The material structure described by Li3Fe2(SiO4)2 crystallizes in the monoclinic Pc space group. There are three inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form distorted LiO4 tetrahedra that share  a cornercorner with one Fe(2)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, corners with three equivalent Fe(1)O4 tetrahedra, and  an edgeedge with one Si(1)O4 tetrahedra. In the second Li site, Li(2) is bonded in a trigonal planar geometry to one O(4), one O(6), and one O(7) atom. In the third Li site, Li(3) is bonded in a distorted see-saw-like geometry to one O(1), one O(2), one O(3), and one O(8) atom. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(3), one O(4), and one O(8) atom to form FeO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra, corners with three equivalent Li(1)O4 tetrahedra, and corners with three equivalent Si(2)O4 tetrahedra. In the second Fe site, Fe(2) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form FeO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and corners with three equivalent Si(1)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(5), one O(7), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O4 tetrahedra, corners with three equivalent Fe(2)O4 tetrahedra, and  an edgeedge with one Li(1)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(2)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, and corners with three equivalent Fe(1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Li(1), one Li(3), one Fe(1), and one Si(2) atom to form a mixture of edge and corner-sharing OLi2FeSi tetrahedra. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Li(3), one Fe(2), and one Si(1) atom. In the third O site, O(3) is bonded to one Li(1), one Li(3), one Fe(1), and one Si(2) atom to form a mixture of edge and corner-sharing OLi2FeSi trigonal pyramids. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Li(2), one Fe(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 Fe(2), and one Si(1) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Li(2), one Fe(2), and one Si(2) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Li(2), one Fe(2), and one Si(1) atom. In the eighth O site, O(8) is bonded in a distorted see-saw-like geometry to one Li(1), one Li(3), one Fe(1), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li3Fe2(SiO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.468
_cell_length_b   8.337
_cell_length_c   8.657
_cell_angle_alpha   76.464
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   383.694
_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  0.845  0.963  0.932  1.0
  Li  Li1  1  0.328  0.550  0.646  1.0
  Li  Li2  1  0.155  0.963  0.432  1.0
  Li  Li3  1  0.674  0.048  0.599  1.0
  Li  Li4  1  0.672  0.550  0.146  1.0
  Li  Li5  1  0.326  0.048  0.099  1.0
  Fe  Fe6  1  0.318  0.857  0.798  1.0
  Fe  Fe7  1  0.824  0.380  0.622  1.0
  Fe  Fe8  1  0.682  0.857  0.298  1.0
  Fe  Fe9  1  0.176  0.380  0.122  1.0
  Si  Si10  1  0.681  0.243  0.994  1.0
  Si  Si11  1  0.834  0.746  0.668  1.0
  Si  Si12  1  0.319  0.243  0.494  1.0
  Si  Si13  1  0.166  0.746  0.168  1.0
  O  O14  1  0.175  0.889  0.998  1.0
  O  O15  1  0.387  0.294  0.987  1.0
  O  O16  1  0.697  0.839  0.792  1.0
  O  O17  1  0.117  0.696  0.715  1.0
  O  O18  1  0.783  0.224  0.819  1.0
  O  O19  1  0.682  0.581  0.646  1.0
  O  O20  1  0.825  0.889  0.498  1.0
  O  O21  1  0.160  0.381  0.561  1.0
  O  O22  1  0.307  0.055  0.602  1.0
  O  O23  1  0.613  0.294  0.487  1.0
  O  O24  1  0.303  0.839  0.292  1.0
  O  O25  1  0.883  0.696  0.215  1.0
  O  O26  1  0.217  0.224  0.319  1.0
  O  O27  1  0.318  0.581  0.146  1.0
  O  O28  1  0.840  0.381  0.061  1.0
  O  O29  1  0.693  0.055  0.102  1.0
[/CIF]
.
The material structure described by Li3Fe2(SiO4)2 crystallizes in the monoclinic Pc space group. There are three inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form distorted LiO4 tetrahedra that share  a cornercorner with one Fe(2)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, corners with three equivalent Fe(1)O4 tetrahedra, and  an edgeedge with one Si(1)O4 tetrahedra. In the second Li site, Li(2) is bonded in a trigonal planar geometry to one O(4), one O(6), and one O(7) atom. In the third Li site, Li(3) is bonded in a distorted see-saw-like geometry to one O(1), one O(2), one O(3), and one O(8) atom. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(3), one O(4), and one O(8) atom to form FeO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra, corners with three equivalent Li(1)O4 tetrahedra, and corners with three equivalent Si(2)O4 tetrahedra. In the second Fe site, Fe(2) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form FeO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, and corners with three equivalent Si(1)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(5), one O(7), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O4 tetrahedra, corners with three equivalent Fe(2)O4 tetrahedra, and  an edgeedge with one Li(1)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(2)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, and corners with three equivalent Fe(1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Li(1), one Li(3), one Fe(1), and one Si(2) atom to form a mixture of edge and corner-sharing OLi2FeSi tetrahedra. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Li(3), one Fe(2), and one Si(1) atom. In the third O site, O(3) is bonded to one Li(1), one Li(3), one Fe(1), and one Si(2) atom to form a mixture of edge and corner-sharing OLi2FeSi trigonal pyramids. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Li(2), one Fe(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 Fe(2), and one Si(1) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Li(2), one Fe(2), and one Si(2) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Li(2), one Fe(2), and one Si(1) atom. In the eighth O site, O(8) is bonded in a distorted see-saw-like geometry to one Li(1), one Li(3), one Fe(1), and one Si(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li3Fe2(SiO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.468
_cell_length_b   8.337
_cell_length_c   8.657
_cell_angle_alpha   76.464
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   383.694
_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  0.845  0.963  0.932  1.0
  Li  Li1  1  0.328  0.550  0.646  1.0
  Li  Li2  1  0.155  0.963  0.432  1.0
  Li  Li3  1  0.674  0.048  0.599  1.0
  Li  Li4  1  0.672  0.550  0.146  1.0
  Li  Li5  1  0.326  0.048  0.099  1.0
  Fe  Fe6  1  0.318  0.857  0.798  1.0
  Fe  Fe7  1  0.824  0.380  0.622  1.0
  Fe  Fe8  1  0.682  0.857  0.298  1.0
  Fe  Fe9  1  0.176  0.380  0.122  1.0
  Si  Si10  1  0.681  0.243  0.994  1.0
  Si  Si11  1  0.834  0.746  0.668  1.0
  Si  Si12  1  0.319  0.243  0.494  1.0
  Si  Si13  1  0.166  0.746  0.168  1.0
  O  O14  1  0.175  0.889  0.998  1.0
  O  O15  1  0.387  0.294  0.987  1.0
  O  O16  1  0.697  0.839  0.792  1.0
  O  O17  1  0.117  0.696  0.715  1.0
  O  O18  1  0.783  0.224  0.819  1.0
  O  O19  1  0.682  0.581  0.646  1.0
  O  O20  1  0.825  0.889  0.498  1.0
  O  O21  1  0.160  0.381  0.561  1.0
  O  O22  1  0.307  0.055  0.602  1.0
  O  O23  1  0.613  0.294  0.487  1.0
  O  O24  1  0.303  0.839  0.292  1.0
  O  O25  1  0.883  0.696  0.215  1.0
  O  O26  1  0.217  0.224  0.319  1.0
  O  O27  1  0.318  0.581  0.146  1.0
  O  O28  1  0.840  0.381  0.061  1.0
  O  O29  1  0.693  0.055  0.102  1.0
[/CIF]
.