The material structure described by Er6Al2Ge7 crystallizes in the monoclinic C2/m space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 8-coordinate geometry to two equivalent Ge(2), three equivalent Ge(4), and four equivalent Ge(1) atoms. In the second Er site, Er(2) is bonded in a 8-coordinate geometry to two equivalent Al(1), one Ge(3), one Ge(4), two equivalent Ge(1), and three equivalent Ge(2) atoms. In the third Er site, Er(3) is bonded in a 8-coordinate geometry to two equivalent Al(1), one Ge(2), and five equivalent Ge(3) atoms. Al(1) is bonded in a 4-coordinate geometry to two equivalent Er(2), two equivalent Er(3), two equivalent Ge(2), and two equivalent Ge(3) atoms. There are four 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(4) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to one Er(3), two equivalent Er(1), three equivalent Er(2), two equivalent Al(1), and one Ge(1) atom. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to one Er(2), five equivalent Er(3), two equivalent Al(1), and one Ge(3) atom. In the fourth Ge site, Ge(4) is bonded to two equivalent Er(2), six equivalent Er(1), and four equivalent Ge(1) atoms to form a mixture of distorted edge and face-sharing GeEr8Ge4 cuboctahedra. is represented by the CIF card [CIF]
data_Er6Al2Ge7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.615
_cell_length_b   5.615
_cell_length_c   14.992
_cell_angle_alpha   89.225
_cell_angle_beta   89.225
_cell_angle_gamma   42.751
_symmetry_Int_Tables_number   1
_cell_volume   320.814
_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  0.687  0.687  0.907  1.0
  Er  Er1  1  0.026  0.026  0.239  1.0
  Er  Er2  1  0.359  0.359  0.572  1.0
  Er  Er3  1  0.974  0.974  0.761  1.0
  Er  Er4  1  0.313  0.313  0.093  1.0
  Er  Er5  1  0.641  0.641  0.428  1.0
  Al  Al6  1  0.334  0.334  0.334  1.0
  Al  Al7  1  0.666  0.666  0.666  1.0
  Ge  Ge8  1  0.400  0.400  0.900  1.0
  Ge  Ge9  1  0.740  0.740  0.239  1.0
  Ge  Ge10  1  0.071  0.071  0.571  1.0
  Ge  Ge11  1  0.260  0.260  0.761  1.0
  Ge  Ge12  1  0.600  0.600  0.100  1.0
  Ge  Ge13  1  0.929  0.929  0.429  1.0
  Ge  Ge14  1  0.000  0.000  0.000  1.0
[/CIF]
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The material structure described by Er6Al2Ge7 crystallizes in the monoclinic C2/m space group. There are three inequivalent Er sites. In the first Er site, Er(1) is bonded in a 8-coordinate geometry to two equivalent Ge(2), three equivalent Ge(4), and four equivalent Ge(1) atoms. In the second Er site, Er(2) is bonded in a 8-coordinate geometry to two equivalent Al(1), one Ge(3), one Ge(4), two equivalent Ge(1), and three equivalent Ge(2) atoms. In the third Er site, Er(3) is bonded in a 8-coordinate geometry to two equivalent Al(1), one Ge(2), and five equivalent Ge(3) atoms. Al(1) is bonded in a 4-coordinate geometry to two equivalent Er(2), two equivalent Er(3), two equivalent Ge(2), and two equivalent Ge(3) atoms. There are four 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(4) atoms. In the second Ge site, Ge(2) is bonded in a 9-coordinate geometry to one Er(3), two equivalent Er(1), three equivalent Er(2), two equivalent Al(1), and one Ge(1) atom. In the third Ge site, Ge(3) is bonded in a 9-coordinate geometry to one Er(2), five equivalent Er(3), two equivalent Al(1), and one Ge(3) atom. In the fourth Ge site, Ge(4) is bonded to two equivalent Er(2), six equivalent Er(1), and four equivalent Ge(1) atoms to form a mixture of distorted edge and face-sharing GeEr8Ge4 cuboctahedra. is represented by the CIF card [CIF]
data_Er6Al2Ge7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.615
_cell_length_b   5.615
_cell_length_c   14.992
_cell_angle_alpha   89.225
_cell_angle_beta   89.225
_cell_angle_gamma   42.751
_symmetry_Int_Tables_number   1
_cell_volume   320.814
_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  0.687  0.687  0.907  1.0
  Er  Er1  1  0.026  0.026  0.239  1.0
  Er  Er2  1  0.359  0.359  0.572  1.0
  Er  Er3  1  0.974  0.974  0.761  1.0
  Er  Er4  1  0.313  0.313  0.093  1.0
  Er  Er5  1  0.641  0.641  0.428  1.0
  Al  Al6  1  0.334  0.334  0.334  1.0
  Al  Al7  1  0.666  0.666  0.666  1.0
  Ge  Ge8  1  0.400  0.400  0.900  1.0
  Ge  Ge9  1  0.740  0.740  0.239  1.0
  Ge  Ge10  1  0.071  0.071  0.571  1.0
  Ge  Ge11  1  0.260  0.260  0.761  1.0
  Ge  Ge12  1  0.600  0.600  0.100  1.0
  Ge  Ge13  1  0.929  0.929  0.429  1.0
  Ge  Ge14  1  0.000  0.000  0.000  1.0
[/CIF]
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