The material structure described by Er6Ge11 crystallizes in the monoclinic Cm space group. There are twelve inequivalent Er sites. In the first Er site, Er(1) is bonded in a 10-coordinate geometry to two equivalent Ge(4), four equivalent Ge(10), and four equivalent Ge(19) atoms. In the second Er site, Er(2) is bonded in a 10-coordinate geometry to two equivalent Ge(5), four equivalent Ge(11), and four equivalent Ge(20) atoms. In the third Er site, Er(3) is bonded in a 10-coordinate geometry to two equivalent Ge(22), four equivalent Ge(12), and four equivalent Ge(21) atoms. In the fourth Er site, Er(4) is bonded in a 10-coordinate geometry to two equivalent Ge(1), two equivalent Ge(21), four equivalent Ge(22), and four equivalent Ge(7) atoms. In the fifth Er site, Er(5) is bonded in a 8-coordinate geometry to two equivalent Ge(19), two equivalent Ge(2), and four equivalent Ge(8) atoms. In the sixth Er site, Er(6) is bonded in a 8-coordinate geometry to two equivalent Ge(20), two equivalent Ge(3), and four equivalent Ge(9) atoms. In the seventh Er site, Er(7) is bonded in a 10-coordinate geometry to two equivalent Ge(10), two equivalent Ge(13), two equivalent Ge(16), and four equivalent Ge(4) atoms. In the eighth Er site, Er(8) is bonded in a 10-coordinate geometry to two equivalent Ge(11), two equivalent Ge(14), two equivalent Ge(17), and four equivalent Ge(5) atoms. In the ninth Er site, Er(9) is bonded in a distorted q6 geometry to two equivalent Ge(12), two equivalent Ge(15), two equivalent Ge(18), and four equivalent Ge(6) atoms. In the tenth Er site, Er(10) is bonded in a distorted q6 geometry to two equivalent Ge(13), two equivalent Ge(16), two equivalent Ge(7), and four equivalent Ge(1) atoms. In the eleventh Er site, Er(11) is bonded in a 10-coordinate geometry to two equivalent Ge(14), two equivalent Ge(17), two equivalent Ge(8), and four equivalent Ge(2) atoms. In the twelfth Er site, Er(12) is bonded in a 10-coordinate geometry to two equivalent Ge(15), two equivalent Ge(18), two equivalent Ge(9), and four equivalent Ge(3) atoms. There are twenty-two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 8-coordinate geometry to two equivalent Er(4), four equivalent Er(10), and two equivalent Ge(7) atoms. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to two equivalent Er(5), four equivalent Er(11), and two equivalent Ge(8) atoms. In the third Ge site, Ge(3) is bonded in a 8-coordinate geometry to two equivalent Er(6), four equivalent Er(12), and two equivalent Ge(9) atoms. In the fourth Ge site, Ge(4) is bonded in a 8-coordinate geometry to two equivalent Er(1), four equivalent Er(7), and two equivalent Ge(10) atoms. In the fifth Ge site, Ge(5) is bonded in a 8-coordinate geometry to two equivalent Er(2), four equivalent Er(8), and two equivalent Ge(11) atoms. In the sixth Ge site, Ge(6) is bonded in a 4-coordinate geometry to four equivalent Er(9) and two equivalent Ge(12) atoms. In the seventh Ge site, Ge(7) is bonded in a 9-coordinate geometry to two equivalent Er(10), four equivalent Er(4), one Ge(22), and two equivalent Ge(1) atoms. In the eighth Ge site, Ge(8) is bonded in a 8-coordinate geometry to two equivalent Er(11), four equivalent Er(5), and two equivalent Ge(2) atoms. In the ninth Ge site, Ge(9) is bonded in a 8-coordinate geometry to two equivalent Er(12), four equivalent Er(6), and two equivalent Ge(3) atoms. In the tenth Ge site, Ge(10) is bonded in a 9-coordinate geometry to two equivalent Er(7), four equivalent Er(1), one Ge(19), and two equivalent Ge(4) atoms. In the eleventh Ge site, Ge(11) is bonded in a 9-coordinate geometry to two equivalent Er(8), four equivalent Er(2), one Ge(20), and two equivalent Ge(5) atoms. In the twelfth Ge site, Ge(12) is bonded in a 9-coordinate geometry to two equivalent Er(9), four equivalent Er(3), one Ge(21), and two equivalent Ge(6) atoms. In the thirteenth Ge site, Ge(13) is bonded in a 8-coordinate geometry to two equivalent Er(10), two equivalent Er(7), and four equivalent Ge(16) atoms. In the fourteenth Ge site, Ge(14) is bonded in a 8-coordinate geometry to two equivalent Er(11), two equivalent Er(8), and four equivalent Ge(17) atoms. In the fifteenth Ge site, Ge(15) is bonded in a 8-coordinate geometry to two equivalent Er(12), two equivalent Er(9), and four equivalent Ge(18) atoms. In the sixteenth Ge site, Ge(16) is bonded in a 8-coordinate geometry to two equivalent Er(10), two equivalent Er(7), and four equivalent Ge(13) atoms. In the seventeenth Ge site, Ge(17) is bonded in a 8-coordinate geometry to two equivalent Er(11), two equivalent Er(8), and four equivalent Ge(14) atoms. In the eighteenth Ge site, Ge(18) is bonded in a 8-coordinate geometry to two equivalent Er(12), two equivalent Er(9), and four equivalent Ge(15) atoms. In the nineteenth Ge site, Ge(19) is bonded in a 7-coordinate geometry to two equivalent Er(5), four equivalent Er(1), and one Ge(10) atom. In the twentieth Ge site, Ge(20) is bonded in a 7-coordinate geometry to two equivalent Er(6), four equivalent Er(2), and one Ge(11) atom. In the twenty-first Ge site, Ge(21) is bonded in a 9-coordinate geometry to two equivalent Er(4), four equivalent Er(3), one Ge(12), and two equivalent Ge(22) atoms. In the twenty-second Ge site, Ge(22) is bonded in a 9-coordinate geometry to two equivalent Er(3), four equivalent Er(4), one Ge(7), and two equivalent Ge(21) atoms. is represented by the CIF file [CIF]
data_Er6Ge11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.039
_cell_length_b   4.108
_cell_length_c   43.684
_cell_angle_alpha   92.695
_cell_angle_beta   90.123
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   723.974
_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  0.255  0.646  0.293  1.0
  Er  Er1  1  0.255  0.313  0.626  1.0
  Er  Er2  1  0.278  0.980  0.959  1.0
  Er  Er3  1  0.778  0.020  0.041  1.0
  Er  Er4  1  0.738  0.688  0.376  1.0
  Er  Er5  1  0.738  0.355  0.709  1.0
  Er  Er6  1  0.738  0.609  0.219  1.0
  Er  Er7  1  0.738  0.276  0.552  1.0
  Er  Er8  1  0.742  0.942  0.884  1.0
  Er  Er9  1  0.241  0.058  0.116  1.0
  Er  Er10  1  0.243  0.724  0.448  1.0
  Er  Er11  1  0.244  0.391  0.781  1.0
  Ge  Ge12  1  0.741  0.554  0.108  1.0
  Ge  Ge13  1  0.743  0.217  0.434  1.0
  Ge  Ge14  1  0.745  0.883  0.766  1.0
  Ge  Ge15  1  0.239  0.116  0.233  1.0
  Ge  Ge16  1  0.238  0.783  0.565  1.0
  Ge  Ge17  1  0.241  0.446  0.892  1.0
  Ge  Ge18  1  0.248  0.534  0.069  1.0
  Ge  Ge19  1  0.239  0.197  0.393  1.0
  Ge  Ge20  1  0.241  0.863  0.726  1.0
  Ge  Ge21  1  0.749  0.136  0.271  1.0
  Ge  Ge22  1  0.746  0.802  0.604  1.0
  Ge  Ge23  1  0.749  0.465  0.931  1.0
  Ge  Ge24  1  0.244  0.584  0.167  1.0
  Ge  Ge25  1  0.236  0.250  0.500  1.0
  Ge  Ge26  1  0.242  0.917  0.833  1.0
  Ge  Ge27  1  0.745  0.083  0.167  1.0
  Ge  Ge28  1  0.750  0.750  0.500  1.0
  Ge  Ge29  1  0.750  0.417  0.833  1.0
  Ge  Ge30  1  0.864  0.164  0.328  1.0
  Ge  Ge31  1  0.866  0.831  0.661  1.0
  Ge  Ge32  1  0.803  0.493  0.986  1.0
  Ge  Ge33  1  0.304  0.507  0.014  1.0
[/CIF]
.
The material structure described by Er6Ge11 crystallizes in the monoclinic Cm space group. There are twelve inequivalent Er sites. In the first Er site, Er(1) is bonded in a 10-coordinate geometry to two equivalent Ge(4), four equivalent Ge(10), and four equivalent Ge(19) atoms. In the second Er site, Er(2) is bonded in a 10-coordinate geometry to two equivalent Ge(5), four equivalent Ge(11), and four equivalent Ge(20) atoms. In the third Er site, Er(3) is bonded in a 10-coordinate geometry to two equivalent Ge(22), four equivalent Ge(12), and four equivalent Ge(21) atoms. In the fourth Er site, Er(4) is bonded in a 10-coordinate geometry to two equivalent Ge(1), two equivalent Ge(21), four equivalent Ge(22), and four equivalent Ge(7) atoms. In the fifth Er site, Er(5) is bonded in a 8-coordinate geometry to two equivalent Ge(19), two equivalent Ge(2), and four equivalent Ge(8) atoms. In the sixth Er site, Er(6) is bonded in a 8-coordinate geometry to two equivalent Ge(20), two equivalent Ge(3), and four equivalent Ge(9) atoms. In the seventh Er site, Er(7) is bonded in a 10-coordinate geometry to two equivalent Ge(10), two equivalent Ge(13), two equivalent Ge(16), and four equivalent Ge(4) atoms. In the eighth Er site, Er(8) is bonded in a 10-coordinate geometry to two equivalent Ge(11), two equivalent Ge(14), two equivalent Ge(17), and four equivalent Ge(5) atoms. In the ninth Er site, Er(9) is bonded in a distorted q6 geometry to two equivalent Ge(12), two equivalent Ge(15), two equivalent Ge(18), and four equivalent Ge(6) atoms. In the tenth Er site, Er(10) is bonded in a distorted q6 geometry to two equivalent Ge(13), two equivalent Ge(16), two equivalent Ge(7), and four equivalent Ge(1) atoms. In the eleventh Er site, Er(11) is bonded in a 10-coordinate geometry to two equivalent Ge(14), two equivalent Ge(17), two equivalent Ge(8), and four equivalent Ge(2) atoms. In the twelfth Er site, Er(12) is bonded in a 10-coordinate geometry to two equivalent Ge(15), two equivalent Ge(18), two equivalent Ge(9), and four equivalent Ge(3) atoms. There are twenty-two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 8-coordinate geometry to two equivalent Er(4), four equivalent Er(10), and two equivalent Ge(7) atoms. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to two equivalent Er(5), four equivalent Er(11), and two equivalent Ge(8) atoms. In the third Ge site, Ge(3) is bonded in a 8-coordinate geometry to two equivalent Er(6), four equivalent Er(12), and two equivalent Ge(9) atoms. In the fourth Ge site, Ge(4) is bonded in a 8-coordinate geometry to two equivalent Er(1), four equivalent Er(7), and two equivalent Ge(10) atoms. In the fifth Ge site, Ge(5) is bonded in a 8-coordinate geometry to two equivalent Er(2), four equivalent Er(8), and two equivalent Ge(11) atoms. In the sixth Ge site, Ge(6) is bonded in a 4-coordinate geometry to four equivalent Er(9) and two equivalent Ge(12) atoms. In the seventh Ge site, Ge(7) is bonded in a 9-coordinate geometry to two equivalent Er(10), four equivalent Er(4), one Ge(22), and two equivalent Ge(1) atoms. In the eighth Ge site, Ge(8) is bonded in a 8-coordinate geometry to two equivalent Er(11), four equivalent Er(5), and two equivalent Ge(2) atoms. In the ninth Ge site, Ge(9) is bonded in a 8-coordinate geometry to two equivalent Er(12), four equivalent Er(6), and two equivalent Ge(3) atoms. In the tenth Ge site, Ge(10) is bonded in a 9-coordinate geometry to two equivalent Er(7), four equivalent Er(1), one Ge(19), and two equivalent Ge(4) atoms. In the eleventh Ge site, Ge(11) is bonded in a 9-coordinate geometry to two equivalent Er(8), four equivalent Er(2), one Ge(20), and two equivalent Ge(5) atoms. In the twelfth Ge site, Ge(12) is bonded in a 9-coordinate geometry to two equivalent Er(9), four equivalent Er(3), one Ge(21), and two equivalent Ge(6) atoms. In the thirteenth Ge site, Ge(13) is bonded in a 8-coordinate geometry to two equivalent Er(10), two equivalent Er(7), and four equivalent Ge(16) atoms. In the fourteenth Ge site, Ge(14) is bonded in a 8-coordinate geometry to two equivalent Er(11), two equivalent Er(8), and four equivalent Ge(17) atoms. In the fifteenth Ge site, Ge(15) is bonded in a 8-coordinate geometry to two equivalent Er(12), two equivalent Er(9), and four equivalent Ge(18) atoms. In the sixteenth Ge site, Ge(16) is bonded in a 8-coordinate geometry to two equivalent Er(10), two equivalent Er(7), and four equivalent Ge(13) atoms. In the seventeenth Ge site, Ge(17) is bonded in a 8-coordinate geometry to two equivalent Er(11), two equivalent Er(8), and four equivalent Ge(14) atoms. In the eighteenth Ge site, Ge(18) is bonded in a 8-coordinate geometry to two equivalent Er(12), two equivalent Er(9), and four equivalent Ge(15) atoms. In the nineteenth Ge site, Ge(19) is bonded in a 7-coordinate geometry to two equivalent Er(5), four equivalent Er(1), and one Ge(10) atom. In the twentieth Ge site, Ge(20) is bonded in a 7-coordinate geometry to two equivalent Er(6), four equivalent Er(2), and one Ge(11) atom. In the twenty-first Ge site, Ge(21) is bonded in a 9-coordinate geometry to two equivalent Er(4), four equivalent Er(3), one Ge(12), and two equivalent Ge(22) atoms. In the twenty-second Ge site, Ge(22) is bonded in a 9-coordinate geometry to two equivalent Er(3), four equivalent Er(4), one Ge(7), and two equivalent Ge(21) atoms. is represented by the CIF file [CIF]
data_Er6Ge11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.039
_cell_length_b   4.108
_cell_length_c   43.684
_cell_angle_alpha   92.695
_cell_angle_beta   90.123
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   723.974
_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  0.255  0.646  0.293  1.0
  Er  Er1  1  0.255  0.313  0.626  1.0
  Er  Er2  1  0.278  0.980  0.959  1.0
  Er  Er3  1  0.778  0.020  0.041  1.0
  Er  Er4  1  0.738  0.688  0.376  1.0
  Er  Er5  1  0.738  0.355  0.709  1.0
  Er  Er6  1  0.738  0.609  0.219  1.0
  Er  Er7  1  0.738  0.276  0.552  1.0
  Er  Er8  1  0.742  0.942  0.884  1.0
  Er  Er9  1  0.241  0.058  0.116  1.0
  Er  Er10  1  0.243  0.724  0.448  1.0
  Er  Er11  1  0.244  0.391  0.781  1.0
  Ge  Ge12  1  0.741  0.554  0.108  1.0
  Ge  Ge13  1  0.743  0.217  0.434  1.0
  Ge  Ge14  1  0.745  0.883  0.766  1.0
  Ge  Ge15  1  0.239  0.116  0.233  1.0
  Ge  Ge16  1  0.238  0.783  0.565  1.0
  Ge  Ge17  1  0.241  0.446  0.892  1.0
  Ge  Ge18  1  0.248  0.534  0.069  1.0
  Ge  Ge19  1  0.239  0.197  0.393  1.0
  Ge  Ge20  1  0.241  0.863  0.726  1.0
  Ge  Ge21  1  0.749  0.136  0.271  1.0
  Ge  Ge22  1  0.746  0.802  0.604  1.0
  Ge  Ge23  1  0.749  0.465  0.931  1.0
  Ge  Ge24  1  0.244  0.584  0.167  1.0
  Ge  Ge25  1  0.236  0.250  0.500  1.0
  Ge  Ge26  1  0.242  0.917  0.833  1.0
  Ge  Ge27  1  0.745  0.083  0.167  1.0
  Ge  Ge28  1  0.750  0.750  0.500  1.0
  Ge  Ge29  1  0.750  0.417  0.833  1.0
  Ge  Ge30  1  0.864  0.164  0.328  1.0
  Ge  Ge31  1  0.866  0.831  0.661  1.0
  Ge  Ge32  1  0.803  0.493  0.986  1.0
  Ge  Ge33  1  0.304  0.507  0.014  1.0
[/CIF]
.