The material described by Li4Fe2Si3O10 crystallizes in the monoclinic C2/c space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(3), one O(5), and two equivalent O(2) atoms to form LiO4 tetrahedra that share corners with four equivalent Si(1)O4 tetrahedra, corners with three equivalent Fe(1)O5 trigonal bipyramids,  an edgeedge with one Li(1)O4 tetrahedra, and  an edgeedge with one Fe(1)O5 trigonal bipyramid. In the second Li site, Li(2) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(4) atoms. Fe(1) is bonded to one O(1), one O(2), one O(3), and two equivalent O(5) atoms to form FeO5 trigonal bipyramids that share  a cornercorner with one Si(2)O4 tetrahedra, corners with three equivalent Li(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra,  an edgeedge with one Li(1)O4 tetrahedra, and  an edgeedge with one Fe(1)O5 trigonal bipyramid. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra, corners with four equivalent Li(1)O4 tetrahedra, and corners with four equivalent Fe(1)O5 trigonal bipyramids. In the second Si site, Si(2) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form SiO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra and corners with two equivalent Fe(1)O5 trigonal bipyramids. There are five inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Li(2), one Fe(1), and one Si(2) atom to form distorted OLi2FeSi trigonal pyramids that share  a cornercorner with one O(3)Li2FeSi tetrahedra, corners with two equivalent O(5)LiFe2Si tetrahedra, corners with three equivalent O(1)Li2FeSi trigonal pyramids, and  an edgeedge with one O(3)Li2FeSi tetrahedra. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Li(1), one Fe(1), and one Si(1) atom. In the third O site, O(3) is bonded to one Li(1), one Li(2), one Fe(1), and one Si(1) atom to form distorted OLi2FeSi tetrahedra that share corners with four equivalent O(5)LiFe2Si tetrahedra,  a cornercorner with one O(1)Li2FeSi trigonal pyramid, and  an edgeedge with one O(1)Li2FeSi trigonal pyramid. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Li(2), one Si(1), and one Si(2) atom. In the fifth O site, O(5) is bonded to one Li(1), two equivalent Fe(1), and one Si(1) atom to form distorted OLiFe2Si tetrahedra that share corners with four equivalent O(3)Li2FeSi tetrahedra, corners with two equivalent O(1)Li2FeSi trigonal pyramids, and  an edgeedge with one O(5)LiFe2Si tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li4Fe2Si3O10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.366
_cell_length_b   5.366
_cell_length_c   17.215
_cell_angle_alpha   81.848
_cell_angle_beta   81.848
_cell_angle_gamma   60.779
_symmetry_Int_Tables_number   1
_cell_volume   426.718
_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  0.827  0.683  0.948  1.0
  Li  Li1  1  0.577  0.794  0.772  1.0
  Li  Li2  1  0.683  0.827  0.448  1.0
  Li  Li3  1  0.794  0.577  0.272  1.0
  Li  Li4  1  0.206  0.423  0.728  1.0
  Li  Li5  1  0.317  0.173  0.552  1.0
  Li  Li6  1  0.423  0.206  0.228  1.0
  Li  Li7  1  0.173  0.317  0.052  1.0
  Fe  Fe8  1  0.197  0.012  0.916  1.0
  Fe  Fe9  1  0.012  0.197  0.416  1.0
  Fe  Fe10  1  0.988  0.803  0.584  1.0
  Fe  Fe11  1  0.803  0.988  0.084  1.0
  Si  Si12  1  0.661  0.467  0.599  1.0
  Si  Si13  1  0.886  0.114  0.750  1.0
  Si  Si14  1  0.533  0.339  0.901  1.0
  Si  Si15  1  0.467  0.661  0.099  1.0
  Si  Si16  1  0.114  0.886  0.250  1.0
  Si  Si17  1  0.339  0.533  0.401  1.0
  O  O18  1  0.918  0.837  0.713  1.0
  O  O19  1  0.837  0.918  0.213  1.0
  O  O20  1  0.619  0.784  0.565  1.0
  O  O21  1  0.557  0.636  0.890  1.0
  O  O22  1  0.781  0.409  0.688  1.0
  O  O23  1  0.784  0.080  0.953  1.0
  O  O24  1  0.920  0.216  0.547  1.0
  O  O25  1  0.784  0.619  0.065  1.0
  O  O26  1  0.636  0.557  0.390  1.0
  O  O27  1  0.591  0.219  0.812  1.0
  O  O28  1  0.409  0.781  0.188  1.0
  O  O29  1  0.364  0.443  0.610  1.0
  O  O30  1  0.216  0.381  0.935  1.0
  O  O31  1  0.080  0.784  0.453  1.0
  O  O32  1  0.216  0.920  0.047  1.0
  O  O33  1  0.219  0.591  0.312  1.0
  O  O34  1  0.443  0.364  0.110  1.0
  O  O35  1  0.381  0.216  0.435  1.0
  O  O36  1  0.163  0.082  0.787  1.0
  O  O37  1  0.082  0.163  0.287  1.0
[/CIF]
.
The material described by Li4Fe2Si3O10 crystallizes in the monoclinic C2/c space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(3), one O(5), and two equivalent O(2) atoms to form LiO4 tetrahedra that share corners with four equivalent Si(1)O4 tetrahedra, corners with three equivalent Fe(1)O5 trigonal bipyramids,  an edgeedge with one Li(1)O4 tetrahedra, and  an edgeedge with one Fe(1)O5 trigonal bipyramid. In the second Li site, Li(2) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(4) atoms. Fe(1) is bonded to one O(1), one O(2), one O(3), and two equivalent O(5) atoms to form FeO5 trigonal bipyramids that share  a cornercorner with one Si(2)O4 tetrahedra, corners with three equivalent Li(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra,  an edgeedge with one Li(1)O4 tetrahedra, and  an edgeedge with one Fe(1)O5 trigonal bipyramid. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra, corners with four equivalent Li(1)O4 tetrahedra, and corners with four equivalent Fe(1)O5 trigonal bipyramids. In the second Si site, Si(2) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form SiO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra and corners with two equivalent Fe(1)O5 trigonal bipyramids. There are five inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Li(2), one Fe(1), and one Si(2) atom to form distorted OLi2FeSi trigonal pyramids that share  a cornercorner with one O(3)Li2FeSi tetrahedra, corners with two equivalent O(5)LiFe2Si tetrahedra, corners with three equivalent O(1)Li2FeSi trigonal pyramids, and  an edgeedge with one O(3)Li2FeSi tetrahedra. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Li(1), one Fe(1), and one Si(1) atom. In the third O site, O(3) is bonded to one Li(1), one Li(2), one Fe(1), and one Si(1) atom to form distorted OLi2FeSi tetrahedra that share corners with four equivalent O(5)LiFe2Si tetrahedra,  a cornercorner with one O(1)Li2FeSi trigonal pyramid, and  an edgeedge with one O(1)Li2FeSi trigonal pyramid. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Li(2), one Si(1), and one Si(2) atom. In the fifth O site, O(5) is bonded to one Li(1), two equivalent Fe(1), and one Si(1) atom to form distorted OLiFe2Si tetrahedra that share corners with four equivalent O(3)Li2FeSi tetrahedra, corners with two equivalent O(1)Li2FeSi trigonal pyramids, and  an edgeedge with one O(5)LiFe2Si tetrahedra. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li4Fe2Si3O10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.366
_cell_length_b   5.366
_cell_length_c   17.215
_cell_angle_alpha   81.848
_cell_angle_beta   81.848
_cell_angle_gamma   60.779
_symmetry_Int_Tables_number   1
_cell_volume   426.718
_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  0.827  0.683  0.948  1.0
  Li  Li1  1  0.577  0.794  0.772  1.0
  Li  Li2  1  0.683  0.827  0.448  1.0
  Li  Li3  1  0.794  0.577  0.272  1.0
  Li  Li4  1  0.206  0.423  0.728  1.0
  Li  Li5  1  0.317  0.173  0.552  1.0
  Li  Li6  1  0.423  0.206  0.228  1.0
  Li  Li7  1  0.173  0.317  0.052  1.0
  Fe  Fe8  1  0.197  0.012  0.916  1.0
  Fe  Fe9  1  0.012  0.197  0.416  1.0
  Fe  Fe10  1  0.988  0.803  0.584  1.0
  Fe  Fe11  1  0.803  0.988  0.084  1.0
  Si  Si12  1  0.661  0.467  0.599  1.0
  Si  Si13  1  0.886  0.114  0.750  1.0
  Si  Si14  1  0.533  0.339  0.901  1.0
  Si  Si15  1  0.467  0.661  0.099  1.0
  Si  Si16  1  0.114  0.886  0.250  1.0
  Si  Si17  1  0.339  0.533  0.401  1.0
  O  O18  1  0.918  0.837  0.713  1.0
  O  O19  1  0.837  0.918  0.213  1.0
  O  O20  1  0.619  0.784  0.565  1.0
  O  O21  1  0.557  0.636  0.890  1.0
  O  O22  1  0.781  0.409  0.688  1.0
  O  O23  1  0.784  0.080  0.953  1.0
  O  O24  1  0.920  0.216  0.547  1.0
  O  O25  1  0.784  0.619  0.065  1.0
  O  O26  1  0.636  0.557  0.390  1.0
  O  O27  1  0.591  0.219  0.812  1.0
  O  O28  1  0.409  0.781  0.188  1.0
  O  O29  1  0.364  0.443  0.610  1.0
  O  O30  1  0.216  0.381  0.935  1.0
  O  O31  1  0.080  0.784  0.453  1.0
  O  O32  1  0.216  0.920  0.047  1.0
  O  O33  1  0.219  0.591  0.312  1.0
  O  O34  1  0.443  0.364  0.110  1.0
  O  O35  1  0.381  0.216  0.435  1.0
  O  O36  1  0.163  0.082  0.787  1.0
  O  O37  1  0.082  0.163  0.287  1.0
[/CIF]
.