The compound described by Rb2B4O7 crystallizes in the triclinic P-1 space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 2-coordinate geometry to one O(11) and one O(5) atom. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to one O(11), one O(2), one O(3), one O(9), two equivalent O(10), and two equivalent O(4) atoms. In the third Rb site, Rb(3) is bonded in a 3-coordinate geometry to one O(1), one O(12), and one O(8) atom. In the fourth Rb site, Rb(4) is bonded in a 8-coordinate geometry to one O(1), one O(12), one O(14), one O(7), two equivalent O(13), and two equivalent O(6) atoms. There are eight inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(10), one O(3), and one O(9) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(11), one O(14), and one O(6) atom. In the third B site, B(3) is bonded in a trigonal planar geometry to one O(12), one O(4), and one O(8) atom. In the fourth B site, B(4) is bonded in a trigonal planar geometry to one O(13), one O(2), and one O(5) atom. In the fifth B site, B(5) is bonded to one O(5), one O(6), one O(7), and one O(9) atom to form corner-sharing BO4 tetrahedra. In the sixth B site, B(6) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing BO4 tetrahedra. In the seventh B site, B(7) is bonded to one O(1), one O(12), one O(13), and one O(14) atom to form corner-sharing BO4 tetrahedra. In the eighth B site, B(8) is bonded to one O(10), one O(11), one O(7), and one O(8) atom to form corner-sharing BO4 tetrahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted water-like geometry to one Rb(3), one Rb(4), one B(6), and one B(7) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Rb(2), one B(4), and one B(6) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Rb(2), one B(1), and one B(6) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to two equivalent Rb(2), one B(3), and one B(6) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one B(4), and one B(5) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to two equivalent Rb(4), one B(2), and one B(5) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Rb(4), one B(5), and one B(8) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Rb(3), one B(3), and one B(8) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Rb(2), one B(1), and one B(5) atom. In the tenth O site, O(10) is bonded in a distorted bent 120 degrees geometry to two equivalent Rb(2), one B(1), and one B(8) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one Rb(2), one B(2), and one B(8) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one Rb(3), one Rb(4), one B(3), and one B(7) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 120 degrees geometry to two equivalent Rb(4), one B(4), and one B(7) atom. In the fourteenth O site, O(14) is bonded in a 2-coordinate geometry to one Rb(4), one B(2), and one B(7) atom. is represented by the CIF card [CIF]
data_Rb2B4O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.655
_cell_length_b   9.851
_cell_length_c   10.640
_cell_angle_alpha   89.294
_cell_angle_beta   103.266
_cell_angle_gamma   101.203
_symmetry_Int_Tables_number   1
_cell_volume   665.659
_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
  Rb  Rb0  1  0.761  0.010  0.593  1.0
  Rb  Rb1  1  0.239  0.990  0.407  1.0
  Rb  Rb2  1  0.240  0.621  0.508  1.0
  Rb  Rb3  1  0.760  0.379  0.492  1.0
  Rb  Rb4  1  0.667  0.479  0.874  1.0
  Rb  Rb5  1  0.333  0.521  0.126  1.0
  Rb  Rb6  1  0.638  0.876  0.950  1.0
  Rb  Rb7  1  0.362  0.124  0.050  1.0
  B  B8  1  0.303  0.291  0.551  1.0
  B  B9  1  0.697  0.709  0.449  1.0
  B  B10  1  0.853  0.206  0.851  1.0
  B  B11  1  0.147  0.794  0.149  1.0
  B  B12  1  0.130  0.558  0.803  1.0
  B  B13  1  0.870  0.442  0.197  1.0
  B  B14  1  0.203  0.913  0.735  1.0
  B  B15  1  0.797  0.087  0.265  1.0
  B  B16  1  0.438  0.160  0.739  1.0
  B  B17  1  0.562  0.840  0.261  1.0
  B  B18  1  0.904  0.708  0.681  1.0
  B  B19  1  0.096  0.292  0.319  1.0
  B  B20  1  0.068  0.775  0.900  1.0
  B  B21  1  0.932  0.225  0.100  1.0
  B  B22  1  0.165  0.310  0.749  1.0
  B  B23  1  0.835  0.690  0.251  1.0
  O  O24  1  0.869  0.745  0.803  1.0
  O  O25  1  0.069  0.819  0.643  1.0
  O  O26  1  0.291  0.307  0.421  1.0
  O  O27  1  0.709  0.693  0.579  1.0
  O  O28  1  0.018  0.426  0.308  1.0
  O  O29  1  0.931  0.181  0.357  1.0
  O  O30  1  0.663  0.985  0.310  1.0
  O  O31  1  0.337  0.015  0.690  1.0
  O  O32  1  0.359  0.845  0.170  1.0
  O  O33  1  0.641  0.155  0.830  1.0
  O  O34  1  0.686  0.774  0.196  1.0
  O  O35  1  0.314  0.226  0.804  1.0
  O  O36  1  0.775  0.553  0.179  1.0
  O  O37  1  0.225  0.447  0.821  1.0
  O  O38  1  0.533  0.767  0.381  1.0
  O  O39  1  0.467  0.233  0.619  1.0
  O  O40  1  0.836  0.666  0.391  1.0
  O  O41  1  0.164  0.334  0.609  1.0
  O  O42  1  0.058  0.752  0.250  1.0
  O  O43  1  0.942  0.248  0.750  1.0
  O  O44  1  0.185  0.658  0.901  1.0
  O  O45  1  0.815  0.342  0.099  1.0
  O  O46  1  0.203  0.902  0.863  1.0
  O  O47  1  0.797  0.098  0.137  1.0
  O  O48  1  0.976  0.212  0.974  1.0
  O  O49  1  0.024  0.788  0.026  1.0
  O  O50  1  0.982  0.574  0.692  1.0
  O  O51  1  0.131  0.255  0.197  1.0
[/CIF]
.
The compound described by Rb2B4O7 crystallizes in the triclinic P-1 space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 2-coordinate geometry to one O(11) and one O(5) atom. In the second Rb site, Rb(2) is bonded in a 8-coordinate geometry to one O(11), one O(2), one O(3), one O(9), two equivalent O(10), and two equivalent O(4) atoms. In the third Rb site, Rb(3) is bonded in a 3-coordinate geometry to one O(1), one O(12), and one O(8) atom. In the fourth Rb site, Rb(4) is bonded in a 8-coordinate geometry to one O(1), one O(12), one O(14), one O(7), two equivalent O(13), and two equivalent O(6) atoms. There are eight inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(10), one O(3), and one O(9) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(11), one O(14), and one O(6) atom. In the third B site, B(3) is bonded in a trigonal planar geometry to one O(12), one O(4), and one O(8) atom. In the fourth B site, B(4) is bonded in a trigonal planar geometry to one O(13), one O(2), and one O(5) atom. In the fifth B site, B(5) is bonded to one O(5), one O(6), one O(7), and one O(9) atom to form corner-sharing BO4 tetrahedra. In the sixth B site, B(6) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing BO4 tetrahedra. In the seventh B site, B(7) is bonded to one O(1), one O(12), one O(13), and one O(14) atom to form corner-sharing BO4 tetrahedra. In the eighth B site, B(8) is bonded to one O(10), one O(11), one O(7), and one O(8) atom to form corner-sharing BO4 tetrahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted water-like geometry to one Rb(3), one Rb(4), one B(6), and one B(7) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Rb(2), one B(4), and one B(6) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Rb(2), one B(1), and one B(6) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to two equivalent Rb(2), one B(3), and one B(6) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one B(4), and one B(5) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to two equivalent Rb(4), one B(2), and one B(5) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Rb(4), one B(5), and one B(8) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Rb(3), one B(3), and one B(8) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Rb(2), one B(1), and one B(5) atom. In the tenth O site, O(10) is bonded in a distorted bent 120 degrees geometry to two equivalent Rb(2), one B(1), and one B(8) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one Rb(2), one B(2), and one B(8) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one Rb(3), one Rb(4), one B(3), and one B(7) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 120 degrees geometry to two equivalent Rb(4), one B(4), and one B(7) atom. In the fourteenth O site, O(14) is bonded in a 2-coordinate geometry to one Rb(4), one B(2), and one B(7) atom. is represented by the CIF card [CIF]
data_Rb2B4O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.655
_cell_length_b   9.851
_cell_length_c   10.640
_cell_angle_alpha   89.294
_cell_angle_beta   103.266
_cell_angle_gamma   101.203
_symmetry_Int_Tables_number   1
_cell_volume   665.659
_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
  Rb  Rb0  1  0.761  0.010  0.593  1.0
  Rb  Rb1  1  0.239  0.990  0.407  1.0
  Rb  Rb2  1  0.240  0.621  0.508  1.0
  Rb  Rb3  1  0.760  0.379  0.492  1.0
  Rb  Rb4  1  0.667  0.479  0.874  1.0
  Rb  Rb5  1  0.333  0.521  0.126  1.0
  Rb  Rb6  1  0.638  0.876  0.950  1.0
  Rb  Rb7  1  0.362  0.124  0.050  1.0
  B  B8  1  0.303  0.291  0.551  1.0
  B  B9  1  0.697  0.709  0.449  1.0
  B  B10  1  0.853  0.206  0.851  1.0
  B  B11  1  0.147  0.794  0.149  1.0
  B  B12  1  0.130  0.558  0.803  1.0
  B  B13  1  0.870  0.442  0.197  1.0
  B  B14  1  0.203  0.913  0.735  1.0
  B  B15  1  0.797  0.087  0.265  1.0
  B  B16  1  0.438  0.160  0.739  1.0
  B  B17  1  0.562  0.840  0.261  1.0
  B  B18  1  0.904  0.708  0.681  1.0
  B  B19  1  0.096  0.292  0.319  1.0
  B  B20  1  0.068  0.775  0.900  1.0
  B  B21  1  0.932  0.225  0.100  1.0
  B  B22  1  0.165  0.310  0.749  1.0
  B  B23  1  0.835  0.690  0.251  1.0
  O  O24  1  0.869  0.745  0.803  1.0
  O  O25  1  0.069  0.819  0.643  1.0
  O  O26  1  0.291  0.307  0.421  1.0
  O  O27  1  0.709  0.693  0.579  1.0
  O  O28  1  0.018  0.426  0.308  1.0
  O  O29  1  0.931  0.181  0.357  1.0
  O  O30  1  0.663  0.985  0.310  1.0
  O  O31  1  0.337  0.015  0.690  1.0
  O  O32  1  0.359  0.845  0.170  1.0
  O  O33  1  0.641  0.155  0.830  1.0
  O  O34  1  0.686  0.774  0.196  1.0
  O  O35  1  0.314  0.226  0.804  1.0
  O  O36  1  0.775  0.553  0.179  1.0
  O  O37  1  0.225  0.447  0.821  1.0
  O  O38  1  0.533  0.767  0.381  1.0
  O  O39  1  0.467  0.233  0.619  1.0
  O  O40  1  0.836  0.666  0.391  1.0
  O  O41  1  0.164  0.334  0.609  1.0
  O  O42  1  0.058  0.752  0.250  1.0
  O  O43  1  0.942  0.248  0.750  1.0
  O  O44  1  0.185  0.658  0.901  1.0
  O  O45  1  0.815  0.342  0.099  1.0
  O  O46  1  0.203  0.902  0.863  1.0
  O  O47  1  0.797  0.098  0.137  1.0
  O  O48  1  0.976  0.212  0.974  1.0
  O  O49  1  0.024  0.788  0.026  1.0
  O  O50  1  0.982  0.574  0.692  1.0
  O  O51  1  0.131  0.255  0.197  1.0
[/CIF]
.