The crystal structure described by La3Si2O7Cl3 crystallizes in the monoclinic P2_1 space group. There are three inequivalent La sites. In the first La site, La(1) is bonded in a 10-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(7), one Cl(1), two equivalent Cl(2), and two equivalent Cl(3) atoms. In the second La site, La(2) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(7), one Cl(1), one Cl(3), and two equivalent Cl(2) atoms. In the third La site, La(3) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(6), one O(7), one Cl(3), and two equivalent Cl(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(3), one O(5), one O(6), and one O(7) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form corner-sharing SiO4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one La(1), one La(3), and one Si(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one Si(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one La(2), one La(3), and one Si(1) atom. In the fourth O site, O(4) is bonded to one La(1), one La(2), one La(3), and one Si(2) atom to form distorted corner-sharing OLa3Si tetrahedra. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one La(1), one La(2), one La(3), and one Si(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one La(3), one Si(1), and one Si(2) atom. In the seventh O site, O(7) is bonded to one La(1), one La(2), one La(3), and one Si(1) atom to form distorted corner-sharing OLa3Si tetrahedra. There are three inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a see-saw-like geometry to one La(1), one La(2), and two equivalent La(3) atoms. In the second Cl site, Cl(2) is bonded in a distorted see-saw-like geometry to two equivalent La(1) and two equivalent La(2) atoms. In the third Cl site, Cl(3) is bonded in a see-saw-like geometry to one La(2), one La(3), and two equivalent La(1) atoms. is represented by the CIF card [CIF]
data_La3Si2Cl3O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.238
_cell_length_b   5.408
_cell_length_c   7.967
_cell_angle_alpha   71.079
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   498.778
_cell_formula_units_Z   2
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  0.506  0.977  0.421  1.0
  La  La1  1  0.006  0.023  0.579  1.0
  La  La2  1  0.252  0.561  0.300  1.0
  La  La3  1  0.531  0.713  0.970  1.0
  La  La4  1  0.752  0.439  0.700  1.0
  La  La5  1  0.031  0.287  0.030  1.0
  Si  Si6  1  0.843  0.784  0.935  1.0
  Si  Si7  1  0.455  0.392  0.683  1.0
  Si  Si8  1  0.343  0.216  0.065  1.0
  Si  Si9  1  0.955  0.608  0.317  1.0
  Cl  Cl10  1  0.130  0.839  0.940  1.0
  Cl  Cl11  1  0.253  0.014  0.506  1.0
  Cl  Cl12  1  0.630  0.161  0.060  1.0
  Cl  Cl13  1  0.753  0.986  0.494  1.0
  Cl  Cl14  1  0.124  0.457  0.665  1.0
  Cl  Cl15  1  0.624  0.543  0.335  1.0
  O  O16  1  0.496  0.100  0.691  1.0
  O  O17  1  0.893  0.442  0.498  1.0
  O  O18  1  0.393  0.558  0.502  1.0
  O  O19  1  0.996  0.900  0.309  1.0
  O  O20  1  0.216  0.269  0.097  1.0
  O  O21  1  0.057  0.412  0.304  1.0
  O  O22  1  0.382  0.909  0.127  1.0
  O  O23  1  0.883  0.620  0.139  1.0
  O  O24  1  0.411  0.358  0.190  1.0
  O  O25  1  0.882  0.091  0.873  1.0
  O  O26  1  0.911  0.642  0.810  1.0
  O  O27  1  0.557  0.588  0.696  1.0
  O  O28  1  0.383  0.380  0.861  1.0
  O  O29  1  0.716  0.731  0.903  1.0
[/CIF]
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The crystal structure described by La3Si2O7Cl3 crystallizes in the monoclinic P2_1 space group. There are three inequivalent La sites. In the first La site, La(1) is bonded in a 10-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(7), one Cl(1), two equivalent Cl(2), and two equivalent Cl(3) atoms. In the second La site, La(2) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(7), one Cl(1), one Cl(3), and two equivalent Cl(2) atoms. In the third La site, La(3) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(6), one O(7), one Cl(3), and two equivalent Cl(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(3), one O(5), one O(6), and one O(7) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form corner-sharing SiO4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one La(1), one La(3), and one Si(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one La(1), one La(2), and one Si(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one La(2), one La(3), and one Si(1) atom. In the fourth O site, O(4) is bonded to one La(1), one La(2), one La(3), and one Si(2) atom to form distorted corner-sharing OLa3Si tetrahedra. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one La(1), one La(2), one La(3), and one Si(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one La(3), one Si(1), and one Si(2) atom. In the seventh O site, O(7) is bonded to one La(1), one La(2), one La(3), and one Si(1) atom to form distorted corner-sharing OLa3Si tetrahedra. There are three inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a see-saw-like geometry to one La(1), one La(2), and two equivalent La(3) atoms. In the second Cl site, Cl(2) is bonded in a distorted see-saw-like geometry to two equivalent La(1) and two equivalent La(2) atoms. In the third Cl site, Cl(3) is bonded in a see-saw-like geometry to one La(2), one La(3), and two equivalent La(1) atoms. is represented by the CIF card [CIF]
data_La3Si2Cl3O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.238
_cell_length_b   5.408
_cell_length_c   7.967
_cell_angle_alpha   71.079
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   498.778
_cell_formula_units_Z   2
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  0.506  0.977  0.421  1.0
  La  La1  1  0.006  0.023  0.579  1.0
  La  La2  1  0.252  0.561  0.300  1.0
  La  La3  1  0.531  0.713  0.970  1.0
  La  La4  1  0.752  0.439  0.700  1.0
  La  La5  1  0.031  0.287  0.030  1.0
  Si  Si6  1  0.843  0.784  0.935  1.0
  Si  Si7  1  0.455  0.392  0.683  1.0
  Si  Si8  1  0.343  0.216  0.065  1.0
  Si  Si9  1  0.955  0.608  0.317  1.0
  Cl  Cl10  1  0.130  0.839  0.940  1.0
  Cl  Cl11  1  0.253  0.014  0.506  1.0
  Cl  Cl12  1  0.630  0.161  0.060  1.0
  Cl  Cl13  1  0.753  0.986  0.494  1.0
  Cl  Cl14  1  0.124  0.457  0.665  1.0
  Cl  Cl15  1  0.624  0.543  0.335  1.0
  O  O16  1  0.496  0.100  0.691  1.0
  O  O17  1  0.893  0.442  0.498  1.0
  O  O18  1  0.393  0.558  0.502  1.0
  O  O19  1  0.996  0.900  0.309  1.0
  O  O20  1  0.216  0.269  0.097  1.0
  O  O21  1  0.057  0.412  0.304  1.0
  O  O22  1  0.382  0.909  0.127  1.0
  O  O23  1  0.883  0.620  0.139  1.0
  O  O24  1  0.411  0.358  0.190  1.0
  O  O25  1  0.882  0.091  0.873  1.0
  O  O26  1  0.911  0.642  0.810  1.0
  O  O27  1  0.557  0.588  0.696  1.0
  O  O28  1  0.383  0.380  0.861  1.0
  O  O29  1  0.716  0.731  0.903  1.0
[/CIF]
.