The material structure described by Li2FeSiO4 is Stannite-like structured and crystallizes in the triclinic P1 space group. There are four inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(3), one O(4), one O(5), and one O(7) atom to form LiO4 tetrahedra that share corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. In the second Li site, Li(2) is bonded to one O(3), one O(4), one O(6), and one O(8) atom to form LiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. In the third Li site, Li(3) is bonded to one O(1), one O(3), one O(6), and one O(7) atom to form LiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. In the fourth Li site, Li(4) is bonded to one O(2), one O(4), one O(5), and one O(8) atom to form LiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(2), one O(6), and one O(8) atom to form FeO4 tetrahedra that share corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. In the second Fe site, Fe(2) is bonded to one O(1), one O(2), one O(5), and one O(7) atom to form FeO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form SiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, and corners with two equivalent Fe(2)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form SiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, and corners with two equivalent Fe(2)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Li(3), one Fe(1), one Fe(2), and one Si(1) atom to form OLiFe2Si tetrahedra that share corners with two equivalent O(5)Li2FeSi tetrahedra, corners with two equivalent O(6)Li2FeSi tetrahedra, corners with two equivalent O(7)Li2FeSi tetrahedra, corners with two equivalent O(8)Li2FeSi tetrahedra, corners with two equivalent O(3)Li3Si tetrahedra, and corners with two equivalent O(2)LiFe2Si tetrahedra. In the second O site, O(2) is bonded to one Li(4), one Fe(1), one Fe(2), and one Si(2) atom to form OLiFe2Si tetrahedra that share corners with two equivalent O(5)Li2FeSi tetrahedra, corners with two equivalent O(6)Li2FeSi tetrahedra, corners with two equivalent O(7)Li2FeSi tetrahedra, corners with two equivalent O(8)Li2FeSi tetrahedra, corners with two equivalent O(4)Li3Si tetrahedra, and corners with two equivalent O(1)LiFe2Si tetrahedra. In the third O site, O(3) is bonded to one Li(1), one Li(2), one Li(3), and one Si(1) atom to form OLi3Si tetrahedra that share corners with two equivalent O(5)Li2FeSi tetrahedra, corners with two equivalent O(6)Li2FeSi tetrahedra, corners with two equivalent O(7)Li2FeSi tetrahedra, corners with two equivalent O(8)Li2FeSi tetrahedra, corners with two equivalent O(4)Li3Si tetrahedra, and corners with two equivalent O(1)LiFe2Si tetrahedra. In the fourth O site, O(4) is bonded to one Li(1), one Li(2), one Li(4), and one Si(2) atom to form OLi3Si tetrahedra that share corners with two equivalent O(5)Li2FeSi tetrahedra, corners with two equivalent O(6)Li2FeSi tetrahedra, corners with two equivalent O(7)Li2FeSi tetrahedra, corners with two equivalent O(8)Li2FeSi tetrahedra, corners with two equivalent O(3)Li3Si tetrahedra, and corners with two equivalent O(2)LiFe2Si tetrahedra. In the fifth O site, O(5) is bonded to one Li(1), one Li(4), one Fe(2), and one Si(1) atom to form OLi2FeSi tetrahedra that share corners with two equivalent O(7)Li2FeSi tetrahedra, corners with two equivalent O(8)Li2FeSi tetrahedra, corners with two equivalent O(3)Li3Si tetrahedra, corners with two equivalent O(4)Li3Si tetrahedra, corners with two equivalent O(1)LiFe2Si tetrahedra, and corners with two equivalent O(2)LiFe2Si tetrahedra. In the sixth O site, O(6) is bonded to one Li(2), one Li(3), one Fe(1), and one Si(2) atom to form OLi2FeSi tetrahedra that share corners with two equivalent O(7)Li2FeSi tetrahedra, corners with two equivalent O(8)Li2FeSi tetrahedra, corners with two equivalent O(3)Li3Si tetrahedra, corners with two equivalent O(4)Li3Si tetrahedra, corners with two equivalent O(1)LiFe2Si tetrahedra, and corners with two equivalent O(2)LiFe2Si tetrahedra. In the seventh O site, O(7) is bonded to one Li(1), one Li(3), one Fe(2), and one Si(2) atom to form distorted OLi2FeSi tetrahedra that share corners with two equivalent O(5)Li2FeSi tetrahedra, corners with two equivalent O(6)Li2FeSi tetrahedra, corners with two equivalent O(3)Li3Si tetrahedra, corners with two equivalent O(4)Li3Si tetrahedra, corners with two equivalent O(1)LiFe2Si tetrahedra, and corners with two equivalent O(2)LiFe2Si tetrahedra. In the eighth O site, O(8) is bonded to one Li(2), one Li(4), one Fe(1), and one Si(1) atom to form distorted OLi2FeSi tetrahedra that share corners with two equivalent O(5)Li2FeSi tetrahedra, corners with two equivalent O(6)Li2FeSi tetrahedra, corners with two equivalent O(3)Li3Si tetrahedra, corners with two equivalent O(4)Li3Si tetrahedra, corners with two equivalent O(1)LiFe2Si tetrahedra, and corners with two equivalent O(2)LiFe2Si tetrahedra. is represented by the CIF file [CIF]
data_Li2FeSiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.035
_cell_length_b   5.490
_cell_length_c   6.345
_cell_angle_alpha   91.728
_cell_angle_beta   89.986
_cell_angle_gamma   89.908
_symmetry_Int_Tables_number   1
_cell_volume   175.308
_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
  Fe  Fe0  1  0.011  0.817  0.016  1.0
  Fe  Fe1  1  0.512  0.182  0.986  1.0
  Li  Li2  1  0.504  0.164  0.498  1.0
  Li  Li3  1  0.003  0.837  0.505  1.0
  Li  Li4  1  0.005  0.349  0.726  1.0
  Li  Li5  1  0.503  0.651  0.277  1.0
  O  O6  1  0.094  0.186  0.025  1.0
  O  O7  1  0.594  0.813  0.977  1.0
  O  O8  1  0.112  0.180  0.459  1.0
  O  O9  1  0.612  0.821  0.544  1.0
  O  O10  1  0.670  0.320  0.254  1.0
  O  O11  1  0.170  0.680  0.748  1.0
  O  O12  1  0.603  0.391  0.747  1.0
  O  O13  1  0.102  0.610  0.256  1.0
  Si  Si14  1  0.999  0.323  0.257  1.0
  Si  Si15  1  0.498  0.677  0.745  1.0
[/CIF]
.
The material structure described by Li2FeSiO4 is Stannite-like structured and crystallizes in the triclinic P1 space group. There are four inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(3), one O(4), one O(5), and one O(7) atom to form LiO4 tetrahedra that share corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. In the second Li site, Li(2) is bonded to one O(3), one O(4), one O(6), and one O(8) atom to form LiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. In the third Li site, Li(3) is bonded to one O(1), one O(3), one O(6), and one O(7) atom to form LiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. In the fourth Li site, Li(4) is bonded to one O(2), one O(4), one O(5), and one O(8) atom to form LiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(2), one O(6), and one O(8) atom to form FeO4 tetrahedra that share corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. In the second Fe site, Fe(2) is bonded to one O(1), one O(2), one O(5), and one O(7) atom to form FeO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form SiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, and corners with two equivalent Fe(2)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form SiO4 tetrahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, and corners with two equivalent Fe(2)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded to one Li(3), one Fe(1), one Fe(2), and one Si(1) atom to form OLiFe2Si tetrahedra that share corners with two equivalent O(5)Li2FeSi tetrahedra, corners with two equivalent O(6)Li2FeSi tetrahedra, corners with two equivalent O(7)Li2FeSi tetrahedra, corners with two equivalent O(8)Li2FeSi tetrahedra, corners with two equivalent O(3)Li3Si tetrahedra, and corners with two equivalent O(2)LiFe2Si tetrahedra. In the second O site, O(2) is bonded to one Li(4), one Fe(1), one Fe(2), and one Si(2) atom to form OLiFe2Si tetrahedra that share corners with two equivalent O(5)Li2FeSi tetrahedra, corners with two equivalent O(6)Li2FeSi tetrahedra, corners with two equivalent O(7)Li2FeSi tetrahedra, corners with two equivalent O(8)Li2FeSi tetrahedra, corners with two equivalent O(4)Li3Si tetrahedra, and corners with two equivalent O(1)LiFe2Si tetrahedra. In the third O site, O(3) is bonded to one Li(1), one Li(2), one Li(3), and one Si(1) atom to form OLi3Si tetrahedra that share corners with two equivalent O(5)Li2FeSi tetrahedra, corners with two equivalent O(6)Li2FeSi tetrahedra, corners with two equivalent O(7)Li2FeSi tetrahedra, corners with two equivalent O(8)Li2FeSi tetrahedra, corners with two equivalent O(4)Li3Si tetrahedra, and corners with two equivalent O(1)LiFe2Si tetrahedra. In the fourth O site, O(4) is bonded to one Li(1), one Li(2), one Li(4), and one Si(2) atom to form OLi3Si tetrahedra that share corners with two equivalent O(5)Li2FeSi tetrahedra, corners with two equivalent O(6)Li2FeSi tetrahedra, corners with two equivalent O(7)Li2FeSi tetrahedra, corners with two equivalent O(8)Li2FeSi tetrahedra, corners with two equivalent O(3)Li3Si tetrahedra, and corners with two equivalent O(2)LiFe2Si tetrahedra. In the fifth O site, O(5) is bonded to one Li(1), one Li(4), one Fe(2), and one Si(1) atom to form OLi2FeSi tetrahedra that share corners with two equivalent O(7)Li2FeSi tetrahedra, corners with two equivalent O(8)Li2FeSi tetrahedra, corners with two equivalent O(3)Li3Si tetrahedra, corners with two equivalent O(4)Li3Si tetrahedra, corners with two equivalent O(1)LiFe2Si tetrahedra, and corners with two equivalent O(2)LiFe2Si tetrahedra. In the sixth O site, O(6) is bonded to one Li(2), one Li(3), one Fe(1), and one Si(2) atom to form OLi2FeSi tetrahedra that share corners with two equivalent O(7)Li2FeSi tetrahedra, corners with two equivalent O(8)Li2FeSi tetrahedra, corners with two equivalent O(3)Li3Si tetrahedra, corners with two equivalent O(4)Li3Si tetrahedra, corners with two equivalent O(1)LiFe2Si tetrahedra, and corners with two equivalent O(2)LiFe2Si tetrahedra. In the seventh O site, O(7) is bonded to one Li(1), one Li(3), one Fe(2), and one Si(2) atom to form distorted OLi2FeSi tetrahedra that share corners with two equivalent O(5)Li2FeSi tetrahedra, corners with two equivalent O(6)Li2FeSi tetrahedra, corners with two equivalent O(3)Li3Si tetrahedra, corners with two equivalent O(4)Li3Si tetrahedra, corners with two equivalent O(1)LiFe2Si tetrahedra, and corners with two equivalent O(2)LiFe2Si tetrahedra. In the eighth O site, O(8) is bonded to one Li(2), one Li(4), one Fe(1), and one Si(1) atom to form distorted OLi2FeSi tetrahedra that share corners with two equivalent O(5)Li2FeSi tetrahedra, corners with two equivalent O(6)Li2FeSi tetrahedra, corners with two equivalent O(3)Li3Si tetrahedra, corners with two equivalent O(4)Li3Si tetrahedra, corners with two equivalent O(1)LiFe2Si tetrahedra, and corners with two equivalent O(2)LiFe2Si tetrahedra. is represented by the CIF file [CIF]
data_Li2FeSiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.035
_cell_length_b   5.490
_cell_length_c   6.345
_cell_angle_alpha   91.728
_cell_angle_beta   89.986
_cell_angle_gamma   89.908
_symmetry_Int_Tables_number   1
_cell_volume   175.308
_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
  Fe  Fe0  1  0.011  0.817  0.016  1.0
  Fe  Fe1  1  0.512  0.182  0.986  1.0
  Li  Li2  1  0.504  0.164  0.498  1.0
  Li  Li3  1  0.003  0.837  0.505  1.0
  Li  Li4  1  0.005  0.349  0.726  1.0
  Li  Li5  1  0.503  0.651  0.277  1.0
  O  O6  1  0.094  0.186  0.025  1.0
  O  O7  1  0.594  0.813  0.977  1.0
  O  O8  1  0.112  0.180  0.459  1.0
  O  O9  1  0.612  0.821  0.544  1.0
  O  O10  1  0.670  0.320  0.254  1.0
  O  O11  1  0.170  0.680  0.748  1.0
  O  O12  1  0.603  0.391  0.747  1.0
  O  O13  1  0.102  0.610  0.256  1.0
  Si  Si14  1  0.999  0.323  0.257  1.0
  Si  Si15  1  0.498  0.677  0.745  1.0
[/CIF]
.