The structure described by Sr14Al8Ge3 crystallizes in the trigonal R-3 space group. There are seven inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 5-coordinate geometry to one Al(1), one Al(3), and three equivalent Ge(1) atoms. In the second Sr site, Sr(2) is bonded in a 5-coordinate geometry to one Al(1), one Al(3), one Al(4), and two equivalent Ge(1) atoms. In the third Sr site, Sr(3) is bonded to one Al(1), two equivalent Al(2), and one Ge(1) atom to form distorted SrAl3Ge tetrahedra that share  a cornercorner with one Sr(7)Ge6 octahedra and corners with two equivalent Sr(3)Al3Ge tetrahedra. The corner-sharing octahedral tilt angles are 59°. In the fourth Sr site, Sr(4) is bonded in a 6-coordinate geometry to one Al(1), one Al(4), three equivalent Al(2), and one Ge(1) atom. In the fifth Sr site, Sr(5) is bonded in a 6-coordinate geometry to three equivalent Al(2) and three equivalent Ge(1) atoms. In the sixth Sr site, Sr(6) is bonded in a 6-coordinate geometry to six equivalent Al(1) atoms. In the seventh Sr site, Sr(7) is bonded to six equivalent Ge(1) atoms to form corner-sharing SrGe6 octahedra. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded in a 8-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Sr(6), one Al(3), and two equivalent Al(1) atoms. In the second Al site, Al(2) is bonded in a 9-coordinate geometry to one Sr(5), two equivalent Sr(3), three equivalent Sr(4), one Al(4), and two equivalent Al(2) atoms. In the third Al site, Al(3) is bonded in a 9-coordinate geometry to three equivalent Sr(1), three equivalent Sr(2), and three equivalent Al(1) atoms. In the fourth Al site, Al(4) is bonded in a 9-coordinate geometry to three equivalent Sr(2), three equivalent Sr(4), and three equivalent Al(2) atoms. Ge(1) is bonded in a 9-coordinate geometry to one Sr(3), one Sr(4), one Sr(5), one Sr(7), two equivalent Sr(2), and three equivalent Sr(1) atoms. is represented by the CIF card [CIF]
data_Sr14Al8Ge3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   15.064
_cell_length_b   15.064
_cell_length_c   15.064
_cell_angle_alpha   46.954
_cell_angle_beta   46.954
_cell_angle_gamma   46.954
_symmetry_Int_Tables_number   1
_cell_volume   1668.652
_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
  Sr  Sr0  1  0.693  0.206  0.192  1.0
  Sr  Sr1  1  0.927  0.587  0.617  1.0
  Sr  Sr2  1  0.794  0.147  0.416  1.0
  Sr  Sr3  1  0.192  0.693  0.206  1.0
  Sr  Sr4  1  0.413  0.383  0.073  1.0
  Sr  Sr5  1  0.147  0.416  0.794  1.0
  Sr  Sr6  1  0.383  0.073  0.413  1.0
  Sr  Sr7  1  0.794  0.808  0.307  1.0
  Sr  Sr8  1  0.416  0.794  0.147  1.0
  Sr  Sr9  1  0.507  0.946  0.194  1.0
  Sr  Sr10  1  0.806  0.493  0.054  1.0
  Sr  Sr11  1  0.909  0.909  0.909  1.0
  Sr  Sr12  1  0.091  0.091  0.091  1.0
  Sr  Sr13  1  0.853  0.584  0.206  1.0
  Sr  Sr14  1  0.808  0.307  0.794  1.0
  Sr  Sr15  1  0.206  0.853  0.584  1.0
  Sr  Sr16  1  0.584  0.206  0.853  1.0
  Sr  Sr17  1  0.054  0.806  0.493  1.0
  Sr  Sr18  1  0.493  0.054  0.806  1.0
  Sr  Sr19  1  0.194  0.507  0.946  1.0
  Sr  Sr20  1  0.073  0.413  0.383  1.0
  Sr  Sr21  1  0.500  0.500  0.500  1.0
  Sr  Sr22  1  0.617  0.927  0.587  1.0
  Sr  Sr23  1  0.587  0.617  0.927  1.0
  Sr  Sr24  1  0.000  0.000  0.000  1.0
  Sr  Sr25  1  0.946  0.194  0.507  1.0
  Sr  Sr26  1  0.307  0.794  0.808  1.0
  Sr  Sr27  1  0.206  0.192  0.693  1.0
  Al  Al28  1  0.528  0.733  0.492  1.0
  Al  Al29  1  0.031  0.290  0.182  1.0
  Al  Al30  1  0.508  0.472  0.267  1.0
  Al  Al31  1  0.290  0.182  0.031  1.0
  Al  Al32  1  0.267  0.508  0.472  1.0
  Al  Al33  1  0.640  0.640  0.640  1.0
  Al  Al34  1  0.733  0.492  0.528  1.0
  Al  Al35  1  0.182  0.031  0.290  1.0
  Al  Al36  1  0.360  0.360  0.360  1.0
  Al  Al37  1  0.776  0.776  0.776  1.0
  Al  Al38  1  0.472  0.267  0.508  1.0
  Al  Al39  1  0.818  0.969  0.710  1.0
  Al  Al40  1  0.969  0.710  0.818  1.0
  Al  Al41  1  0.492  0.528  0.733  1.0
  Al  Al42  1  0.710  0.818  0.969  1.0
  Al  Al43  1  0.224  0.224  0.224  1.0
  Ge  Ge44  1  0.670  0.096  0.082  1.0
  Ge  Ge45  1  0.082  0.670  0.096  1.0
  Ge  Ge46  1  0.330  0.904  0.918  1.0
  Ge  Ge47  1  0.904  0.918  0.330  1.0
  Ge  Ge48  1  0.918  0.330  0.904  1.0
  Ge  Ge49  1  0.096  0.082  0.670  1.0
[/CIF]
.
The structure described by Sr14Al8Ge3 crystallizes in the trigonal R-3 space group. There are seven inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 5-coordinate geometry to one Al(1), one Al(3), and three equivalent Ge(1) atoms. In the second Sr site, Sr(2) is bonded in a 5-coordinate geometry to one Al(1), one Al(3), one Al(4), and two equivalent Ge(1) atoms. In the third Sr site, Sr(3) is bonded to one Al(1), two equivalent Al(2), and one Ge(1) atom to form distorted SrAl3Ge tetrahedra that share  a cornercorner with one Sr(7)Ge6 octahedra and corners with two equivalent Sr(3)Al3Ge tetrahedra. The corner-sharing octahedral tilt angles are 59°. In the fourth Sr site, Sr(4) is bonded in a 6-coordinate geometry to one Al(1), one Al(4), three equivalent Al(2), and one Ge(1) atom. In the fifth Sr site, Sr(5) is bonded in a 6-coordinate geometry to three equivalent Al(2) and three equivalent Ge(1) atoms. In the sixth Sr site, Sr(6) is bonded in a 6-coordinate geometry to six equivalent Al(1) atoms. In the seventh Sr site, Sr(7) is bonded to six equivalent Ge(1) atoms to form corner-sharing SrGe6 octahedra. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded in a 8-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(4), one Sr(6), one Al(3), and two equivalent Al(1) atoms. In the second Al site, Al(2) is bonded in a 9-coordinate geometry to one Sr(5), two equivalent Sr(3), three equivalent Sr(4), one Al(4), and two equivalent Al(2) atoms. In the third Al site, Al(3) is bonded in a 9-coordinate geometry to three equivalent Sr(1), three equivalent Sr(2), and three equivalent Al(1) atoms. In the fourth Al site, Al(4) is bonded in a 9-coordinate geometry to three equivalent Sr(2), three equivalent Sr(4), and three equivalent Al(2) atoms. Ge(1) is bonded in a 9-coordinate geometry to one Sr(3), one Sr(4), one Sr(5), one Sr(7), two equivalent Sr(2), and three equivalent Sr(1) atoms. is represented by the CIF card [CIF]
data_Sr14Al8Ge3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   15.064
_cell_length_b   15.064
_cell_length_c   15.064
_cell_angle_alpha   46.954
_cell_angle_beta   46.954
_cell_angle_gamma   46.954
_symmetry_Int_Tables_number   1
_cell_volume   1668.652
_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
  Sr  Sr0  1  0.693  0.206  0.192  1.0
  Sr  Sr1  1  0.927  0.587  0.617  1.0
  Sr  Sr2  1  0.794  0.147  0.416  1.0
  Sr  Sr3  1  0.192  0.693  0.206  1.0
  Sr  Sr4  1  0.413  0.383  0.073  1.0
  Sr  Sr5  1  0.147  0.416  0.794  1.0
  Sr  Sr6  1  0.383  0.073  0.413  1.0
  Sr  Sr7  1  0.794  0.808  0.307  1.0
  Sr  Sr8  1  0.416  0.794  0.147  1.0
  Sr  Sr9  1  0.507  0.946  0.194  1.0
  Sr  Sr10  1  0.806  0.493  0.054  1.0
  Sr  Sr11  1  0.909  0.909  0.909  1.0
  Sr  Sr12  1  0.091  0.091  0.091  1.0
  Sr  Sr13  1  0.853  0.584  0.206  1.0
  Sr  Sr14  1  0.808  0.307  0.794  1.0
  Sr  Sr15  1  0.206  0.853  0.584  1.0
  Sr  Sr16  1  0.584  0.206  0.853  1.0
  Sr  Sr17  1  0.054  0.806  0.493  1.0
  Sr  Sr18  1  0.493  0.054  0.806  1.0
  Sr  Sr19  1  0.194  0.507  0.946  1.0
  Sr  Sr20  1  0.073  0.413  0.383  1.0
  Sr  Sr21  1  0.500  0.500  0.500  1.0
  Sr  Sr22  1  0.617  0.927  0.587  1.0
  Sr  Sr23  1  0.587  0.617  0.927  1.0
  Sr  Sr24  1  0.000  0.000  0.000  1.0
  Sr  Sr25  1  0.946  0.194  0.507  1.0
  Sr  Sr26  1  0.307  0.794  0.808  1.0
  Sr  Sr27  1  0.206  0.192  0.693  1.0
  Al  Al28  1  0.528  0.733  0.492  1.0
  Al  Al29  1  0.031  0.290  0.182  1.0
  Al  Al30  1  0.508  0.472  0.267  1.0
  Al  Al31  1  0.290  0.182  0.031  1.0
  Al  Al32  1  0.267  0.508  0.472  1.0
  Al  Al33  1  0.640  0.640  0.640  1.0
  Al  Al34  1  0.733  0.492  0.528  1.0
  Al  Al35  1  0.182  0.031  0.290  1.0
  Al  Al36  1  0.360  0.360  0.360  1.0
  Al  Al37  1  0.776  0.776  0.776  1.0
  Al  Al38  1  0.472  0.267  0.508  1.0
  Al  Al39  1  0.818  0.969  0.710  1.0
  Al  Al40  1  0.969  0.710  0.818  1.0
  Al  Al41  1  0.492  0.528  0.733  1.0
  Al  Al42  1  0.710  0.818  0.969  1.0
  Al  Al43  1  0.224  0.224  0.224  1.0
  Ge  Ge44  1  0.670  0.096  0.082  1.0
  Ge  Ge45  1  0.082  0.670  0.096  1.0
  Ge  Ge46  1  0.330  0.904  0.918  1.0
  Ge  Ge47  1  0.904  0.918  0.330  1.0
  Ge  Ge48  1  0.918  0.330  0.904  1.0
  Ge  Ge49  1  0.096  0.082  0.670  1.0
[/CIF]
.