The material structure described by Li2Cu2Si4O11 is Chalcostibite-derived structured and crystallizes in the triclinic P-1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(5), and one O(7) atom. In the second Li site, Li(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(6), and one O(9) atom. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 6-coordinate geometry to one O(1), one O(7), one O(8), one O(9), and two equivalent O(11) atoms. In the second Cu site, Cu(2) is bonded in a 5-coordinate geometry to one O(11), one O(3), one O(7), one O(8), and one O(9) atom. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(10), one O(11), one O(4), and one O(5) atom to form corner-sharing SiO4 tetrahedra. In the third Si site, Si(3) is bonded to one O(2), one O(5), one O(6), and one O(8) atom to form corner-sharing SiO4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(10), one O(6), one O(7), and one O(9) atom to form corner-sharing SiO4 tetrahedra. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to one Li(1), one Li(2), one Cu(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Li(1), one Si(1), and one Si(3) atom. In the third O site, O(3) is bonded in a distorted trigonal pyramidal geometry to one Li(1), one Li(2), one Cu(2), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Li(2), one Si(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Li(1), one Si(2), and one Si(3) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Li(2), one Si(3), and one Si(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Li(1), one Cu(1), one Cu(2), and one Si(4) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Cu(1), one Cu(2), and one Si(3) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Li(2), one Cu(1), one Cu(2), and one Si(4) atom. In the tenth O site, O(10) is bonded in a distorted bent 120 degrees geometry to one Li(1), one Si(2), and one Si(4) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Cu(2), two equivalent Cu(1), and one Si(2) atom. is represented by the CIF file [CIF]
data_Li2Cu2Si4O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.101
_cell_length_b   7.677
_cell_length_c   8.561
_cell_angle_alpha   96.962
_cell_angle_beta   102.847
_cell_angle_gamma   109.852
_symmetry_Int_Tables_number   1
_cell_volume   418.024
_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
  Li  Li0  1  0.388  0.197  0.800  1.0
  Li  Li1  1  0.852  0.258  0.839  1.0
  Li  Li2  1  0.148  0.742  0.161  1.0
  Li  Li3  1  0.612  0.803  0.200  1.0
  Cu  Cu4  1  0.123  0.386  0.610  1.0
  Cu  Cu5  1  0.632  0.389  0.600  1.0
  Cu  Cu6  1  0.368  0.611  0.400  1.0
  Cu  Cu7  1  0.877  0.614  0.390  1.0
  Si  Si8  1  0.758  0.610  0.968  1.0
  Si  Si9  1  0.044  0.784  0.767  1.0
  Si  Si10  1  0.479  0.783  0.779  1.0
  Si  Si11  1  0.223  0.021  0.404  1.0
  Si  Si12  1  0.777  0.979  0.596  1.0
  Si  Si13  1  0.521  0.217  0.221  1.0
  Si  Si14  1  0.956  0.216  0.233  1.0
  Si  Si15  1  0.242  0.390  0.032  1.0
  O  O16  1  0.179  0.397  0.843  1.0
  O  O17  1  0.604  0.734  0.945  1.0
  O  O18  1  0.671  0.406  0.839  1.0
  O  O19  1  0.981  0.748  0.937  1.0
  O  O20  1  0.300  0.855  0.822  1.0
  O  O21  1  0.637  0.969  0.732  1.0
  O  O22  1  0.349  0.190  0.565  1.0
  O  O23  1  0.396  0.599  0.630  1.0
  O  O24  1  0.840  0.196  0.575  1.0
  O  O25  1  0.993  0.961  0.706  1.0
  O  O26  1  0.917  0.593  0.624  1.0
  O  O27  1  0.083  0.407  0.376  1.0
  O  O28  1  0.007  0.039  0.294  1.0
  O  O29  1  0.160  0.804  0.425  1.0
  O  O30  1  0.604  0.401  0.370  1.0
  O  O31  1  0.651  0.810  0.435  1.0
  O  O32  1  0.363  0.031  0.268  1.0
  O  O33  1  0.700  0.145  0.178  1.0
  O  O34  1  0.019  0.252  0.063  1.0
  O  O35  1  0.329  0.594  0.161  1.0
  O  O36  1  0.397  0.266  0.055  1.0
  O  O37  1  0.821  0.603  0.157  1.0
[/CIF]
.
The material structure described by Li2Cu2Si4O11 is Chalcostibite-derived structured and crystallizes in the triclinic P-1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(2), one O(3), one O(5), and one O(7) atom. In the second Li site, Li(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(6), and one O(9) atom. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 6-coordinate geometry to one O(1), one O(7), one O(8), one O(9), and two equivalent O(11) atoms. In the second Cu site, Cu(2) is bonded in a 5-coordinate geometry to one O(11), one O(3), one O(7), one O(8), and one O(9) atom. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(10), one O(11), one O(4), and one O(5) atom to form corner-sharing SiO4 tetrahedra. In the third Si site, Si(3) is bonded to one O(2), one O(5), one O(6), and one O(8) atom to form corner-sharing SiO4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(10), one O(6), one O(7), and one O(9) atom to form corner-sharing SiO4 tetrahedra. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to one Li(1), one Li(2), one Cu(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Li(1), one Si(1), and one Si(3) atom. In the third O site, O(3) is bonded in a distorted trigonal pyramidal geometry to one Li(1), one Li(2), one Cu(2), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Li(2), one Si(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Li(1), one Si(2), and one Si(3) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Li(2), one Si(3), and one Si(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Li(1), one Cu(1), one Cu(2), and one Si(4) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Cu(1), one Cu(2), and one Si(3) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Li(2), one Cu(1), one Cu(2), and one Si(4) atom. In the tenth O site, O(10) is bonded in a distorted bent 120 degrees geometry to one Li(1), one Si(2), and one Si(4) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Cu(2), two equivalent Cu(1), and one Si(2) atom. is represented by the CIF file [CIF]
data_Li2Cu2Si4O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.101
_cell_length_b   7.677
_cell_length_c   8.561
_cell_angle_alpha   96.962
_cell_angle_beta   102.847
_cell_angle_gamma   109.852
_symmetry_Int_Tables_number   1
_cell_volume   418.024
_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
  Li  Li0  1  0.388  0.197  0.800  1.0
  Li  Li1  1  0.852  0.258  0.839  1.0
  Li  Li2  1  0.148  0.742  0.161  1.0
  Li  Li3  1  0.612  0.803  0.200  1.0
  Cu  Cu4  1  0.123  0.386  0.610  1.0
  Cu  Cu5  1  0.632  0.389  0.600  1.0
  Cu  Cu6  1  0.368  0.611  0.400  1.0
  Cu  Cu7  1  0.877  0.614  0.390  1.0
  Si  Si8  1  0.758  0.610  0.968  1.0
  Si  Si9  1  0.044  0.784  0.767  1.0
  Si  Si10  1  0.479  0.783  0.779  1.0
  Si  Si11  1  0.223  0.021  0.404  1.0
  Si  Si12  1  0.777  0.979  0.596  1.0
  Si  Si13  1  0.521  0.217  0.221  1.0
  Si  Si14  1  0.956  0.216  0.233  1.0
  Si  Si15  1  0.242  0.390  0.032  1.0
  O  O16  1  0.179  0.397  0.843  1.0
  O  O17  1  0.604  0.734  0.945  1.0
  O  O18  1  0.671  0.406  0.839  1.0
  O  O19  1  0.981  0.748  0.937  1.0
  O  O20  1  0.300  0.855  0.822  1.0
  O  O21  1  0.637  0.969  0.732  1.0
  O  O22  1  0.349  0.190  0.565  1.0
  O  O23  1  0.396  0.599  0.630  1.0
  O  O24  1  0.840  0.196  0.575  1.0
  O  O25  1  0.993  0.961  0.706  1.0
  O  O26  1  0.917  0.593  0.624  1.0
  O  O27  1  0.083  0.407  0.376  1.0
  O  O28  1  0.007  0.039  0.294  1.0
  O  O29  1  0.160  0.804  0.425  1.0
  O  O30  1  0.604  0.401  0.370  1.0
  O  O31  1  0.651  0.810  0.435  1.0
  O  O32  1  0.363  0.031  0.268  1.0
  O  O33  1  0.700  0.145  0.178  1.0
  O  O34  1  0.019  0.252  0.063  1.0
  O  O35  1  0.329  0.594  0.161  1.0
  O  O36  1  0.397  0.266  0.055  1.0
  O  O37  1  0.821  0.603  0.157  1.0
[/CIF]
.