. In the fifth Ge site, Ge(5) is bonded in a 9-coordinate geometry to two equivalent Er(2), four equivalent Er(3), one Cu(1), and two equivalent Ge(8) atoms. In the sixth Ge site, Ge(6) is bonded in a 8-coordinate geometry to two equivalent Er(1), four equivalent Er(4), and two equivalent Ge(7) atoms. In the seventh Ge site, Ge(7) is bonded in a 8-coordinate geometry to two equivalent Er(4), four equivalent Er(1), and two equivalent Ge(6) atoms. In the eighth Ge site, Ge(8) is bonded in a 8-coordinate geometry to two equivalent Er(3), four equivalent Er(2), and two equivalent Ge(5) atoms. is represented by the CIF file [CIF]
data_Er4CuGe8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.947
_cell_length_b   4.044
_cell_length_c   16.356
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   261.114
_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
  Er  Er0  1  0.250  0.000  0.100  1.0
  Er  Er1  1  0.250  0.500  0.609  1.0
  Er  Er2  1  0.750  0.500  0.399  1.0
  Er  Er3  1  0.750  0.000  0.893  1.0
  Cu  Cu4  1  0.250  0.000  0.324  1.0
  Ge  Ge5  1  0.250  0.500  0.238  1.0
  Ge  Ge6  1  0.250  0.000  0.749  1.0
  Ge  Ge7  1  0.750  0.000  0.237  1.0
  Ge  Ge8  1  0.750  0.500  0.752  1.0
  Ge  Ge9  1  0.250  0.000  0.466  1.0
  Ge  Ge10  1  0.250  0.500  0.946  1.0
  Ge  Ge11  1  0.750  0.500  0.047  1.0
  Ge  Ge12  1  0.750  0.000  0.562  1.0
[/CIF]
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The material structure described by Er4CuGe8 crystallizes in the orthorhombic Pmm2 space group. There are four inequivalent Er sites. In the first Er site, Er(1) is bonded in a 10-coordinate geometry to two equivalent Ge(1), two equivalent Ge(3), two equivalent Ge(6), and four equivalent Ge(7) atoms. In the second Er site, Er(2) is bonded in a 10-coordinate geometry to two equivalent Ge(2), two equivalent Ge(4), two equivalent Ge(5), and four equivalent Ge(8) atoms. In the third Er site, Er(3) is bonded in a 14-coordinate geometry to four equivalent Cu(1), two equivalent Ge(1), two equivalent Ge(3), two equivalent Ge(8), and four equivalent Ge(5) atoms. In the fourth Er site, Er(4) is bonded in a 10-coordinate geometry to two equivalent Ge(2), two equivalent Ge(4), two equivalent Ge(7), and four equivalent Ge(6) atoms. Cu(1) is bonded in a 9-coordinate geometry to four equivalent Er(3), one Ge(5), two equivalent Ge(1), and two equivalent Ge(3) atoms. There are eight inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 10-coordinate geometry to two equivalent Er(1), two equivalent Er(3), two equivalent Cu(1), and four equivalent Ge(3) atoms. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to two equivalent Er(2), two equivalent Er(4), and four equivalent Ge(4) atoms. In the third Ge site, Ge(3) is bonded in a 4-coordinate geometry to two equivalent Er(1), two equivalent Er(3), two equivalent Cu(1), and four equivalent Ge(1) atoms. In the fourth Ge site, Ge(4) is bonded in a 8-coordinate geometry to two equivalent Er(2), two equivalent Er(4), and four equivalent Ge(2) atoms. In the fifth Ge site, Ge(5) is bonded in a 9-coordinate geometry to two equivalent Er(2), four equivalent Er(3), one Cu(1), and two equivalent Ge(8) atoms. In the sixth Ge site, Ge(6) is bonded in a 8-coordinate geometry to two equivalent Er(1), four equivalent Er(4), and two equivalent Ge(7) atoms. In the seventh Ge site, Ge(7) is bonded in a 8-coordinate geometry to two equivalent Er(4), four equivalent Er(1), and two equivalent Ge(6) atoms. In the eighth Ge site, Ge(8) is bonded in a 8-coordinate geometry to two equivalent Er(3), four equivalent Er(2), and two equivalent Ge(5) atoms. is represented by the CIF file [CIF]
data_Er4CuGe8
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.947
_cell_length_b   4.044
_cell_length_c   16.356
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   261.114
_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
  Er  Er0  1  0.250  0.000  0.100  1.0
  Er  Er1  1  0.250  0.500  0.609  1.0
  Er  Er2  1  0.750  0.500  0.399  1.0
  Er  Er3  1  0.750  0.000  0.893  1.0
  Cu  Cu4  1  0.250  0.000  0.324  1.0
  Ge  Ge5  1  0.250  0.500  0.238  1.0
  Ge  Ge6  1  0.250  0.000  0.749  1.0
  Ge  Ge7  1  0.750  0.000  0.237  1.0
  Ge  Ge8  1  0.750  0.500  0.752  1.0
  Ge  Ge9  1  0.250  0.000  0.466  1.0
  Ge  Ge10  1  0.250  0.500  0.946  1.0
  Ge  Ge11  1  0.750  0.500  0.047  1.0
  Ge  Ge12  1  0.750  0.000  0.562  1.0
[/CIF]
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