The structure described by Ba2Yb2Al4Si3(N5O2)2 crystallizes in the triclinic P1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 7-coordinate geometry to one N(2), one N(3), one N(6), one N(7), one N(8), one N(9), and one O(3) atom. In the second Ba site, Ba(2) is bonded in a 2-coordinate geometry to one N(4), one N(6), one N(9), one O(3), and one O(4) atom. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 6-coordinate geometry to one N(2), one N(3), one O(1), one O(2), one O(3), and one O(4) atom. In the second Yb site, Yb(2) is bonded in a 4-coordinate geometry to one N(2), one N(3), one N(8), and one N(9) atom. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded in a 4-coordinate geometry to one N(10), one N(5), one N(7), one N(8), and one O(2) atom. In the second Al site, Al(2) is bonded in a distorted trigonal non-coplanar geometry to one N(3), one N(6), and one O(1) atom. In the third Al site, Al(3) is bonded in a trigonal planar geometry to one N(2), one N(6), and one N(7) atom. In the fourth Al site, Al(4) is bonded in a distorted see-saw-like geometry to one N(10), one N(2), one N(3), and one O(4) atom. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one N(1), one N(8), one N(9), and one O(1) atom to form corner-sharing SiN3O tetrahedra. In the second Si site, Si(2) is bonded in a 3-coordinate geometry to one N(1), one N(5), and one N(7) atom. In the third Si site, Si(3) is bonded to one N(5), one N(9), one O(2), and one O(4) atom to form corner-sharing SiN2O2 tetrahedra. There are ten inequivalent N sites. In the first N site, N(1) is bonded in a 3-coordinate geometry to one Si(1), one Si(2), and one N(4) atom. In the second N site, N(2) is bonded to one Ba(1), one Yb(1), one Yb(2), one Al(3), and one Al(4) atom to form distorted NBaYb2Al2 trigonal bipyramids that share corners with two equivalent N(6)Ba2Al2 tetrahedra and  an edgeedge with one O(3)Ba2YbN tetrahedra. In the third N site, N(3) is bonded in a 4-coordinate geometry to one Ba(1), one Yb(1), one Yb(2), one Al(2), and one Al(4) atom. In the fourth N site, N(4) is bonded in a trigonal non-coplanar geometry to one Ba(2), one N(1), and one N(5) atom. In the fifth N site, N(5) is bonded in a 4-coordinate geometry to one Al(1), one Si(2), one Si(3), and one N(4) atom. In the sixth N site, N(6) is bonded to one Ba(1), one Ba(2), one Al(2), and one Al(3) atom to form distorted NBa2Al2 tetrahedra that share corners with two equivalent N(2)BaYb2Al2 trigonal bipyramids and  an edgeedge with one O(3)Ba2YbN tetrahedra. In the seventh N site, N(7) is bonded in a 3-coordinate geometry to one Ba(1), one Al(1), one Al(3), and one Si(2) atom. In the eighth N site, N(8) is bonded in a 4-coordinate geometry to one Ba(1), one Yb(2), one Al(1), and one Si(1) atom. In the ninth N site, N(9) is bonded in a 5-coordinate geometry to one Ba(1), one Ba(2), one Yb(2), one Si(1), and one Si(3) atom. In the tenth N site, N(10) is bonded in a distorted trigonal planar geometry to one Al(1), one Al(4), and one O(3) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Yb(1), one Al(2), and one Si(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Yb(1), one Al(1), and one Si(3) atom. In the third O site, O(3) is bonded to one Ba(1), one Ba(2), one Yb(1), and one N(10) atom to form distorted OBa2YbN tetrahedra that share  an edgeedge with one N(6)Ba2Al2 tetrahedra and  an edgeedge with one N(2)BaYb2Al2 trigonal bipyramid. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ba(2), one Yb(1), one Al(4), and one Si(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ba2Yb2Al4Si3(N5O2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.605
_cell_length_b   8.091
_cell_length_c   8.340
_cell_angle_alpha   108.610
_cell_angle_beta   72.839
_cell_angle_gamma   131.245
_symmetry_Int_Tables_number   1
_cell_volume   363.108
_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
  Ba  Ba0  1  0.409  0.654  0.092  1.0
  Ba  Ba1  1  0.662  0.483  0.621  1.0
  Yb  Yb2  1  0.293  0.706  0.798  1.0
  Yb  Yb3  1  0.740  0.239  0.220  1.0
  Al  Al4  1  0.662  0.840  0.459  1.0
  Al  Al5  1  0.340  0.101  0.922  1.0
  Al  Al6  1  0.747  0.506  0.050  1.0
  Al  Al7  1  0.800  0.201  0.833  1.0
  Si  Si8  1  0.284  0.856  0.477  1.0
  Si  Si9  1  0.060  0.942  0.202  1.0
  Si  Si10  1  0.113  0.418  0.483  1.0
  N  N11  1  0.209  0.985  0.383  1.0
  N  N12  1  0.972  0.465  0.000  1.0
  N  N13  1  0.513  0.056  0.988  1.0
  N  N14  1  0.196  0.144  0.474  1.0
  N  N15  1  0.090  0.167  0.384  1.0
  N  N16  1  0.519  0.397  0.925  1.0
  N  N17  1  0.772  0.714  0.249  1.0
  N  N18  1  0.568  0.971  0.394  1.0
  N  N19  1  0.081  0.563  0.398  1.0
  N  N20  1  0.758  0.947  0.685  1.0
  O  O21  1  0.243  0.916  0.694  1.0
  O  O22  1  0.387  0.581  0.524  1.0
  O  O23  1  0.641  0.781  0.795  1.0
  O  O24  1  0.942  0.367  0.663  1.0
[/CIF]
.
The structure described by Ba2Yb2Al4Si3(N5O2)2 crystallizes in the triclinic P1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 7-coordinate geometry to one N(2), one N(3), one N(6), one N(7), one N(8), one N(9), and one O(3) atom. In the second Ba site, Ba(2) is bonded in a 2-coordinate geometry to one N(4), one N(6), one N(9), one O(3), and one O(4) atom. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 6-coordinate geometry to one N(2), one N(3), one O(1), one O(2), one O(3), and one O(4) atom. In the second Yb site, Yb(2) is bonded in a 4-coordinate geometry to one N(2), one N(3), one N(8), and one N(9) atom. There are four inequivalent Al sites. In the first Al site, Al(1) is bonded in a 4-coordinate geometry to one N(10), one N(5), one N(7), one N(8), and one O(2) atom. In the second Al site, Al(2) is bonded in a distorted trigonal non-coplanar geometry to one N(3), one N(6), and one O(1) atom. In the third Al site, Al(3) is bonded in a trigonal planar geometry to one N(2), one N(6), and one N(7) atom. In the fourth Al site, Al(4) is bonded in a distorted see-saw-like geometry to one N(10), one N(2), one N(3), and one O(4) atom. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one N(1), one N(8), one N(9), and one O(1) atom to form corner-sharing SiN3O tetrahedra. In the second Si site, Si(2) is bonded in a 3-coordinate geometry to one N(1), one N(5), and one N(7) atom. In the third Si site, Si(3) is bonded to one N(5), one N(9), one O(2), and one O(4) atom to form corner-sharing SiN2O2 tetrahedra. There are ten inequivalent N sites. In the first N site, N(1) is bonded in a 3-coordinate geometry to one Si(1), one Si(2), and one N(4) atom. In the second N site, N(2) is bonded to one Ba(1), one Yb(1), one Yb(2), one Al(3), and one Al(4) atom to form distorted NBaYb2Al2 trigonal bipyramids that share corners with two equivalent N(6)Ba2Al2 tetrahedra and  an edgeedge with one O(3)Ba2YbN tetrahedra. In the third N site, N(3) is bonded in a 4-coordinate geometry to one Ba(1), one Yb(1), one Yb(2), one Al(2), and one Al(4) atom. In the fourth N site, N(4) is bonded in a trigonal non-coplanar geometry to one Ba(2), one N(1), and one N(5) atom. In the fifth N site, N(5) is bonded in a 4-coordinate geometry to one Al(1), one Si(2), one Si(3), and one N(4) atom. In the sixth N site, N(6) is bonded to one Ba(1), one Ba(2), one Al(2), and one Al(3) atom to form distorted NBa2Al2 tetrahedra that share corners with two equivalent N(2)BaYb2Al2 trigonal bipyramids and  an edgeedge with one O(3)Ba2YbN tetrahedra. In the seventh N site, N(7) is bonded in a 3-coordinate geometry to one Ba(1), one Al(1), one Al(3), and one Si(2) atom. In the eighth N site, N(8) is bonded in a 4-coordinate geometry to one Ba(1), one Yb(2), one Al(1), and one Si(1) atom. In the ninth N site, N(9) is bonded in a 5-coordinate geometry to one Ba(1), one Ba(2), one Yb(2), one Si(1), and one Si(3) atom. In the tenth N site, N(10) is bonded in a distorted trigonal planar geometry to one Al(1), one Al(4), and one O(3) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Yb(1), one Al(2), and one Si(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Yb(1), one Al(1), and one Si(3) atom. In the third O site, O(3) is bonded to one Ba(1), one Ba(2), one Yb(1), and one N(10) atom to form distorted OBa2YbN tetrahedra that share  an edgeedge with one N(6)Ba2Al2 tetrahedra and  an edgeedge with one N(2)BaYb2Al2 trigonal bipyramid. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ba(2), one Yb(1), one Al(4), and one Si(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ba2Yb2Al4Si3(N5O2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.605
_cell_length_b   8.091
_cell_length_c   8.340
_cell_angle_alpha   108.610
_cell_angle_beta   72.839
_cell_angle_gamma   131.245
_symmetry_Int_Tables_number   1
_cell_volume   363.108
_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
  Ba  Ba0  1  0.409  0.654  0.092  1.0
  Ba  Ba1  1  0.662  0.483  0.621  1.0
  Yb  Yb2  1  0.293  0.706  0.798  1.0
  Yb  Yb3  1  0.740  0.239  0.220  1.0
  Al  Al4  1  0.662  0.840  0.459  1.0
  Al  Al5  1  0.340  0.101  0.922  1.0
  Al  Al6  1  0.747  0.506  0.050  1.0
  Al  Al7  1  0.800  0.201  0.833  1.0
  Si  Si8  1  0.284  0.856  0.477  1.0
  Si  Si9  1  0.060  0.942  0.202  1.0
  Si  Si10  1  0.113  0.418  0.483  1.0
  N  N11  1  0.209  0.985  0.383  1.0
  N  N12  1  0.972  0.465  0.000  1.0
  N  N13  1  0.513  0.056  0.988  1.0
  N  N14  1  0.196  0.144  0.474  1.0
  N  N15  1  0.090  0.167  0.384  1.0
  N  N16  1  0.519  0.397  0.925  1.0
  N  N17  1  0.772  0.714  0.249  1.0
  N  N18  1  0.568  0.971  0.394  1.0
  N  N19  1  0.081  0.563  0.398  1.0
  N  N20  1  0.758  0.947  0.685  1.0
  O  O21  1  0.243  0.916  0.694  1.0
  O  O22  1  0.387  0.581  0.524  1.0
  O  O23  1  0.641  0.781  0.795  1.0
  O  O24  1  0.942  0.367  0.663  1.0
[/CIF]
.