The structure described by LaNb2CuO7Br is Pb(Zr_(1-x)Ti_x)O3-derived structured and crystallizes in the orthorhombic Pbam space group. La(1) is bonded in a 12-coordinate geometry to two equivalent O(1), two equivalent O(2), four equivalent O(3), and four equivalent O(4) atoms. Nb(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(4), one O(5), and two equivalent O(3) atoms. Cu(1) is bonded in a 2-coordinate geometry to two equivalent O(5) and four equivalent Br(1) atoms. There are five inequivalent O sites. In the first O site, O(4) is bonded to four equivalent La(1) and two equivalent Nb(1) atoms to form distorted OLa4Nb2 trigonal pyramids that share corners with four equivalent O(1)La2Nb2 tetrahedra, corners with four equivalent O(4)La4Nb2 trigonal pyramids, corners with eight equivalent O(3)La2Nb2 trigonal pyramids, edges with four equivalent O(4)La4Nb2 trigonal pyramids, faces with two equivalent O(1)La2Nb2 tetrahedra, and faces with four equivalent O(3)La2Nb2 trigonal pyramids. In the second O site, O(5) is bonded in a linear geometry to one Nb(1) and one Cu(1) atom. In the third O site, O(1) is bonded to two equivalent La(1) and two equivalent Nb(1) atoms to form distorted OLa2Nb2 tetrahedra that share corners with four equivalent O(3)La2Nb2 trigonal pyramids, corners with four equivalent O(4)La4Nb2 trigonal pyramids,  an edgeedge with one O(1)La2Nb2 tetrahedra, edges with four equivalent O(3)La2Nb2 trigonal pyramids, and faces with two equivalent O(4)La4Nb2 trigonal pyramids. In the fourth O site, O(2) is bonded in a linear geometry to two equivalent La(1) and two equivalent Nb(1) atoms. In the fifth O site, O(3) is bonded to two equivalent La(1) and two equivalent Nb(1) atoms to form distorted OLa2Nb2 trigonal pyramids that share corners with two equivalent O(1)La2Nb2 tetrahedra, corners with four equivalent O(4)La4Nb2 trigonal pyramids, corners with six equivalent O(3)La2Nb2 trigonal pyramids, edges with two equivalent O(1)La2Nb2 tetrahedra,  an edgeedge with one O(3)La2Nb2 trigonal pyramid, and faces with two equivalent O(4)La4Nb2 trigonal pyramids. Br(1) is bonded in a distorted water-like geometry to four equivalent Cu(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_LaNb2CuBrO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.902
_cell_length_b   7.932
_cell_length_c   11.785
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   738.704
_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
  La  La0  1  0.000  0.237  0.000  1.0
  La  La1  1  1.000  0.763  0.000  1.0
  La  La2  1  0.500  0.263  0.000  1.0
  La  La3  1  0.500  0.737  0.000  1.0
  Nb  Nb4  1  0.752  0.500  0.189  1.0
  Nb  Nb5  1  0.248  0.500  0.189  1.0
  Nb  Nb6  1  0.252  1.000  0.811  1.0
  Nb  Nb7  1  0.748  0.000  0.811  1.0
  Nb  Nb8  1  0.248  0.500  0.811  1.0
  Nb  Nb9  1  0.752  0.500  0.811  1.0
  Nb  Nb10  1  0.748  0.000  0.189  1.0
  Nb  Nb11  1  0.252  1.000  0.189  1.0
  Cu  Cu12  1  0.772  0.495  0.500  1.0
  Cu  Cu13  1  0.228  0.505  0.500  1.0
  Cu  Cu14  1  0.272  0.005  0.500  1.0
  Cu  Cu15  1  0.728  0.995  0.500  1.0
  Br  Br16  1  0.944  0.229  0.500  1.0
  Br  Br17  1  0.056  0.771  0.500  1.0
  Br  Br18  1  0.444  0.271  0.500  1.0
  Br  Br19  1  0.556  0.729  0.500  1.0
  O  O20  1  0.000  0.500  0.134  1.0
  O  O21  1  0.500  0.000  0.866  1.0
  O  O22  1  0.000  0.500  0.866  1.0
  O  O23  1  0.500  0.000  0.134  1.0
  O  O24  1  0.500  0.500  0.182  1.0
  O  O25  1  0.000  0.000  0.818  1.0
  O  O26  1  0.500  0.500  0.818  1.0
  O  O27  1  0.000  0.000  0.182  1.0
  O  O28  1  0.750  0.250  0.151  1.0
  O  O29  1  0.250  0.750  0.151  1.0
  O  O30  1  0.250  0.250  0.849  1.0
  O  O31  1  0.750  0.750  0.849  1.0
  O  O32  1  0.250  0.750  0.849  1.0
  O  O33  1  0.750  0.250  0.849  1.0
  O  O34  1  0.750  0.750  0.151  1.0
  O  O35  1  0.250  0.250  0.151  1.0
  O  O36  1  0.699  0.500  0.000  1.0
  O  O37  1  0.301  0.500  0.000  1.0
  O  O38  1  0.199  0.000  0.000  1.0
  O  O39  1  0.801  1.000  0.000  1.0
  O  O40  1  0.779  0.500  0.341  1.0
  O  O41  1  0.221  0.500  0.341  1.0
  O  O42  1  0.279  0.000  0.659  1.0
  O  O43  1  0.721  1.000  0.659  1.0
  O  O44  1  0.221  0.500  0.659  1.0
  O  O45  1  0.779  0.500  0.659  1.0
  O  O46  1  0.721  1.000  0.341  1.0
  O  O47  1  0.279  0.000  0.341  1.0
[/CIF]
.
The structure described by LaNb2CuO7Br is Pb(Zr_(1-x)Ti_x)O3-derived structured and crystallizes in the orthorhombic Pbam space group. La(1) is bonded in a 12-coordinate geometry to two equivalent O(1), two equivalent O(2), four equivalent O(3), and four equivalent O(4) atoms. Nb(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(4), one O(5), and two equivalent O(3) atoms. Cu(1) is bonded in a 2-coordinate geometry to two equivalent O(5) and four equivalent Br(1) atoms. There are five inequivalent O sites. In the first O site, O(4) is bonded to four equivalent La(1) and two equivalent Nb(1) atoms to form distorted OLa4Nb2 trigonal pyramids that share corners with four equivalent O(1)La2Nb2 tetrahedra, corners with four equivalent O(4)La4Nb2 trigonal pyramids, corners with eight equivalent O(3)La2Nb2 trigonal pyramids, edges with four equivalent O(4)La4Nb2 trigonal pyramids, faces with two equivalent O(1)La2Nb2 tetrahedra, and faces with four equivalent O(3)La2Nb2 trigonal pyramids. In the second O site, O(5) is bonded in a linear geometry to one Nb(1) and one Cu(1) atom. In the third O site, O(1) is bonded to two equivalent La(1) and two equivalent Nb(1) atoms to form distorted OLa2Nb2 tetrahedra that share corners with four equivalent O(3)La2Nb2 trigonal pyramids, corners with four equivalent O(4)La4Nb2 trigonal pyramids,  an edgeedge with one O(1)La2Nb2 tetrahedra, edges with four equivalent O(3)La2Nb2 trigonal pyramids, and faces with two equivalent O(4)La4Nb2 trigonal pyramids. In the fourth O site, O(2) is bonded in a linear geometry to two equivalent La(1) and two equivalent Nb(1) atoms. In the fifth O site, O(3) is bonded to two equivalent La(1) and two equivalent Nb(1) atoms to form distorted OLa2Nb2 trigonal pyramids that share corners with two equivalent O(1)La2Nb2 tetrahedra, corners with four equivalent O(4)La4Nb2 trigonal pyramids, corners with six equivalent O(3)La2Nb2 trigonal pyramids, edges with two equivalent O(1)La2Nb2 tetrahedra,  an edgeedge with one O(3)La2Nb2 trigonal pyramid, and faces with two equivalent O(4)La4Nb2 trigonal pyramids. Br(1) is bonded in a distorted water-like geometry to four equivalent Cu(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_LaNb2CuBrO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.902
_cell_length_b   7.932
_cell_length_c   11.785
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   738.704
_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
  La  La0  1  0.000  0.237  0.000  1.0
  La  La1  1  1.000  0.763  0.000  1.0
  La  La2  1  0.500  0.263  0.000  1.0
  La  La3  1  0.500  0.737  0.000  1.0
  Nb  Nb4  1  0.752  0.500  0.189  1.0
  Nb  Nb5  1  0.248  0.500  0.189  1.0
  Nb  Nb6  1  0.252  1.000  0.811  1.0
  Nb  Nb7  1  0.748  0.000  0.811  1.0
  Nb  Nb8  1  0.248  0.500  0.811  1.0
  Nb  Nb9  1  0.752  0.500  0.811  1.0
  Nb  Nb10  1  0.748  0.000  0.189  1.0
  Nb  Nb11  1  0.252  1.000  0.189  1.0
  Cu  Cu12  1  0.772  0.495  0.500  1.0
  Cu  Cu13  1  0.228  0.505  0.500  1.0
  Cu  Cu14  1  0.272  0.005  0.500  1.0
  Cu  Cu15  1  0.728  0.995  0.500  1.0
  Br  Br16  1  0.944  0.229  0.500  1.0
  Br  Br17  1  0.056  0.771  0.500  1.0
  Br  Br18  1  0.444  0.271  0.500  1.0
  Br  Br19  1  0.556  0.729  0.500  1.0
  O  O20  1  0.000  0.500  0.134  1.0
  O  O21  1  0.500  0.000  0.866  1.0
  O  O22  1  0.000  0.500  0.866  1.0
  O  O23  1  0.500  0.000  0.134  1.0
  O  O24  1  0.500  0.500  0.182  1.0
  O  O25  1  0.000  0.000  0.818  1.0
  O  O26  1  0.500  0.500  0.818  1.0
  O  O27  1  0.000  0.000  0.182  1.0
  O  O28  1  0.750  0.250  0.151  1.0
  O  O29  1  0.250  0.750  0.151  1.0
  O  O30  1  0.250  0.250  0.849  1.0
  O  O31  1  0.750  0.750  0.849  1.0
  O  O32  1  0.250  0.750  0.849  1.0
  O  O33  1  0.750  0.250  0.849  1.0
  O  O34  1  0.750  0.750  0.151  1.0
  O  O35  1  0.250  0.250  0.151  1.0
  O  O36  1  0.699  0.500  0.000  1.0
  O  O37  1  0.301  0.500  0.000  1.0
  O  O38  1  0.199  0.000  0.000  1.0
  O  O39  1  0.801  1.000  0.000  1.0
  O  O40  1  0.779  0.500  0.341  1.0
  O  O41  1  0.221  0.500  0.341  1.0
  O  O42  1  0.279  0.000  0.659  1.0
  O  O43  1  0.721  1.000  0.659  1.0
  O  O44  1  0.221  0.500  0.659  1.0
  O  O45  1  0.779  0.500  0.659  1.0
  O  O46  1  0.721  1.000  0.341  1.0
  O  O47  1  0.279  0.000  0.341  1.0
[/CIF]
.