The crystal structure described by Ba2Nd2Si4O13 crystallizes in the triclinic P-1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 11-coordinate geometry to one O(12), one O(13), one O(4), one O(7), one O(9), two equivalent O(11), two equivalent O(5), and two equivalent O(6) atoms. In the second Ba site, Ba(2) is bonded in a 10-coordinate geometry to one O(1), one O(10), one O(12), one O(2), one O(4), one O(7), two equivalent O(3), and two equivalent O(8) atoms. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 8-coordinate geometry to one O(10), one O(13), one O(5), one O(8), two equivalent O(12), and two equivalent O(2) atoms. In the second Nd site, Nd(2) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(4), two equivalent O(7), and two equivalent O(9) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(13), one O(3), one O(7), and one O(9) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(3), one O(4), and one O(8) atom to form corner-sharing SiO4 tetrahedra. In the third Si site, Si(3) is bonded to one O(1), one O(11), one O(5), and one O(6) atom to form corner-sharing SiO4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(10), one O(12), one O(2), and one O(6) atom to form corner-sharing SiO4 tetrahedra. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Ba(2), one Si(2), and one Si(3) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ba(2), two equivalent Nd(1), and one Si(4) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to two equivalent Ba(2), one Si(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Nd(2), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to two equivalent Ba(1), one Nd(1), and one Si(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to two equivalent Ba(1), one Si(3), and one Si(4) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), two equivalent Nd(2), and one Si(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to two equivalent Ba(2), one Nd(1), and one Si(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Ba(1), two equivalent Nd(2), and one Si(1) atom. In the tenth O site, O(10) is bonded in a 1-coordinate geometry to one Ba(2), one Nd(1), one Nd(2), and one Si(4) atom. In the eleventh O site, O(11) is bonded in a distorted bent 150 degrees geometry to two equivalent Ba(1), one Nd(2), and one Si(3) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), two equivalent Nd(1), and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a 1-coordinate geometry to one Ba(1), one Nd(1), one Nd(2), and one Si(1) atom. is represented by the CIF file [CIF]
data_Ba2Nd2Si4O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.725
_cell_length_b   9.032
_cell_length_c   10.228
_cell_angle_alpha   86.485
_cell_angle_beta   73.583
_cell_angle_gamma   86.455
_symmetry_Int_Tables_number   1
_cell_volume   594.132
_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
  Ba  Ba0  1  0.271  0.170  0.444  1.0
  Ba  Ba1  1  0.745  0.673  0.926  1.0
  Ba  Ba2  1  0.255  0.327  0.074  1.0
  Ba  Ba3  1  0.729  0.830  0.556  1.0
  Nd  Nd4  1  0.194  0.880  0.102  1.0
  Nd  Nd5  1  0.806  0.120  0.898  1.0
  Nd  Nd6  1  0.311  0.608  0.396  1.0
  Nd  Nd7  1  0.689  0.392  0.604  1.0
  Si  Si8  1  0.105  0.440  0.687  1.0
  Si  Si9  1  0.302  0.622  0.845  1.0
  Si  Si10  1  0.823  0.114  0.324  1.0
  Si  Si11  1  0.895  0.560  0.313  1.0
  Si  Si12  1  0.389  0.067  0.823  1.0
  Si  Si13  1  0.177  0.886  0.676  1.0
  Si  Si14  1  0.698  0.378  0.155  1.0
  Si  Si15  1  0.611  0.933  0.177  1.0
  O  O16  1  0.168  0.773  0.812  1.0
  O  O17  1  0.838  0.905  0.065  1.0
  O  O18  1  0.850  0.516  0.166  1.0
  O  O19  1  0.531  0.604  0.740  1.0
  O  O20  1  0.053  0.038  0.296  1.0
  O  O21  1  0.947  0.962  0.704  1.0
  O  O22  1  0.652  0.984  0.322  1.0
  O  O23  1  0.029  0.425  0.369  1.0
  O  O24  1  0.832  0.227  0.188  1.0
  O  O25  1  0.304  0.630  0.002  1.0
  O  O26  1  0.331  0.414  0.574  1.0
  O  O27  1  0.528  0.214  0.796  1.0
  O  O28  1  0.469  0.396  0.260  1.0
  O  O29  1  0.721  0.184  0.470  1.0
  O  O30  1  0.472  0.786  0.204  1.0
  O  O31  1  0.279  0.816  0.530  1.0
  O  O32  1  0.483  0.071  0.120  1.0
  O  O33  1  0.150  0.484  0.834  1.0
  O  O34  1  0.162  0.095  0.935  1.0
  O  O35  1  0.968  0.292  0.708  1.0
  O  O36  1  0.971  0.575  0.631  1.0
  O  O37  1  0.348  0.016  0.678  1.0
  O  O38  1  0.669  0.586  0.426  1.0
  O  O39  1  0.696  0.370  0.998  1.0
  O  O40  1  0.032  0.708  0.292  1.0
  O  O41  1  0.517  0.929  0.880  1.0
[/CIF]
.
The crystal structure described by Ba2Nd2Si4O13 crystallizes in the triclinic P-1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 11-coordinate geometry to one O(12), one O(13), one O(4), one O(7), one O(9), two equivalent O(11), two equivalent O(5), and two equivalent O(6) atoms. In the second Ba site, Ba(2) is bonded in a 10-coordinate geometry to one O(1), one O(10), one O(12), one O(2), one O(4), one O(7), two equivalent O(3), and two equivalent O(8) atoms. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 8-coordinate geometry to one O(10), one O(13), one O(5), one O(8), two equivalent O(12), and two equivalent O(2) atoms. In the second Nd site, Nd(2) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(13), one O(4), two equivalent O(7), and two equivalent O(9) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(13), one O(3), one O(7), and one O(9) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(3), one O(4), and one O(8) atom to form corner-sharing SiO4 tetrahedra. In the third Si site, Si(3) is bonded to one O(1), one O(11), one O(5), and one O(6) atom to form corner-sharing SiO4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(10), one O(12), one O(2), and one O(6) atom to form corner-sharing SiO4 tetrahedra. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Ba(2), one Si(2), and one Si(3) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ba(2), two equivalent Nd(1), and one Si(4) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to two equivalent Ba(2), one Si(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Nd(2), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to two equivalent Ba(1), one Nd(1), and one Si(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to two equivalent Ba(1), one Si(3), and one Si(4) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), two equivalent Nd(2), and one Si(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to two equivalent Ba(2), one Nd(1), and one Si(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Ba(1), two equivalent Nd(2), and one Si(1) atom. In the tenth O site, O(10) is bonded in a 1-coordinate geometry to one Ba(2), one Nd(1), one Nd(2), and one Si(4) atom. In the eleventh O site, O(11) is bonded in a distorted bent 150 degrees geometry to two equivalent Ba(1), one Nd(2), and one Si(3) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one Ba(1), one Ba(2), two equivalent Nd(1), and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a 1-coordinate geometry to one Ba(1), one Nd(1), one Nd(2), and one Si(1) atom. is represented by the CIF file [CIF]
data_Ba2Nd2Si4O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.725
_cell_length_b   9.032
_cell_length_c   10.228
_cell_angle_alpha   86.485
_cell_angle_beta   73.583
_cell_angle_gamma   86.455
_symmetry_Int_Tables_number   1
_cell_volume   594.132
_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
  Ba  Ba0  1  0.271  0.170  0.444  1.0
  Ba  Ba1  1  0.745  0.673  0.926  1.0
  Ba  Ba2  1  0.255  0.327  0.074  1.0
  Ba  Ba3  1  0.729  0.830  0.556  1.0
  Nd  Nd4  1  0.194  0.880  0.102  1.0
  Nd  Nd5  1  0.806  0.120  0.898  1.0
  Nd  Nd6  1  0.311  0.608  0.396  1.0
  Nd  Nd7  1  0.689  0.392  0.604  1.0
  Si  Si8  1  0.105  0.440  0.687  1.0
  Si  Si9  1  0.302  0.622  0.845  1.0
  Si  Si10  1  0.823  0.114  0.324  1.0
  Si  Si11  1  0.895  0.560  0.313  1.0
  Si  Si12  1  0.389  0.067  0.823  1.0
  Si  Si13  1  0.177  0.886  0.676  1.0
  Si  Si14  1  0.698  0.378  0.155  1.0
  Si  Si15  1  0.611  0.933  0.177  1.0
  O  O16  1  0.168  0.773  0.812  1.0
  O  O17  1  0.838  0.905  0.065  1.0
  O  O18  1  0.850  0.516  0.166  1.0
  O  O19  1  0.531  0.604  0.740  1.0
  O  O20  1  0.053  0.038  0.296  1.0
  O  O21  1  0.947  0.962  0.704  1.0
  O  O22  1  0.652  0.984  0.322  1.0
  O  O23  1  0.029  0.425  0.369  1.0
  O  O24  1  0.832  0.227  0.188  1.0
  O  O25  1  0.304  0.630  0.002  1.0
  O  O26  1  0.331  0.414  0.574  1.0
  O  O27  1  0.528  0.214  0.796  1.0
  O  O28  1  0.469  0.396  0.260  1.0
  O  O29  1  0.721  0.184  0.470  1.0
  O  O30  1  0.472  0.786  0.204  1.0
  O  O31  1  0.279  0.816  0.530  1.0
  O  O32  1  0.483  0.071  0.120  1.0
  O  O33  1  0.150  0.484  0.834  1.0
  O  O34  1  0.162  0.095  0.935  1.0
  O  O35  1  0.968  0.292  0.708  1.0
  O  O36  1  0.971  0.575  0.631  1.0
  O  O37  1  0.348  0.016  0.678  1.0
  O  O38  1  0.669  0.586  0.426  1.0
  O  O39  1  0.696  0.370  0.998  1.0
  O  O40  1  0.032  0.708  0.292  1.0
  O  O41  1  0.517  0.929  0.880  1.0
[/CIF]
.