The crystal structure described by Ba2Ge2Te5 crystallizes in the orthorhombic Pna2_1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to two equivalent Te(1), two equivalent Te(3), two equivalent Te(4), and two equivalent Te(5) atoms. In the second Ba site, Ba(2) is bonded in a 10-coordinate geometry to one Ge(1), one Te(1), two equivalent Te(2), two equivalent Te(3), two equivalent Te(4), and two equivalent Te(5) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one Ba(2), one Ge(2), one Te(2), one Te(4), and one Te(5) atom to form distorted GeBaGeTe3 tetrahedra that share  a cornercorner with one Ge(2)GeTe3 tetrahedra, corners with two equivalent Te(4)Ba4Ge trigonal bipyramids, corners with two equivalent Te(5)Ba4Ge trigonal bipyramids, and corners with three equivalent Te(3)Ba4Ge trigonal bipyramids. In the second Ge site, Ge(2) is bonded to one Ge(1), one Te(1), one Te(2), and one Te(3) atom to form distorted GeGeTe3 tetrahedra that share  a cornercorner with one Ge(1)BaGeTe3 tetrahedra,  a cornercorner with one Te(4)Ba4Ge trigonal bipyramid, and  a cornercorner with one Te(5)Ba4Ge trigonal bipyramid. There are five inequivalent Te sites. In the first Te site, Te(5) is bonded to two equivalent Ba(1), two equivalent Ba(2), and one Ge(1) atom to form distorted TeBa4Ge trigonal bipyramids that share  a cornercorner with one Ge(2)GeTe3 tetrahedra, corners with two equivalent Ge(1)BaGeTe3 tetrahedra, corners with four equivalent Te(3)Ba4Ge trigonal bipyramids, corners with four equivalent Te(4)Ba4Ge trigonal bipyramids,  an edgeedge with one Te(4)Ba4Ge trigonal bipyramid, edges with two equivalent Te(3)Ba4Ge trigonal bipyramids, edges with two equivalent Te(5)Ba4Ge trigonal bipyramids, and  a faceface with one Te(4)Ba4Ge trigonal bipyramid. In the second Te site, Te(1) is bonded in a distorted see-saw-like geometry to one Ba(2), two equivalent Ba(1), and one Ge(2) atom. In the third Te site, Te(2) is bonded in a 4-coordinate geometry to two equivalent Ba(2), one Ge(1), and one Ge(2) atom. In the fourth Te site, Te(3) is bonded to two equivalent Ba(1), two equivalent Ba(2), and one Ge(2) atom to form distorted TeBa4Ge trigonal bipyramids that share corners with three equivalent Ge(1)BaGeTe3 tetrahedra, corners with four equivalent Te(3)Ba4Ge trigonal bipyramids, corners with four equivalent Te(5)Ba4Ge trigonal bipyramids, edges with two equivalent Te(5)Ba4Ge trigonal bipyramids, and edges with four equivalent Te(4)Ba4Ge trigonal bipyramids. In the fifth Te site, Te(4) is bonded to two equivalent Ba(1), two equivalent Ba(2), and one Ge(1) atom to form distorted TeBa4Ge trigonal bipyramids that share  a cornercorner with one Ge(2)GeTe3 tetrahedra, corners with two equivalent Ge(1)BaGeTe3 tetrahedra, corners with four equivalent Te(4)Ba4Ge trigonal bipyramids, corners with four equivalent Te(5)Ba4Ge trigonal bipyramids,  an edgeedge with one Te(5)Ba4Ge trigonal bipyramid, edges with four equivalent Te(3)Ba4Ge trigonal bipyramids, and  a faceface with one Te(5)Ba4Ge trigonal bipyramid. is represented by the CIF file [CIF]
data_Ba2Ge2Te5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.336
_cell_length_b   10.078
_cell_length_c   13.618
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1281.285
_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
  Ba  Ba0  1  0.604  0.919  0.335  1.0
  Ba  Ba1  1  0.396  0.419  0.665  1.0
  Ba  Ba2  1  0.896  0.919  0.835  1.0
  Ba  Ba3  1  0.104  0.419  0.165  1.0
  Ba  Ba4  1  0.561  0.437  0.318  1.0
  Ba  Ba5  1  0.439  0.937  0.682  1.0
  Ba  Ba6  1  0.939  0.437  0.818  1.0
  Ba  Ba7  1  0.061  0.937  0.182  1.0
  Ge  Ge8  1  0.178  0.729  0.522  1.0
  Ge  Ge9  1  0.822  0.229  0.478  1.0
  Ge  Ge10  1  0.322  0.729  0.022  1.0
  Ge  Ge11  1  0.678  0.229  0.978  1.0
  Ge  Ge12  1  0.026  0.564  0.436  1.0
  Ge  Ge13  1  0.974  0.064  0.564  1.0
  Ge  Ge14  1  0.474  0.564  0.936  1.0
  Ge  Ge15  1  0.526  0.064  0.064  1.0
  Te  Te16  1  0.201  0.367  0.417  1.0
  Te  Te17  1  0.799  0.867  0.583  1.0
  Te  Te18  1  0.299  0.367  0.917  1.0
  Te  Te19  1  0.701  0.867  0.083  1.0
  Te  Te20  1  0.175  0.971  0.447  1.0
  Te  Te21  1  0.825  0.471  0.553  1.0
  Te  Te22  1  0.325  0.971  0.947  1.0
  Te  Te23  1  0.675  0.471  0.053  1.0
  Te  Te24  1  0.879  0.656  0.290  1.0
  Te  Te25  1  0.121  0.156  0.710  1.0
  Te  Te26  1  0.621  0.656  0.790  1.0
  Te  Te27  1  0.379  0.156  0.210  1.0
  Te  Te28  1  0.157  0.701  0.712  1.0
  Te  Te29  1  0.843  0.201  0.288  1.0
  Te  Te30  1  0.343  0.701  0.212  1.0
  Te  Te31  1  0.657  0.201  0.788  1.0
  Te  Te32  1  0.451  0.683  0.496  1.0
  Te  Te33  1  0.549  0.183  0.504  1.0
  Te  Te34  1  0.049  0.683  0.996  1.0
  Te  Te35  1  0.951  0.183  0.004  1.0
[/CIF]
.
The crystal structure described by Ba2Ge2Te5 crystallizes in the orthorhombic Pna2_1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to two equivalent Te(1), two equivalent Te(3), two equivalent Te(4), and two equivalent Te(5) atoms. In the second Ba site, Ba(2) is bonded in a 10-coordinate geometry to one Ge(1), one Te(1), two equivalent Te(2), two equivalent Te(3), two equivalent Te(4), and two equivalent Te(5) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one Ba(2), one Ge(2), one Te(2), one Te(4), and one Te(5) atom to form distorted GeBaGeTe3 tetrahedra that share  a cornercorner with one Ge(2)GeTe3 tetrahedra, corners with two equivalent Te(4)Ba4Ge trigonal bipyramids, corners with two equivalent Te(5)Ba4Ge trigonal bipyramids, and corners with three equivalent Te(3)Ba4Ge trigonal bipyramids. In the second Ge site, Ge(2) is bonded to one Ge(1), one Te(1), one Te(2), and one Te(3) atom to form distorted GeGeTe3 tetrahedra that share  a cornercorner with one Ge(1)BaGeTe3 tetrahedra,  a cornercorner with one Te(4)Ba4Ge trigonal bipyramid, and  a cornercorner with one Te(5)Ba4Ge trigonal bipyramid. There are five inequivalent Te sites. In the first Te site, Te(5) is bonded to two equivalent Ba(1), two equivalent Ba(2), and one Ge(1) atom to form distorted TeBa4Ge trigonal bipyramids that share  a cornercorner with one Ge(2)GeTe3 tetrahedra, corners with two equivalent Ge(1)BaGeTe3 tetrahedra, corners with four equivalent Te(3)Ba4Ge trigonal bipyramids, corners with four equivalent Te(4)Ba4Ge trigonal bipyramids,  an edgeedge with one Te(4)Ba4Ge trigonal bipyramid, edges with two equivalent Te(3)Ba4Ge trigonal bipyramids, edges with two equivalent Te(5)Ba4Ge trigonal bipyramids, and  a faceface with one Te(4)Ba4Ge trigonal bipyramid. In the second Te site, Te(1) is bonded in a distorted see-saw-like geometry to one Ba(2), two equivalent Ba(1), and one Ge(2) atom. In the third Te site, Te(2) is bonded in a 4-coordinate geometry to two equivalent Ba(2), one Ge(1), and one Ge(2) atom. In the fourth Te site, Te(3) is bonded to two equivalent Ba(1), two equivalent Ba(2), and one Ge(2) atom to form distorted TeBa4Ge trigonal bipyramids that share corners with three equivalent Ge(1)BaGeTe3 tetrahedra, corners with four equivalent Te(3)Ba4Ge trigonal bipyramids, corners with four equivalent Te(5)Ba4Ge trigonal bipyramids, edges with two equivalent Te(5)Ba4Ge trigonal bipyramids, and edges with four equivalent Te(4)Ba4Ge trigonal bipyramids. In the fifth Te site, Te(4) is bonded to two equivalent Ba(1), two equivalent Ba(2), and one Ge(1) atom to form distorted TeBa4Ge trigonal bipyramids that share  a cornercorner with one Ge(2)GeTe3 tetrahedra, corners with two equivalent Ge(1)BaGeTe3 tetrahedra, corners with four equivalent Te(4)Ba4Ge trigonal bipyramids, corners with four equivalent Te(5)Ba4Ge trigonal bipyramids,  an edgeedge with one Te(5)Ba4Ge trigonal bipyramid, edges with four equivalent Te(3)Ba4Ge trigonal bipyramids, and  a faceface with one Te(5)Ba4Ge trigonal bipyramid. is represented by the CIF file [CIF]
data_Ba2Ge2Te5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.336
_cell_length_b   10.078
_cell_length_c   13.618
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1281.285
_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
  Ba  Ba0  1  0.604  0.919  0.335  1.0
  Ba  Ba1  1  0.396  0.419  0.665  1.0
  Ba  Ba2  1  0.896  0.919  0.835  1.0
  Ba  Ba3  1  0.104  0.419  0.165  1.0
  Ba  Ba4  1  0.561  0.437  0.318  1.0
  Ba  Ba5  1  0.439  0.937  0.682  1.0
  Ba  Ba6  1  0.939  0.437  0.818  1.0
  Ba  Ba7  1  0.061  0.937  0.182  1.0
  Ge  Ge8  1  0.178  0.729  0.522  1.0
  Ge  Ge9  1  0.822  0.229  0.478  1.0
  Ge  Ge10  1  0.322  0.729  0.022  1.0
  Ge  Ge11  1  0.678  0.229  0.978  1.0
  Ge  Ge12  1  0.026  0.564  0.436  1.0
  Ge  Ge13  1  0.974  0.064  0.564  1.0
  Ge  Ge14  1  0.474  0.564  0.936  1.0
  Ge  Ge15  1  0.526  0.064  0.064  1.0
  Te  Te16  1  0.201  0.367  0.417  1.0
  Te  Te17  1  0.799  0.867  0.583  1.0
  Te  Te18  1  0.299  0.367  0.917  1.0
  Te  Te19  1  0.701  0.867  0.083  1.0
  Te  Te20  1  0.175  0.971  0.447  1.0
  Te  Te21  1  0.825  0.471  0.553  1.0
  Te  Te22  1  0.325  0.971  0.947  1.0
  Te  Te23  1  0.675  0.471  0.053  1.0
  Te  Te24  1  0.879  0.656  0.290  1.0
  Te  Te25  1  0.121  0.156  0.710  1.0
  Te  Te26  1  0.621  0.656  0.790  1.0
  Te  Te27  1  0.379  0.156  0.210  1.0
  Te  Te28  1  0.157  0.701  0.712  1.0
  Te  Te29  1  0.843  0.201  0.288  1.0
  Te  Te30  1  0.343  0.701  0.212  1.0
  Te  Te31  1  0.657  0.201  0.788  1.0
  Te  Te32  1  0.451  0.683  0.496  1.0
  Te  Te33  1  0.549  0.183  0.504  1.0
  Te  Te34  1  0.049  0.683  0.996  1.0
  Te  Te35  1  0.951  0.183  0.004  1.0
[/CIF]
.