The crystal structure described by K2La2(BO3)2O crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(7), and two equivalent O(6) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(7) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(3), one O(4), and one O(5) atom. There are seven inequivalent O sites. In the first O site, O(3) is bonded in a distorted single-bond geometry to one La(2), two equivalent La(1), and one B(2) atom. In the second O site, O(4) is bonded in a distorted single-bond geometry to two equivalent K(1), two equivalent K(2), one La(2), and one B(2) atom. In the third O site, O(5) is bonded in a distorted single-bond geometry to one K(2), one La(2), two equivalent La(1), and one B(2) atom. In the fourth O site, O(6) is bonded to two equivalent La(1) and two equivalent La(2) atoms to form a mixture of corner and edge-sharing OLa4 tetrahedra. In the fifth O site, O(7) is bonded in a distorted single-bond geometry to one La(2), two equivalent La(1), and one B(1) atom. In the sixth O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(1), two equivalent K(2), one La(2), and one B(1) atom. In the seventh O site, O(2) is bonded in a distorted single-bond geometry to two equivalent K(1), two equivalent K(2), one La(2), and one B(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2La2B2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.733
_cell_length_b   10.916
_cell_length_c   11.505
_cell_angle_alpha   62.885
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   752.619
_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
  K  K0  1  0.062  0.265  0.968  1.0
  K  K1  1  0.562  0.235  0.032  1.0
  K  K2  1  0.938  0.735  0.032  1.0
  K  K3  1  0.438  0.765  0.968  1.0
  K  K4  1  0.245  0.445  0.118  1.0
  K  K5  1  0.745  0.055  0.882  1.0
  K  K6  1  0.755  0.555  0.882  1.0
  K  K7  1  0.255  0.945  0.118  1.0
  La  La8  1  0.546  0.180  0.519  1.0
  La  La9  1  0.046  0.320  0.481  1.0
  La  La10  1  0.454  0.820  0.481  1.0
  La  La11  1  0.954  0.680  0.519  1.0
  La  La12  1  0.918  0.085  0.322  1.0
  La  La13  1  0.418  0.415  0.678  1.0
  La  La14  1  0.082  0.915  0.678  1.0
  La  La15  1  0.582  0.585  0.322  1.0
  B  B16  1  0.747  0.412  0.195  1.0
  B  B17  1  0.247  0.088  0.805  1.0
  B  B18  1  0.253  0.588  0.805  1.0
  B  B19  1  0.753  0.912  0.195  1.0
  B  B20  1  0.346  0.146  0.304  1.0
  B  B21  1  0.846  0.354  0.696  1.0
  B  B22  1  0.654  0.854  0.696  1.0
  B  B23  1  0.154  0.646  0.304  1.0
  O  O24  1  0.650  0.536  0.122  1.0
  O  O25  1  0.150  0.964  0.878  1.0
  O  O26  1  0.350  0.464  0.878  1.0
  O  O27  1  0.850  0.036  0.122  1.0
  O  O28  1  0.847  0.338  0.142  1.0
  O  O29  1  0.347  0.162  0.858  1.0
  O  O30  1  0.153  0.662  0.858  1.0
  O  O31  1  0.653  0.838  0.142  1.0
  O  O32  1  0.533  0.088  0.351  1.0
  O  O33  1  0.033  0.412  0.649  1.0
  O  O34  1  0.467  0.912  0.649  1.0
  O  O35  1  0.967  0.588  0.351  1.0
  O  O36  1  0.254  0.141  0.199  1.0
  O  O37  1  0.754  0.359  0.801  1.0
  O  O38  1  0.746  0.859  0.801  1.0
  O  O39  1  0.246  0.641  0.199  1.0
  O  O40  1  0.748  0.287  0.634  1.0
  O  O41  1  0.248  0.213  0.366  1.0
  O  O42  1  0.252  0.713  0.366  1.0
  O  O43  1  0.752  0.787  0.634  1.0
  O  O44  1  0.880  0.098  0.527  1.0
  O  O45  1  0.380  0.402  0.473  1.0
  O  O46  1  0.120  0.902  0.473  1.0
  O  O47  1  0.620  0.598  0.527  1.0
  O  O48  1  0.743  0.361  0.333  1.0
  O  O49  1  0.243  0.139  0.667  1.0
  O  O50  1  0.257  0.639  0.667  1.0
  O  O51  1  0.757  0.861  0.333  1.0
[/CIF]
.
The crystal structure described by K2La2(BO3)2O crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(7), and two equivalent O(6) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(7) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(3), one O(4), and one O(5) atom. There are seven inequivalent O sites. In the first O site, O(3) is bonded in a distorted single-bond geometry to one La(2), two equivalent La(1), and one B(2) atom. In the second O site, O(4) is bonded in a distorted single-bond geometry to two equivalent K(1), two equivalent K(2), one La(2), and one B(2) atom. In the third O site, O(5) is bonded in a distorted single-bond geometry to one K(2), one La(2), two equivalent La(1), and one B(2) atom. In the fourth O site, O(6) is bonded to two equivalent La(1) and two equivalent La(2) atoms to form a mixture of corner and edge-sharing OLa4 tetrahedra. In the fifth O site, O(7) is bonded in a distorted single-bond geometry to one La(2), two equivalent La(1), and one B(1) atom. In the sixth O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(1), two equivalent K(2), one La(2), and one B(1) atom. In the seventh O site, O(2) is bonded in a distorted single-bond geometry to two equivalent K(1), two equivalent K(2), one La(2), and one B(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2La2B2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.733
_cell_length_b   10.916
_cell_length_c   11.505
_cell_angle_alpha   62.885
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   752.619
_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
  K  K0  1  0.062  0.265  0.968  1.0
  K  K1  1  0.562  0.235  0.032  1.0
  K  K2  1  0.938  0.735  0.032  1.0
  K  K3  1  0.438  0.765  0.968  1.0
  K  K4  1  0.245  0.445  0.118  1.0
  K  K5  1  0.745  0.055  0.882  1.0
  K  K6  1  0.755  0.555  0.882  1.0
  K  K7  1  0.255  0.945  0.118  1.0
  La  La8  1  0.546  0.180  0.519  1.0
  La  La9  1  0.046  0.320  0.481  1.0
  La  La10  1  0.454  0.820  0.481  1.0
  La  La11  1  0.954  0.680  0.519  1.0
  La  La12  1  0.918  0.085  0.322  1.0
  La  La13  1  0.418  0.415  0.678  1.0
  La  La14  1  0.082  0.915  0.678  1.0
  La  La15  1  0.582  0.585  0.322  1.0
  B  B16  1  0.747  0.412  0.195  1.0
  B  B17  1  0.247  0.088  0.805  1.0
  B  B18  1  0.253  0.588  0.805  1.0
  B  B19  1  0.753  0.912  0.195  1.0
  B  B20  1  0.346  0.146  0.304  1.0
  B  B21  1  0.846  0.354  0.696  1.0
  B  B22  1  0.654  0.854  0.696  1.0
  B  B23  1  0.154  0.646  0.304  1.0
  O  O24  1  0.650  0.536  0.122  1.0
  O  O25  1  0.150  0.964  0.878  1.0
  O  O26  1  0.350  0.464  0.878  1.0
  O  O27  1  0.850  0.036  0.122  1.0
  O  O28  1  0.847  0.338  0.142  1.0
  O  O29  1  0.347  0.162  0.858  1.0
  O  O30  1  0.153  0.662  0.858  1.0
  O  O31  1  0.653  0.838  0.142  1.0
  O  O32  1  0.533  0.088  0.351  1.0
  O  O33  1  0.033  0.412  0.649  1.0
  O  O34  1  0.467  0.912  0.649  1.0
  O  O35  1  0.967  0.588  0.351  1.0
  O  O36  1  0.254  0.141  0.199  1.0
  O  O37  1  0.754  0.359  0.801  1.0
  O  O38  1  0.746  0.859  0.801  1.0
  O  O39  1  0.246  0.641  0.199  1.0
  O  O40  1  0.748  0.287  0.634  1.0
  O  O41  1  0.248  0.213  0.366  1.0
  O  O42  1  0.252  0.713  0.366  1.0
  O  O43  1  0.752  0.787  0.634  1.0
  O  O44  1  0.880  0.098  0.527  1.0
  O  O45  1  0.380  0.402  0.473  1.0
  O  O46  1  0.120  0.902  0.473  1.0
  O  O47  1  0.620  0.598  0.527  1.0
  O  O48  1  0.743  0.361  0.333  1.0
  O  O49  1  0.243  0.139  0.667  1.0
  O  O50  1  0.257  0.639  0.667  1.0
  O  O51  1  0.757  0.861  0.333  1.0
[/CIF]
.