The compound described by Li2Si2O5 crystallizes in the orthorhombic Ccc2 space group. Li(1) is bonded to one O(3) and three equivalent O(1) atoms to form LiO4 tetrahedra that share corners with four equivalent Li(1)O4 tetrahedra, corners with five equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Li(1)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form SiO4 tetrahedra that share corners with three equivalent Si(1)O4 tetrahedra and corners with five equivalent Li(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Li(1) and one Si(1) atom to form a mixture of distorted edge and corner-sharing OLi3Si tetrahedra. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the third O site, O(3) is bonded in a trigonal planar geometry to one Li(1) and two equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_Li2Si2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.769
_cell_length_b   5.791
_cell_length_c   7.860
_cell_angle_alpha   111.616
_cell_angle_beta   89.997
_cell_angle_gamma   90.009
_symmetry_Int_Tables_number   1
_cell_volume   201.806
_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  0.595  0.705  0.115  1.0
  Li  Li1  1  0.095  0.591  0.885  1.0
  Li  Li2  1  0.095  0.402  0.114  1.0
  Li  Li3  1  0.595  0.288  0.886  1.0
  Si  Si4  1  0.095  0.989  0.295  1.0
  Si  Si5  1  0.095  0.005  0.704  1.0
  Si  Si6  1  0.595  0.301  0.296  1.0
  Si  Si7  1  0.595  0.693  0.705  1.0
  O  O8  1  0.498  0.399  0.142  1.0
  O  O9  1  0.998  0.257  0.858  1.0
  O  O10  1  0.536  0.497  0.500  1.0
  O  O11  1  0.498  0.594  0.858  1.0
  O  O12  1  0.036  0.997  0.500  1.0
  O  O13  1  0.931  0.765  0.726  1.0
  O  O14  1  0.431  0.039  0.274  1.0
  O  O15  1  0.431  0.955  0.726  1.0
  O  O16  1  0.931  0.229  0.274  1.0
  O  O17  1  0.998  0.736  0.142  1.0
[/CIF]
.
The compound described by Li2Si2O5 crystallizes in the orthorhombic Ccc2 space group. Li(1) is bonded to one O(3) and three equivalent O(1) atoms to form LiO4 tetrahedra that share corners with four equivalent Li(1)O4 tetrahedra, corners with five equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Li(1)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form SiO4 tetrahedra that share corners with three equivalent Si(1)O4 tetrahedra and corners with five equivalent Li(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Li(1) and one Si(1) atom to form a mixture of distorted edge and corner-sharing OLi3Si tetrahedra. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the third O site, O(3) is bonded in a trigonal planar geometry to one Li(1) and two equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_Li2Si2O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.769
_cell_length_b   5.791
_cell_length_c   7.860
_cell_angle_alpha   111.616
_cell_angle_beta   89.997
_cell_angle_gamma   90.009
_symmetry_Int_Tables_number   1
_cell_volume   201.806
_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  0.595  0.705  0.115  1.0
  Li  Li1  1  0.095  0.591  0.885  1.0
  Li  Li2  1  0.095  0.402  0.114  1.0
  Li  Li3  1  0.595  0.288  0.886  1.0
  Si  Si4  1  0.095  0.989  0.295  1.0
  Si  Si5  1  0.095  0.005  0.704  1.0
  Si  Si6  1  0.595  0.301  0.296  1.0
  Si  Si7  1  0.595  0.693  0.705  1.0
  O  O8  1  0.498  0.399  0.142  1.0
  O  O9  1  0.998  0.257  0.858  1.0
  O  O10  1  0.536  0.497  0.500  1.0
  O  O11  1  0.498  0.594  0.858  1.0
  O  O12  1  0.036  0.997  0.500  1.0
  O  O13  1  0.931  0.765  0.726  1.0
  O  O14  1  0.431  0.039  0.274  1.0
  O  O15  1  0.431  0.955  0.726  1.0
  O  O16  1  0.931  0.229  0.274  1.0
  O  O17  1  0.998  0.736  0.142  1.0
[/CIF]
.