The structure described by Sr3(GeAs2)2 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one As(2), one As(3), two equivalent As(1), and two equivalent As(4) atoms to form distorted SrAs6 octahedra that share corners with two equivalent Sr(2)As6 octahedra, corners with two equivalent Sr(3)As6 octahedra, corners with four equivalent Ge(2)GeAs3 tetrahedra, edges with two equivalent Sr(1)As6 octahedra, edges with three equivalent Sr(2)As6 octahedra, edges with three equivalent Sr(3)As6 octahedra, and  an edgeedge with one Ge(2)GeAs3 tetrahedra. The corner-sharing octahedral tilt angles range from 3-11°. In the second Sr site, Sr(2) is bonded to one As(1), one As(4), two equivalent As(2), and two equivalent As(3) atoms to form SrAs6 octahedra that share corners with two equivalent Sr(1)As6 octahedra, corners with two equivalent Sr(3)As6 octahedra,  a cornercorner with one Ge(2)GeAs3 tetrahedra, edges with two equivalent Sr(2)As6 octahedra, edges with three equivalent Sr(1)As6 octahedra, edges with four equivalent Sr(3)As6 octahedra, and  an edgeedge with one Ge(2)GeAs3 tetrahedra. The corner-sharing octahedral tilt angles range from 2-11°. In the third Sr site, Sr(3) is bonded to one As(1), one As(4), two equivalent As(2), and two equivalent As(3) atoms to form distorted SrAs6 octahedra that share corners with two equivalent Sr(1)As6 octahedra, corners with two equivalent Sr(2)As6 octahedra, corners with three equivalent Ge(2)GeAs3 tetrahedra, edges with two equivalent Sr(3)As6 octahedra, edges with three equivalent Sr(1)As6 octahedra, and edges with four equivalent Sr(2)As6 octahedra. The corner-sharing octahedral tilt angles range from 2-8°. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 4-coordinate geometry to one Ge(2), one As(1), one As(2), and one As(3) atom. In the second Ge site, Ge(2) is bonded to one Ge(1), one As(1), and two equivalent As(4) atoms to form distorted GeGeAs3 tetrahedra that share  a cornercorner with one Sr(2)As6 octahedra,  a cornercorner with one As(1)Sr4Ge2 octahedra,  a cornercorner with one As(2)Sr5Ge octahedra,  a cornercorner with one As(3)Sr5Ge octahedra, corners with three equivalent Sr(3)As6 octahedra, corners with four equivalent Sr(1)As6 octahedra, corners with two equivalent Ge(2)GeAs3 tetrahedra,  an edgeedge with one Sr(1)As6 octahedra, and  an edgeedge with one Sr(2)As6 octahedra. The corner-sharing octahedral tilt angles range from 11-83°. There are four inequivalent As sites. In the first As site, As(4) is bonded to one Sr(2), one Sr(3), two equivalent Sr(1), and two equivalent Ge(2) atoms to form AsSr4Ge2 octahedra that share corners with two equivalent As(1)Sr4Ge2 octahedra, corners with two equivalent As(3)Sr5Ge octahedra, corners with four equivalent As(2)Sr5Ge octahedra,  an edgeedge with one As(2)Sr5Ge octahedra, edges with two equivalent As(4)Sr4Ge2 octahedra, edges with two equivalent As(3)Sr5Ge octahedra, and edges with three equivalent As(1)Sr4Ge2 octahedra. The corner-sharing octahedral tilt angles range from 3-94°. In the second As site, As(1) is bonded to one Sr(2), one Sr(3), two equivalent Sr(1), one Ge(1), and one Ge(2) atom to form AsSr4Ge2 octahedra that share  a cornercorner with one As(2)Sr5Ge octahedra, corners with two equivalent As(1)Sr4Ge2 octahedra, corners with two equivalent As(4)Sr4Ge2 octahedra, corners with three equivalent As(3)Sr5Ge octahedra,  a cornercorner with one Ge(2)GeAs3 tetrahedra, edges with two equivalent As(3)Sr5Ge octahedra, edges with three equivalent As(4)Sr4Ge2 octahedra, and edges with three equivalent As(2)Sr5Ge octahedra. The corner-sharing octahedral tilt angles range from 5-94°. In the third As site, As(2) is bonded to one Sr(1), two equivalent Sr(2), two equivalent Sr(3), and one Ge(1) atom to form AsSr5Ge octahedra that share  a cornercorner with one As(1)Sr4Ge2 octahedra, corners with two equivalent As(3)Sr5Ge octahedra, corners with four equivalent As(4)Sr4Ge2 octahedra,  a cornercorner with one Ge(2)GeAs3 tetrahedra,  an edgeedge with one As(4)Sr4Ge2 octahedra, edges with two equivalent As(2)Sr5Ge octahedra, edges with three equivalent As(1)Sr4Ge2 octahedra, and edges with four equivalent As(3)Sr5Ge octahedra. The corner-sharing octahedral tilt angles range from 3-88°. In the fourth As site, As(3) is bonded to one Sr(1), two equivalent Sr(2), two equivalent Sr(3), and one Ge(1) atom to form AsSr5Ge octahedra that share corners with two equivalent As(4)Sr4Ge2 octahedra, corners with two equivalent As(2)Sr5Ge octahedra, corners with three equivalent As(1)Sr4Ge2 octahedra,  a cornercorner with one Ge(2)GeAs3 tetrahedra, edges with two equivalent As(1)Sr4Ge2 octahedra, edges with two equivalent As(4)Sr4Ge2 octahedra, edges with two equivalent As(3)Sr5Ge octahedra, and edges with four equivalent As(2)Sr5Ge octahedra. The corner-sharing octahedral tilt angles range from 3-94°. is represented by the CIF card [CIF]
data_Sr3(GeAs2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   18.623
_cell_length_b   7.503
_cell_length_c   7.671
_cell_angle_alpha   68.093
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   994.497
_cell_formula_units_Z   4
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  0.315  0.012  0.782  1.0
  Sr  Sr1  1  0.815  0.488  0.218  1.0
  Sr  Sr2  1  0.685  0.988  0.218  1.0
  Sr  Sr3  1  0.185  0.512  0.782  1.0
  Sr  Sr4  1  0.440  0.997  0.261  1.0
  Sr  Sr5  1  0.940  0.503  0.739  1.0
  Sr  Sr6  1  0.560  0.003  0.739  1.0
  Sr  Sr7  1  0.060  0.497  0.261  1.0
  Sr  Sr8  1  0.438  0.511  0.745  1.0
  Sr  Sr9  1  0.938  0.989  0.255  1.0
  Sr  Sr10  1  0.562  0.489  0.255  1.0
  Sr  Sr11  1  0.062  0.011  0.745  1.0
  Ge  Ge12  1  0.371  0.472  0.213  1.0
  Ge  Ge13  1  0.871  0.028  0.787  1.0
  Ge  Ge14  1  0.129  0.972  0.213  1.0
  Ge  Ge15  1  0.629  0.528  0.787  1.0
  Ge  Ge16  1  0.240  0.085  0.314  1.0
  Ge  Ge17  1  0.740  0.415  0.686  1.0
  Ge  Ge18  1  0.760  0.915  0.686  1.0
  Ge  Ge19  1  0.260  0.585  0.314  1.0
  As  As20  1  0.186  0.780  0.043  1.0
  As  As21  1  0.686  0.720  0.957  1.0
  As  As22  1  0.814  0.220  0.957  1.0
  As  As23  1  0.314  0.280  0.043  1.0
  As  As24  1  0.061  0.246  0.009  1.0
  As  As25  1  0.561  0.254  0.991  1.0
  As  As26  1  0.939  0.754  0.991  1.0
  As  As27  1  0.439  0.746  0.009  1.0
  As  As28  1  0.068  0.760  0.495  1.0
  As  As29  1  0.568  0.740  0.505  1.0
  As  As30  1  0.432  0.260  0.495  1.0
  As  As31  1  0.932  0.240  0.505  1.0
  As  As32  1  0.199  0.277  0.499  1.0
  As  As33  1  0.699  0.223  0.501  1.0
  As  As34  1  0.801  0.723  0.501  1.0
  As  As35  1  0.301  0.777  0.499  1.0
[/CIF]
.
The structure described by Sr3(GeAs2)2 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one As(2), one As(3), two equivalent As(1), and two equivalent As(4) atoms to form distorted SrAs6 octahedra that share corners with two equivalent Sr(2)As6 octahedra, corners with two equivalent Sr(3)As6 octahedra, corners with four equivalent Ge(2)GeAs3 tetrahedra, edges with two equivalent Sr(1)As6 octahedra, edges with three equivalent Sr(2)As6 octahedra, edges with three equivalent Sr(3)As6 octahedra, and  an edgeedge with one Ge(2)GeAs3 tetrahedra. The corner-sharing octahedral tilt angles range from 3-11°. In the second Sr site, Sr(2) is bonded to one As(1), one As(4), two equivalent As(2), and two equivalent As(3) atoms to form SrAs6 octahedra that share corners with two equivalent Sr(1)As6 octahedra, corners with two equivalent Sr(3)As6 octahedra,  a cornercorner with one Ge(2)GeAs3 tetrahedra, edges with two equivalent Sr(2)As6 octahedra, edges with three equivalent Sr(1)As6 octahedra, edges with four equivalent Sr(3)As6 octahedra, and  an edgeedge with one Ge(2)GeAs3 tetrahedra. The corner-sharing octahedral tilt angles range from 2-11°. In the third Sr site, Sr(3) is bonded to one As(1), one As(4), two equivalent As(2), and two equivalent As(3) atoms to form distorted SrAs6 octahedra that share corners with two equivalent Sr(1)As6 octahedra, corners with two equivalent Sr(2)As6 octahedra, corners with three equivalent Ge(2)GeAs3 tetrahedra, edges with two equivalent Sr(3)As6 octahedra, edges with three equivalent Sr(1)As6 octahedra, and edges with four equivalent Sr(2)As6 octahedra. The corner-sharing octahedral tilt angles range from 2-8°. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 4-coordinate geometry to one Ge(2), one As(1), one As(2), and one As(3) atom. In the second Ge site, Ge(2) is bonded to one Ge(1), one As(1), and two equivalent As(4) atoms to form distorted GeGeAs3 tetrahedra that share  a cornercorner with one Sr(2)As6 octahedra,  a cornercorner with one As(1)Sr4Ge2 octahedra,  a cornercorner with one As(2)Sr5Ge octahedra,  a cornercorner with one As(3)Sr5Ge octahedra, corners with three equivalent Sr(3)As6 octahedra, corners with four equivalent Sr(1)As6 octahedra, corners with two equivalent Ge(2)GeAs3 tetrahedra,  an edgeedge with one Sr(1)As6 octahedra, and  an edgeedge with one Sr(2)As6 octahedra. The corner-sharing octahedral tilt angles range from 11-83°. There are four inequivalent As sites. In the first As site, As(4) is bonded to one Sr(2), one Sr(3), two equivalent Sr(1), and two equivalent Ge(2) atoms to form AsSr4Ge2 octahedra that share corners with two equivalent As(1)Sr4Ge2 octahedra, corners with two equivalent As(3)Sr5Ge octahedra, corners with four equivalent As(2)Sr5Ge octahedra,  an edgeedge with one As(2)Sr5Ge octahedra, edges with two equivalent As(4)Sr4Ge2 octahedra, edges with two equivalent As(3)Sr5Ge octahedra, and edges with three equivalent As(1)Sr4Ge2 octahedra. The corner-sharing octahedral tilt angles range from 3-94°. In the second As site, As(1) is bonded to one Sr(2), one Sr(3), two equivalent Sr(1), one Ge(1), and one Ge(2) atom to form AsSr4Ge2 octahedra that share  a cornercorner with one As(2)Sr5Ge octahedra, corners with two equivalent As(1)Sr4Ge2 octahedra, corners with two equivalent As(4)Sr4Ge2 octahedra, corners with three equivalent As(3)Sr5Ge octahedra,  a cornercorner with one Ge(2)GeAs3 tetrahedra, edges with two equivalent As(3)Sr5Ge octahedra, edges with three equivalent As(4)Sr4Ge2 octahedra, and edges with three equivalent As(2)Sr5Ge octahedra. The corner-sharing octahedral tilt angles range from 5-94°. In the third As site, As(2) is bonded to one Sr(1), two equivalent Sr(2), two equivalent Sr(3), and one Ge(1) atom to form AsSr5Ge octahedra that share  a cornercorner with one As(1)Sr4Ge2 octahedra, corners with two equivalent As(3)Sr5Ge octahedra, corners with four equivalent As(4)Sr4Ge2 octahedra,  a cornercorner with one Ge(2)GeAs3 tetrahedra,  an edgeedge with one As(4)Sr4Ge2 octahedra, edges with two equivalent As(2)Sr5Ge octahedra, edges with three equivalent As(1)Sr4Ge2 octahedra, and edges with four equivalent As(3)Sr5Ge octahedra. The corner-sharing octahedral tilt angles range from 3-88°. In the fourth As site, As(3) is bonded to one Sr(1), two equivalent Sr(2), two equivalent Sr(3), and one Ge(1) atom to form AsSr5Ge octahedra that share corners with two equivalent As(4)Sr4Ge2 octahedra, corners with two equivalent As(2)Sr5Ge octahedra, corners with three equivalent As(1)Sr4Ge2 octahedra,  a cornercorner with one Ge(2)GeAs3 tetrahedra, edges with two equivalent As(1)Sr4Ge2 octahedra, edges with two equivalent As(4)Sr4Ge2 octahedra, edges with two equivalent As(3)Sr5Ge octahedra, and edges with four equivalent As(2)Sr5Ge octahedra. The corner-sharing octahedral tilt angles range from 3-94°. is represented by the CIF card [CIF]
data_Sr3(GeAs2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   18.623
_cell_length_b   7.503
_cell_length_c   7.671
_cell_angle_alpha   68.093
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   994.497
_cell_formula_units_Z   4
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  0.315  0.012  0.782  1.0
  Sr  Sr1  1  0.815  0.488  0.218  1.0
  Sr  Sr2  1  0.685  0.988  0.218  1.0
  Sr  Sr3  1  0.185  0.512  0.782  1.0
  Sr  Sr4  1  0.440  0.997  0.261  1.0
  Sr  Sr5  1  0.940  0.503  0.739  1.0
  Sr  Sr6  1  0.560  0.003  0.739  1.0
  Sr  Sr7  1  0.060  0.497  0.261  1.0
  Sr  Sr8  1  0.438  0.511  0.745  1.0
  Sr  Sr9  1  0.938  0.989  0.255  1.0
  Sr  Sr10  1  0.562  0.489  0.255  1.0
  Sr  Sr11  1  0.062  0.011  0.745  1.0
  Ge  Ge12  1  0.371  0.472  0.213  1.0
  Ge  Ge13  1  0.871  0.028  0.787  1.0
  Ge  Ge14  1  0.129  0.972  0.213  1.0
  Ge  Ge15  1  0.629  0.528  0.787  1.0
  Ge  Ge16  1  0.240  0.085  0.314  1.0
  Ge  Ge17  1  0.740  0.415  0.686  1.0
  Ge  Ge18  1  0.760  0.915  0.686  1.0
  Ge  Ge19  1  0.260  0.585  0.314  1.0
  As  As20  1  0.186  0.780  0.043  1.0
  As  As21  1  0.686  0.720  0.957  1.0
  As  As22  1  0.814  0.220  0.957  1.0
  As  As23  1  0.314  0.280  0.043  1.0
  As  As24  1  0.061  0.246  0.009  1.0
  As  As25  1  0.561  0.254  0.991  1.0
  As  As26  1  0.939  0.754  0.991  1.0
  As  As27  1  0.439  0.746  0.009  1.0
  As  As28  1  0.068  0.760  0.495  1.0
  As  As29  1  0.568  0.740  0.505  1.0
  As  As30  1  0.432  0.260  0.495  1.0
  As  As31  1  0.932  0.240  0.505  1.0
  As  As32  1  0.199  0.277  0.499  1.0
  As  As33  1  0.699  0.223  0.501  1.0
  As  As34  1  0.801  0.723  0.501  1.0
  As  As35  1  0.301  0.777  0.499  1.0
[/CIF]
.