The structure described by La2Bi2O7 crystallizes in the monoclinic P2_1 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(4), one O(6), one O(9), and two equivalent O(13) atoms. In the second La site, La(2) is bonded in a 7-coordinate geometry to one O(12), one O(3), one O(8), two equivalent O(2), and two equivalent O(5) atoms. In the third La site, La(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(13), one O(14), one O(6), one O(7), and one O(9) atom. In the fourth La site, La(4) is bonded in a 8-coordinate geometry to one O(10), one O(14), one O(2), one O(5), one O(7), one O(8), and two equivalent O(12) atoms. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(1), one O(10), one O(2), one O(3), one O(5), and one O(7) atom to form corner-sharing BiO6 octahedra. The corner-sharing octahedral tilt angles range from 37-50°. In the second Bi site, Bi(2) is bonded to one O(1), one O(11), one O(4), one O(7), and two equivalent O(6) atoms to form corner-sharing BiO6 octahedra. The corner-sharing octahedral tilt angles range from 36-51°. In the third Bi site, Bi(3) is bonded to one O(10), one O(12), one O(14), one O(3), one O(8), and one O(9) atom to form corner-sharing BiO6 octahedra. The corner-sharing octahedral tilt angles range from 37-51°. In the fourth Bi site, Bi(4) is bonded to one O(11), one O(14), one O(4), one O(9), and two equivalent O(13) atoms to form corner-sharing BiO6 octahedra. The corner-sharing octahedral tilt angles range from 33-51°. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one La(1), one La(3), one Bi(1), and one Bi(2) atom to form distorted OLa2Bi2 trigonal pyramids that share  a cornercorner with one O(11)La2Bi2 tetrahedra,  a cornercorner with one O(2)La3Bi tetrahedra,  a cornercorner with one O(5)La3Bi tetrahedra,  a cornercorner with one O(7)La2Bi2 trigonal pyramid, corners with two equivalent O(9)La2Bi2 trigonal pyramids,  an edgeedge with one O(11)La2Bi2 tetrahedra,  an edgeedge with one O(10)La2Bi2 trigonal pyramid, and  an edgeedge with one O(7)La2Bi2 trigonal pyramid. In the second O site, O(2) is bonded to one La(4), two equivalent La(2), and one Bi(1) atom to form distorted OLa3Bi tetrahedra that share corners with two equivalent O(12)La3Bi tetrahedra, corners with two equivalent O(2)La3Bi tetrahedra,  a cornercorner with one O(1)La2Bi2 trigonal pyramid, corners with two equivalent O(7)La2Bi2 trigonal pyramids,  an edgeedge with one O(12)La3Bi tetrahedra, edges with three equivalent O(5)La3Bi tetrahedra, and  an edgeedge with one O(10)La2Bi2 trigonal pyramid. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one La(2), one Bi(1), and one Bi(3) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one La(1), one Bi(2), and one Bi(4) atom. In the fifth O site, O(5) is bonded to one La(4), two equivalent La(2), and one Bi(1) atom to form distorted OLa3Bi tetrahedra that share corners with two equivalent O(5)La3Bi tetrahedra, corners with four equivalent O(12)La3Bi tetrahedra,  a cornercorner with one O(1)La2Bi2 trigonal pyramid, corners with two equivalent O(10)La2Bi2 trigonal pyramids, edges with three equivalent O(2)La3Bi tetrahedra, and  an edgeedge with one O(7)La2Bi2 trigonal pyramid. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one La(1), one La(3), and two equivalent Bi(2) atoms. In the seventh O site, O(7) is bonded to one La(3), one La(4), one Bi(1), and one Bi(2) atom to form distorted OLa2Bi2 trigonal pyramids that share corners with two equivalent O(11)La2Bi2 tetrahedra, corners with two equivalent O(12)La3Bi tetrahedra, corners with two equivalent O(2)La3Bi tetrahedra,  a cornercorner with one O(1)La2Bi2 trigonal pyramid,  a cornercorner with one O(10)La2Bi2 trigonal pyramid,  a cornercorner with one O(9)La2Bi2 trigonal pyramid,  an edgeedge with one O(5)La3Bi tetrahedra,  an edgeedge with one O(1)La2Bi2 trigonal pyramid, and  an edgeedge with one O(10)La2Bi2 trigonal pyramid. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one La(2), one La(4), and one Bi(3) atom. In the ninth O site, O(9) is bonded to one La(1), one La(3), one Bi(3), and one Bi(4) atom to form distorted OLa2Bi2 trigonal pyramids that share  a cornercorner with one O(11)La2Bi2 tetrahedra,  a cornercorner with one O(12)La3Bi tetrahedra,  a cornercorner with one O(7)La2Bi2 trigonal pyramid, corners with two equivalent O(1)La2Bi2 trigonal pyramids,  an edgeedge with one O(11)La2Bi2 tetrahedra, and  an edgeedge with one O(10)La2Bi2 trigonal pyramid. In the tenth O site, O(10) is bonded to one La(3), one La(4), one Bi(1), and one Bi(3) atom to form distorted OLa2Bi2 trigonal pyramids that share  a cornercorner with one O(11)La2Bi2 tetrahedra, corners with two equivalent O(5)La3Bi tetrahedra, corners with three equivalent O(12)La3Bi tetrahedra,  a cornercorner with one O(7)La2Bi2 trigonal pyramid,  an edgeedge with one O(2)La3Bi tetrahedra,  an edgeedge with one O(1)La2Bi2 trigonal pyramid,  an edgeedge with one O(7)La2Bi2 trigonal pyramid, and  an edgeedge with one O(9)La2Bi2 trigonal pyramid. In the eleventh O site, O(11) is bonded to one La(1), one La(3), one Bi(2), and one Bi(4) atom to form a mixture of distorted corner and edge-sharing OLa2Bi2 tetrahedra. In the twelfth O site, O(12) is bonded to one La(2), two equivalent La(4), and one Bi(3) atom to form distorted OLa3Bi tetrahedra that share corners with two equivalent O(12)La3Bi tetrahedra, corners with two equivalent O(2)La3Bi tetrahedra, corners with four equivalent O(5)La3Bi tetrahedra,  a cornercorner with one O(9)La2Bi2 trigonal pyramid, corners with two equivalent O(7)La2Bi2 trigonal pyramids, corners with three equivalent O(10)La2Bi2 trigonal pyramids, and  an edgeedge with one O(2)La3Bi tetrahedra. In the thirteenth O site, O(13) is bonded in a 5-coordinate geometry to one La(3), two equivalent La(1), and two equivalent Bi(4) atoms. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one La(3), one La(4), one Bi(3), and one Bi(4) atom. is represented by the CIF file [CIF]
data_La2Bi2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.960
_cell_length_b   8.442
_cell_length_c   14.315
_cell_angle_alpha   81.417
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   712.217
_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  0.774  0.763  0.921  1.0
  La  La1  1  0.333  0.857  0.565  1.0
  La  La2  1  0.251  0.715  0.125  1.0
  La  La3  1  0.783  0.645  0.389  1.0
  La  La4  1  0.283  0.355  0.611  1.0
  La  La5  1  0.751  0.285  0.875  1.0
  La  La6  1  0.833  0.143  0.435  1.0
  La  La7  1  0.274  0.237  0.079  1.0
  Bi  Bi8  1  0.269  0.922  0.318  1.0
  Bi  Bi9  1  0.767  0.974  0.118  1.0
  Bi  Bi10  1  0.780  0.586  0.675  1.0
  Bi  Bi11  1  0.267  0.532  0.877  1.0
  Bi  Bi12  1  0.767  0.468  0.123  1.0
  Bi  Bi13  1  0.280  0.414  0.325  1.0
  Bi  Bi14  1  0.267  0.026  0.882  1.0
  Bi  Bi15  1  0.769  0.078  0.682  1.0
  O  O16  1  0.398  0.992  0.180  1.0
  O  O17  1  0.551  0.928  0.410  1.0
  O  O18  1  0.657  0.832  0.679  1.0
  O  O19  1  0.397  0.775  0.885  1.0
  O  O20  1  0.056  0.866  0.438  1.0
  O  O21  1  0.053  0.920  0.018  1.0
  O  O22  1  0.985  0.840  0.247  1.0
  O  O23  1  0.101  0.628  0.616  1.0
  O  O24  1  0.901  0.578  0.819  1.0
  O  O25  1  0.416  0.677  0.308  1.0
  O  O26  1  0.628  0.732  0.079  1.0
  O  O27  1  0.582  0.598  0.547  1.0
  O  O28  1  0.559  0.438  0.982  1.0
  O  O29  1  0.491  0.484  0.748  1.0
  O  O30  1  0.991  0.516  0.252  1.0
  O  O31  1  0.059  0.562  0.018  1.0
  O  O32  1  0.082  0.402  0.453  1.0
  O  O33  1  0.128  0.268  0.921  1.0
  O  O34  1  0.916  0.323  0.692  1.0
  O  O35  1  0.401  0.422  0.181  1.0
  O  O36  1  0.601  0.372  0.384  1.0
  O  O37  1  0.485  0.160  0.753  1.0
  O  O38  1  0.553  0.080  0.982  1.0
  O  O39  1  0.556  0.134  0.562  1.0
  O  O40  1  0.897  0.225  0.115  1.0
  O  O41  1  0.157  0.168  0.321  1.0
  O  O42  1  0.051  0.072  0.590  1.0
  O  O43  1  0.898  0.008  0.820  1.0
[/CIF]
.
The structure described by La2Bi2O7 crystallizes in the monoclinic P2_1 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 6-coordinate geometry to one O(1), one O(11), one O(4), one O(6), one O(9), and two equivalent O(13) atoms. In the second La site, La(2) is bonded in a 7-coordinate geometry to one O(12), one O(3), one O(8), two equivalent O(2), and two equivalent O(5) atoms. In the third La site, La(3) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(13), one O(14), one O(6), one O(7), and one O(9) atom. In the fourth La site, La(4) is bonded in a 8-coordinate geometry to one O(10), one O(14), one O(2), one O(5), one O(7), one O(8), and two equivalent O(12) atoms. There are four inequivalent Bi sites. In the first Bi site, Bi(1) is bonded to one O(1), one O(10), one O(2), one O(3), one O(5), and one O(7) atom to form corner-sharing BiO6 octahedra. The corner-sharing octahedral tilt angles range from 37-50°. In the second Bi site, Bi(2) is bonded to one O(1), one O(11), one O(4), one O(7), and two equivalent O(6) atoms to form corner-sharing BiO6 octahedra. The corner-sharing octahedral tilt angles range from 36-51°. In the third Bi site, Bi(3) is bonded to one O(10), one O(12), one O(14), one O(3), one O(8), and one O(9) atom to form corner-sharing BiO6 octahedra. The corner-sharing octahedral tilt angles range from 37-51°. In the fourth Bi site, Bi(4) is bonded to one O(11), one O(14), one O(4), one O(9), and two equivalent O(13) atoms to form corner-sharing BiO6 octahedra. The corner-sharing octahedral tilt angles range from 33-51°. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one La(1), one La(3), one Bi(1), and one Bi(2) atom to form distorted OLa2Bi2 trigonal pyramids that share  a cornercorner with one O(11)La2Bi2 tetrahedra,  a cornercorner with one O(2)La3Bi tetrahedra,  a cornercorner with one O(5)La3Bi tetrahedra,  a cornercorner with one O(7)La2Bi2 trigonal pyramid, corners with two equivalent O(9)La2Bi2 trigonal pyramids,  an edgeedge with one O(11)La2Bi2 tetrahedra,  an edgeedge with one O(10)La2Bi2 trigonal pyramid, and  an edgeedge with one O(7)La2Bi2 trigonal pyramid. In the second O site, O(2) is bonded to one La(4), two equivalent La(2), and one Bi(1) atom to form distorted OLa3Bi tetrahedra that share corners with two equivalent O(12)La3Bi tetrahedra, corners with two equivalent O(2)La3Bi tetrahedra,  a cornercorner with one O(1)La2Bi2 trigonal pyramid, corners with two equivalent O(7)La2Bi2 trigonal pyramids,  an edgeedge with one O(12)La3Bi tetrahedra, edges with three equivalent O(5)La3Bi tetrahedra, and  an edgeedge with one O(10)La2Bi2 trigonal pyramid. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one La(2), one Bi(1), and one Bi(3) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one La(1), one Bi(2), and one Bi(4) atom. In the fifth O site, O(5) is bonded to one La(4), two equivalent La(2), and one Bi(1) atom to form distorted OLa3Bi tetrahedra that share corners with two equivalent O(5)La3Bi tetrahedra, corners with four equivalent O(12)La3Bi tetrahedra,  a cornercorner with one O(1)La2Bi2 trigonal pyramid, corners with two equivalent O(10)La2Bi2 trigonal pyramids, edges with three equivalent O(2)La3Bi tetrahedra, and  an edgeedge with one O(7)La2Bi2 trigonal pyramid. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one La(1), one La(3), and two equivalent Bi(2) atoms. In the seventh O site, O(7) is bonded to one La(3), one La(4), one Bi(1), and one Bi(2) atom to form distorted OLa2Bi2 trigonal pyramids that share corners with two equivalent O(11)La2Bi2 tetrahedra, corners with two equivalent O(12)La3Bi tetrahedra, corners with two equivalent O(2)La3Bi tetrahedra,  a cornercorner with one O(1)La2Bi2 trigonal pyramid,  a cornercorner with one O(10)La2Bi2 trigonal pyramid,  a cornercorner with one O(9)La2Bi2 trigonal pyramid,  an edgeedge with one O(5)La3Bi tetrahedra,  an edgeedge with one O(1)La2Bi2 trigonal pyramid, and  an edgeedge with one O(10)La2Bi2 trigonal pyramid. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one La(2), one La(4), and one Bi(3) atom. In the ninth O site, O(9) is bonded to one La(1), one La(3), one Bi(3), and one Bi(4) atom to form distorted OLa2Bi2 trigonal pyramids that share  a cornercorner with one O(11)La2Bi2 tetrahedra,  a cornercorner with one O(12)La3Bi tetrahedra,  a cornercorner with one O(7)La2Bi2 trigonal pyramid, corners with two equivalent O(1)La2Bi2 trigonal pyramids,  an edgeedge with one O(11)La2Bi2 tetrahedra, and  an edgeedge with one O(10)La2Bi2 trigonal pyramid. In the tenth O site, O(10) is bonded to one La(3), one La(4), one Bi(1), and one Bi(3) atom to form distorted OLa2Bi2 trigonal pyramids that share  a cornercorner with one O(11)La2Bi2 tetrahedra, corners with two equivalent O(5)La3Bi tetrahedra, corners with three equivalent O(12)La3Bi tetrahedra,  a cornercorner with one O(7)La2Bi2 trigonal pyramid,  an edgeedge with one O(2)La3Bi tetrahedra,  an edgeedge with one O(1)La2Bi2 trigonal pyramid,  an edgeedge with one O(7)La2Bi2 trigonal pyramid, and  an edgeedge with one O(9)La2Bi2 trigonal pyramid. In the eleventh O site, O(11) is bonded to one La(1), one La(3), one Bi(2), and one Bi(4) atom to form a mixture of distorted corner and edge-sharing OLa2Bi2 tetrahedra. In the twelfth O site, O(12) is bonded to one La(2), two equivalent La(4), and one Bi(3) atom to form distorted OLa3Bi tetrahedra that share corners with two equivalent O(12)La3Bi tetrahedra, corners with two equivalent O(2)La3Bi tetrahedra, corners with four equivalent O(5)La3Bi tetrahedra,  a cornercorner with one O(9)La2Bi2 trigonal pyramid, corners with two equivalent O(7)La2Bi2 trigonal pyramids, corners with three equivalent O(10)La2Bi2 trigonal pyramids, and  an edgeedge with one O(2)La3Bi tetrahedra. In the thirteenth O site, O(13) is bonded in a 5-coordinate geometry to one La(3), two equivalent La(1), and two equivalent Bi(4) atoms. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one La(3), one La(4), one Bi(3), and one Bi(4) atom. is represented by the CIF file [CIF]
data_La2Bi2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.960
_cell_length_b   8.442
_cell_length_c   14.315
_cell_angle_alpha   81.417
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   712.217
_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  0.774  0.763  0.921  1.0
  La  La1  1  0.333  0.857  0.565  1.0
  La  La2  1  0.251  0.715  0.125  1.0
  La  La3  1  0.783  0.645  0.389  1.0
  La  La4  1  0.283  0.355  0.611  1.0
  La  La5  1  0.751  0.285  0.875  1.0
  La  La6  1  0.833  0.143  0.435  1.0
  La  La7  1  0.274  0.237  0.079  1.0
  Bi  Bi8  1  0.269  0.922  0.318  1.0
  Bi  Bi9  1  0.767  0.974  0.118  1.0
  Bi  Bi10  1  0.780  0.586  0.675  1.0
  Bi  Bi11  1  0.267  0.532  0.877  1.0
  Bi  Bi12  1  0.767  0.468  0.123  1.0
  Bi  Bi13  1  0.280  0.414  0.325  1.0
  Bi  Bi14  1  0.267  0.026  0.882  1.0
  Bi  Bi15  1  0.769  0.078  0.682  1.0
  O  O16  1  0.398  0.992  0.180  1.0
  O  O17  1  0.551  0.928  0.410  1.0
  O  O18  1  0.657  0.832  0.679  1.0
  O  O19  1  0.397  0.775  0.885  1.0
  O  O20  1  0.056  0.866  0.438  1.0
  O  O21  1  0.053  0.920  0.018  1.0
  O  O22  1  0.985  0.840  0.247  1.0
  O  O23  1  0.101  0.628  0.616  1.0
  O  O24  1  0.901  0.578  0.819  1.0
  O  O25  1  0.416  0.677  0.308  1.0
  O  O26  1  0.628  0.732  0.079  1.0
  O  O27  1  0.582  0.598  0.547  1.0
  O  O28  1  0.559  0.438  0.982  1.0
  O  O29  1  0.491  0.484  0.748  1.0
  O  O30  1  0.991  0.516  0.252  1.0
  O  O31  1  0.059  0.562  0.018  1.0
  O  O32  1  0.082  0.402  0.453  1.0
  O  O33  1  0.128  0.268  0.921  1.0
  O  O34  1  0.916  0.323  0.692  1.0
  O  O35  1  0.401  0.422  0.181  1.0
  O  O36  1  0.601  0.372  0.384  1.0
  O  O37  1  0.485  0.160  0.753  1.0
  O  O38  1  0.553  0.080  0.982  1.0
  O  O39  1  0.556  0.134  0.562  1.0
  O  O40  1  0.897  0.225  0.115  1.0
  O  O41  1  0.157  0.168  0.321  1.0
  O  O42  1  0.051  0.072  0.590  1.0
  O  O43  1  0.898  0.008  0.820  1.0
[/CIF]
.