The crystal structure described by Ba2NdGaSe5 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 8-coordinate geometry to one Se(1), one Se(4), two equivalent Se(2), two equivalent Se(3), and two equivalent Se(5) atoms. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to one Se(2), one Se(3), two equivalent Se(1), two equivalent Se(4), and two equivalent Se(5) atoms. Nd(1) is bonded to one Se(1), one Se(2), two equivalent Se(3), and two equivalent Se(4) atoms to form NdSe6 octahedra that share edges with two equivalent Nd(1)Se6 octahedra and edges with two equivalent Ga(1)Se4 tetrahedra. Ga(1) is bonded to one Se(1), one Se(2), one Se(3), and one Se(5) atom to form GaSe4 tetrahedra that share edges with two equivalent Nd(1)Se6 octahedra. There are five inequivalent Se sites. In the first Se site, Se(1) is bonded to one Ba(1), two equivalent Ba(2), one Nd(1), and one Ga(1) atom to form distorted SeBa3NdGa trigonal bipyramids that share corners with three equivalent Se(5)Ba4Ga square pyramids, corners with five equivalent Se(4)Ba3Nd2 trigonal bipyramids, edges with two equivalent Se(5)Ba4Ga square pyramids,  an edgeedge with one Se(4)Ba3Nd2 trigonal bipyramid, and  an edgeedge with one Se(1)Ba3NdGa trigonal bipyramid. In the second Se site, Se(2) is bonded in a 5-coordinate geometry to one Ba(2), two equivalent Ba(1), one Nd(1), and one Ga(1) atom. In the third Se site, Se(3) is bonded in a 6-coordinate geometry to one Ba(2), two equivalent Ba(1), two equivalent Nd(1), and one Ga(1) atom. In the fourth Se site, Se(4) is bonded to one Ba(1), two equivalent Ba(2), and two equivalent Nd(1) atoms to form distorted SeBa3Nd2 trigonal bipyramids that share corners with four equivalent Se(5)Ba4Ga square pyramids, corners with five equivalent Se(1)Ba3NdGa trigonal bipyramids,  an edgeedge with one Se(5)Ba4Ga square pyramid,  an edgeedge with one Se(1)Ba3NdGa trigonal bipyramid, and edges with two equivalent Se(4)Ba3Nd2 trigonal bipyramids. In the fifth Se site, Se(5) is bonded to two equivalent Ba(1), two equivalent Ba(2), and one Ga(1) atom to form SeBa4Ga square pyramids that share corners with three equivalent Se(1)Ba3NdGa trigonal bipyramids, corners with four equivalent Se(4)Ba3Nd2 trigonal bipyramids, edges with two equivalent Se(5)Ba4Ga square pyramids,  an edgeedge with one Se(4)Ba3Nd2 trigonal bipyramid, and edges with two equivalent Se(1)Ba3NdGa trigonal bipyramids. is represented by the CIF card [CIF]
data_Ba2NdGaSe5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.438
_cell_length_b   8.942
_cell_length_c   9.650
_cell_angle_alpha   103.789
_cell_angle_beta   102.899
_cell_angle_gamma   107.669
_symmetry_Int_Tables_number   1
_cell_volume   562.841
_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  0.635  0.979  0.295  1.0
  Ba  Ba1  1  0.365  0.021  0.705  1.0
  Ba  Ba2  1  0.338  0.509  0.704  1.0
  Ba  Ba3  1  0.662  0.491  0.296  1.0
  Nd  Nd4  1  0.997  0.732  0.997  1.0
  Nd  Nd5  1  0.003  0.268  0.003  1.0
  Ga  Ga6  1  0.804  0.871  0.686  1.0
  Ga  Ga7  1  0.196  0.129  0.314  1.0
  Se  Se8  1  0.988  0.687  0.679  1.0
  Se  Se9  1  0.012  0.313  0.321  1.0
  Se  Se10  1  0.982  0.147  0.683  1.0
  Se  Se11  1  0.018  0.853  0.317  1.0
  Se  Se12  1  0.704  0.905  0.920  1.0
  Se  Se13  1  0.296  0.095  0.080  1.0
  Se  Se14  1  0.698  0.408  0.945  1.0
  Se  Se15  1  0.302  0.592  0.055  1.0
  Se  Se16  1  0.488  0.739  0.492  1.0
  Se  Se17  1  0.512  0.261  0.508  1.0
[/CIF]
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The crystal structure described by Ba2NdGaSe5 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 8-coordinate geometry to one Se(1), one Se(4), two equivalent Se(2), two equivalent Se(3), and two equivalent Se(5) atoms. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to one Se(2), one Se(3), two equivalent Se(1), two equivalent Se(4), and two equivalent Se(5) atoms. Nd(1) is bonded to one Se(1), one Se(2), two equivalent Se(3), and two equivalent Se(4) atoms to form NdSe6 octahedra that share edges with two equivalent Nd(1)Se6 octahedra and edges with two equivalent Ga(1)Se4 tetrahedra. Ga(1) is bonded to one Se(1), one Se(2), one Se(3), and one Se(5) atom to form GaSe4 tetrahedra that share edges with two equivalent Nd(1)Se6 octahedra. There are five inequivalent Se sites. In the first Se site, Se(1) is bonded to one Ba(1), two equivalent Ba(2), one Nd(1), and one Ga(1) atom to form distorted SeBa3NdGa trigonal bipyramids that share corners with three equivalent Se(5)Ba4Ga square pyramids, corners with five equivalent Se(4)Ba3Nd2 trigonal bipyramids, edges with two equivalent Se(5)Ba4Ga square pyramids,  an edgeedge with one Se(4)Ba3Nd2 trigonal bipyramid, and  an edgeedge with one Se(1)Ba3NdGa trigonal bipyramid. In the second Se site, Se(2) is bonded in a 5-coordinate geometry to one Ba(2), two equivalent Ba(1), one Nd(1), and one Ga(1) atom. In the third Se site, Se(3) is bonded in a 6-coordinate geometry to one Ba(2), two equivalent Ba(1), two equivalent Nd(1), and one Ga(1) atom. In the fourth Se site, Se(4) is bonded to one Ba(1), two equivalent Ba(2), and two equivalent Nd(1) atoms to form distorted SeBa3Nd2 trigonal bipyramids that share corners with four equivalent Se(5)Ba4Ga square pyramids, corners with five equivalent Se(1)Ba3NdGa trigonal bipyramids,  an edgeedge with one Se(5)Ba4Ga square pyramid,  an edgeedge with one Se(1)Ba3NdGa trigonal bipyramid, and edges with two equivalent Se(4)Ba3Nd2 trigonal bipyramids. In the fifth Se site, Se(5) is bonded to two equivalent Ba(1), two equivalent Ba(2), and one Ga(1) atom to form SeBa4Ga square pyramids that share corners with three equivalent Se(1)Ba3NdGa trigonal bipyramids, corners with four equivalent Se(4)Ba3Nd2 trigonal bipyramids, edges with two equivalent Se(5)Ba4Ga square pyramids,  an edgeedge with one Se(4)Ba3Nd2 trigonal bipyramid, and edges with two equivalent Se(1)Ba3NdGa trigonal bipyramids. is represented by the CIF card [CIF]
data_Ba2NdGaSe5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.438
_cell_length_b   8.942
_cell_length_c   9.650
_cell_angle_alpha   103.789
_cell_angle_beta   102.899
_cell_angle_gamma   107.669
_symmetry_Int_Tables_number   1
_cell_volume   562.841
_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  0.635  0.979  0.295  1.0
  Ba  Ba1  1  0.365  0.021  0.705  1.0
  Ba  Ba2  1  0.338  0.509  0.704  1.0
  Ba  Ba3  1  0.662  0.491  0.296  1.0
  Nd  Nd4  1  0.997  0.732  0.997  1.0
  Nd  Nd5  1  0.003  0.268  0.003  1.0
  Ga  Ga6  1  0.804  0.871  0.686  1.0
  Ga  Ga7  1  0.196  0.129  0.314  1.0
  Se  Se8  1  0.988  0.687  0.679  1.0
  Se  Se9  1  0.012  0.313  0.321  1.0
  Se  Se10  1  0.982  0.147  0.683  1.0
  Se  Se11  1  0.018  0.853  0.317  1.0
  Se  Se12  1  0.704  0.905  0.920  1.0
  Se  Se13  1  0.296  0.095  0.080  1.0
  Se  Se14  1  0.698  0.408  0.945  1.0
  Se  Se15  1  0.302  0.592  0.055  1.0
  Se  Se16  1  0.488  0.739  0.492  1.0
  Se  Se17  1  0.512  0.261  0.508  1.0
[/CIF]
.