The material structure described by Na2Y2B2O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(2), one O(4), one O(7), and two equivalent O(1) atoms. In the second Na site, Na(2) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(7) atoms to form distorted face-sharing NaO6 octahedra. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. In the second Y site, Y(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), one O(7), and two equivalent O(3) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(2), one O(4), and one O(6) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(5), and one O(7) atom. There are seven inequivalent O sites. In the first O site, O(3) is bonded to two equivalent Y(1) and two equivalent Y(2) atoms to form a mixture of edge and corner-sharing OY4 tetrahedra. In the second O site, O(4) is bonded in a distorted single-bond geometry to one Na(1), two equivalent Na(2), one Y(2), and one B(1) atom. In the third O site, O(5) is bonded in a distorted single-bond geometry to one Y(2), two equivalent Y(1), and one B(2) atom. In the fourth O site, O(6) is bonded in a distorted single-bond geometry to one Y(2), two equivalent Y(1), and one B(1) atom. In the fifth O site, O(7) is bonded in a distorted single-bond geometry to one Na(1), two equivalent Na(2), one Y(2), and one B(2) atom. In the sixth O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Na(1), two equivalent Na(2), one Y(2), and one B(2) atom. In the seventh O site, O(2) is bonded in a distorted single-bond geometry to one Na(1), one Y(2), two equivalent Y(1), and one B(1) atom. is represented by the CIF file [CIF]
data_Na2Y2B2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.296
_cell_length_b   10.357
_cell_length_c   10.679
_cell_angle_alpha   62.259
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   616.315
_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
  Na  Na0  1  0.770  0.451  0.611  1.0
  Na  Na1  1  0.270  0.049  0.389  1.0
  Na  Na2  1  0.230  0.549  0.389  1.0
  Na  Na3  1  0.730  0.951  0.611  1.0
  Na  Na4  1  0.443  0.240  0.524  1.0
  Na  Na5  1  0.943  0.260  0.476  1.0
  Na  Na6  1  0.557  0.760  0.476  1.0
  Na  Na7  1  0.057  0.740  0.524  1.0
  Y  Y8  1  0.959  0.317  0.985  1.0
  Y  Y9  1  0.459  0.183  0.015  1.0
  Y  Y10  1  0.041  0.683  0.015  1.0
  Y  Y11  1  0.541  0.817  0.985  1.0
  Y  Y12  1  0.582  0.414  0.183  1.0
  Y  Y13  1  0.082  0.086  0.817  1.0
  Y  Y14  1  0.418  0.586  0.817  1.0
  Y  Y15  1  0.918  0.914  0.183  1.0
  B  B16  1  0.153  0.352  0.208  1.0
  B  B17  1  0.653  0.148  0.792  1.0
  B  B18  1  0.847  0.648  0.792  1.0
  B  B19  1  0.347  0.852  0.208  1.0
  B  B20  1  0.753  0.581  0.315  1.0
  B  B21  1  0.253  0.919  0.685  1.0
  B  B22  1  0.247  0.419  0.685  1.0
  B  B23  1  0.747  0.081  0.315  1.0
  O  O24  1  0.648  0.165  0.367  1.0
  O  O25  1  0.148  0.335  0.633  1.0
  O  O26  1  0.352  0.835  0.633  1.0
  O  O27  1  0.852  0.665  0.367  1.0
  O  O28  1  0.756  0.229  0.849  1.0
  O  O29  1  0.256  0.271  0.151  1.0
  O  O30  1  0.244  0.771  0.151  1.0
  O  O31  1  0.744  0.729  0.849  1.0
  O  O32  1  0.876  0.902  0.975  1.0
  O  O33  1  0.376  0.598  0.025  1.0
  O  O34  1  0.124  0.098  0.025  1.0
  O  O35  1  0.624  0.402  0.975  1.0
  O  O36  1  0.253  0.867  0.315  1.0
  O  O37  1  0.753  0.633  0.685  1.0
  O  O38  1  0.747  0.133  0.685  1.0
  O  O39  1  0.247  0.367  0.315  1.0
  O  O40  1  0.737  0.633  0.167  1.0
  O  O41  1  0.237  0.867  0.833  1.0
  O  O42  1  0.263  0.367  0.833  1.0
  O  O43  1  0.763  0.133  0.167  1.0
  O  O44  1  0.542  0.914  0.149  1.0
  O  O45  1  0.042  0.586  0.851  1.0
  O  O46  1  0.458  0.086  0.851  1.0
  O  O47  1  0.958  0.414  0.149  1.0
  O  O48  1  0.831  0.945  0.398  1.0
  O  O49  1  0.331  0.555  0.602  1.0
  O  O50  1  0.169  0.055  0.602  1.0
  O  O51  1  0.669  0.445  0.398  1.0
[/CIF]
.
The material structure described by Na2Y2B2O7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(2), one O(4), one O(7), and two equivalent O(1) atoms. In the second Na site, Na(2) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(7) atoms to form distorted face-sharing NaO6 octahedra. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. In the second Y site, Y(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), one O(7), and two equivalent O(3) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(2), one O(4), and one O(6) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(5), and one O(7) atom. There are seven inequivalent O sites. In the first O site, O(3) is bonded to two equivalent Y(1) and two equivalent Y(2) atoms to form a mixture of edge and corner-sharing OY4 tetrahedra. In the second O site, O(4) is bonded in a distorted single-bond geometry to one Na(1), two equivalent Na(2), one Y(2), and one B(1) atom. In the third O site, O(5) is bonded in a distorted single-bond geometry to one Y(2), two equivalent Y(1), and one B(2) atom. In the fourth O site, O(6) is bonded in a distorted single-bond geometry to one Y(2), two equivalent Y(1), and one B(1) atom. In the fifth O site, O(7) is bonded in a distorted single-bond geometry to one Na(1), two equivalent Na(2), one Y(2), and one B(2) atom. In the sixth O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Na(1), two equivalent Na(2), one Y(2), and one B(2) atom. In the seventh O site, O(2) is bonded in a distorted single-bond geometry to one Na(1), one Y(2), two equivalent Y(1), and one B(1) atom. is represented by the CIF file [CIF]
data_Na2Y2B2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.296
_cell_length_b   10.357
_cell_length_c   10.679
_cell_angle_alpha   62.259
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   616.315
_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
  Na  Na0  1  0.770  0.451  0.611  1.0
  Na  Na1  1  0.270  0.049  0.389  1.0
  Na  Na2  1  0.230  0.549  0.389  1.0
  Na  Na3  1  0.730  0.951  0.611  1.0
  Na  Na4  1  0.443  0.240  0.524  1.0
  Na  Na5  1  0.943  0.260  0.476  1.0
  Na  Na6  1  0.557  0.760  0.476  1.0
  Na  Na7  1  0.057  0.740  0.524  1.0
  Y  Y8  1  0.959  0.317  0.985  1.0
  Y  Y9  1  0.459  0.183  0.015  1.0
  Y  Y10  1  0.041  0.683  0.015  1.0
  Y  Y11  1  0.541  0.817  0.985  1.0
  Y  Y12  1  0.582  0.414  0.183  1.0
  Y  Y13  1  0.082  0.086  0.817  1.0
  Y  Y14  1  0.418  0.586  0.817  1.0
  Y  Y15  1  0.918  0.914  0.183  1.0
  B  B16  1  0.153  0.352  0.208  1.0
  B  B17  1  0.653  0.148  0.792  1.0
  B  B18  1  0.847  0.648  0.792  1.0
  B  B19  1  0.347  0.852  0.208  1.0
  B  B20  1  0.753  0.581  0.315  1.0
  B  B21  1  0.253  0.919  0.685  1.0
  B  B22  1  0.247  0.419  0.685  1.0
  B  B23  1  0.747  0.081  0.315  1.0
  O  O24  1  0.648  0.165  0.367  1.0
  O  O25  1  0.148  0.335  0.633  1.0
  O  O26  1  0.352  0.835  0.633  1.0
  O  O27  1  0.852  0.665  0.367  1.0
  O  O28  1  0.756  0.229  0.849  1.0
  O  O29  1  0.256  0.271  0.151  1.0
  O  O30  1  0.244  0.771  0.151  1.0
  O  O31  1  0.744  0.729  0.849  1.0
  O  O32  1  0.876  0.902  0.975  1.0
  O  O33  1  0.376  0.598  0.025  1.0
  O  O34  1  0.124  0.098  0.025  1.0
  O  O35  1  0.624  0.402  0.975  1.0
  O  O36  1  0.253  0.867  0.315  1.0
  O  O37  1  0.753  0.633  0.685  1.0
  O  O38  1  0.747  0.133  0.685  1.0
  O  O39  1  0.247  0.367  0.315  1.0
  O  O40  1  0.737  0.633  0.167  1.0
  O  O41  1  0.237  0.867  0.833  1.0
  O  O42  1  0.263  0.367  0.833  1.0
  O  O43  1  0.763  0.133  0.167  1.0
  O  O44  1  0.542  0.914  0.149  1.0
  O  O45  1  0.042  0.586  0.851  1.0
  O  O46  1  0.458  0.086  0.851  1.0
  O  O47  1  0.958  0.414  0.149  1.0
  O  O48  1  0.831  0.945  0.398  1.0
  O  O49  1  0.331  0.555  0.602  1.0
  O  O50  1  0.169  0.055  0.602  1.0
  O  O51  1  0.669  0.445  0.398  1.0
[/CIF]
.