The compound described by LiFeSiO4 crystallizes in the monoclinic Pc space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(3), one O(4), and one O(8) atom to form distorted LiO4 tetrahedra that share  a cornercorner with one Fe(2)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with three equivalent Fe(1)O4 tetrahedra, and corners with three equivalent Si(2)O4 tetrahedra. In the second Li site, Li(2) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form LiO4 tetrahedra that share  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with three equivalent Fe(2)O4 tetrahedra, and corners with three equivalent Si(1)O4 tetrahedra. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form FeO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, corners with three equivalent Li(1)O4 tetrahedra, and  an edgeedge with one Si(1)O4 tetrahedra. In the second Fe site, Fe(2) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form FeO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with three equivalent Li(2)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 Li(1)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with three equivalent Li(2)O4 tetrahedra, and  an edgeedge with one Fe(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 Li(2)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, and corners with three equivalent Li(1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Li(1), one Fe(1), and one Si(2) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Li(2), one Fe(2), and one Si(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Li(1), one Fe(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(1), one Fe(2), and one Si(2) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Li(2), one Fe(1), 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 T-shaped geometry to one Li(1), one Fe(1), and one Si(1) atom. is represented by the CIF card [CIF]
data_LiFeSiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.400
_cell_length_b   7.995
_cell_length_c   8.526
_cell_angle_alpha   74.378
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   354.486
_cell_formula_units_Z   4
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  0.344  0.134  0.201  1.0
  Li  Li1  1  0.835  0.633  0.394  1.0
  Li  Li2  1  0.656  0.134  0.701  1.0
  Li  Li3  1  0.165  0.633  0.894  1.0
  Fe  Fe4  1  0.850  0.027  0.070  1.0
  Fe  Fe5  1  0.331  0.506  0.277  1.0
  Fe  Fe6  1  0.150  0.027  0.570  1.0
  Fe  Fe7  1  0.669  0.506  0.777  1.0
  Si  Si8  1  0.661  0.747  0.017  1.0
  Si  Si9  1  0.827  0.261  0.322  1.0
  Si  Si10  1  0.339  0.747  0.517  1.0
  Si  Si11  1  0.173  0.261  0.822  1.0
  O  O12  1  0.167  0.117  0.002  1.0
  O  O13  1  0.382  0.669  0.068  1.0
  O  O14  1  0.705  0.176  0.184  1.0
  O  O15  1  0.120  0.316  0.275  1.0
  O  O16  1  0.810  0.782  0.176  1.0
  O  O17  1  0.659  0.427  0.337  1.0
  O  O18  1  0.833  0.117  0.502  1.0
  O  O19  1  0.196  0.615  0.430  1.0
  O  O20  1  0.323  0.951  0.401  1.0
  O  O21  1  0.618  0.669  0.568  1.0
  O  O22  1  0.295  0.176  0.684  1.0
  O  O23  1  0.880  0.316  0.775  1.0
  O  O24  1  0.190  0.782  0.676  1.0
  O  O25  1  0.341  0.427  0.837  1.0
  O  O26  1  0.804  0.615  0.930  1.0
  O  O27  1  0.677  0.951  0.901  1.0
[/CIF]
.
The compound described by LiFeSiO4 crystallizes in the monoclinic Pc space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(3), one O(4), and one O(8) atom to form distorted LiO4 tetrahedra that share  a cornercorner with one Fe(2)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with three equivalent Fe(1)O4 tetrahedra, and corners with three equivalent Si(2)O4 tetrahedra. In the second Li site, Li(2) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form LiO4 tetrahedra that share  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with three equivalent Fe(2)O4 tetrahedra, and corners with three equivalent Si(1)O4 tetrahedra. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form FeO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, corners with three equivalent Li(1)O4 tetrahedra, and  an edgeedge with one Si(1)O4 tetrahedra. In the second Fe site, Fe(2) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form FeO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and corners with three equivalent Li(2)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 Li(1)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with three equivalent Li(2)O4 tetrahedra, and  an edgeedge with one Fe(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 Li(2)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, and corners with three equivalent Li(1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Li(1), one Fe(1), and one Si(2) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Li(2), one Fe(2), and one Si(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Li(1), one Fe(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Li(1), one Fe(2), and one Si(2) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Li(2), one Fe(1), 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 T-shaped geometry to one Li(1), one Fe(1), and one Si(1) atom. is represented by the CIF card [CIF]
data_LiFeSiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.400
_cell_length_b   7.995
_cell_length_c   8.526
_cell_angle_alpha   74.378
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   354.486
_cell_formula_units_Z   4
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  0.344  0.134  0.201  1.0
  Li  Li1  1  0.835  0.633  0.394  1.0
  Li  Li2  1  0.656  0.134  0.701  1.0
  Li  Li3  1  0.165  0.633  0.894  1.0
  Fe  Fe4  1  0.850  0.027  0.070  1.0
  Fe  Fe5  1  0.331  0.506  0.277  1.0
  Fe  Fe6  1  0.150  0.027  0.570  1.0
  Fe  Fe7  1  0.669  0.506  0.777  1.0
  Si  Si8  1  0.661  0.747  0.017  1.0
  Si  Si9  1  0.827  0.261  0.322  1.0
  Si  Si10  1  0.339  0.747  0.517  1.0
  Si  Si11  1  0.173  0.261  0.822  1.0
  O  O12  1  0.167  0.117  0.002  1.0
  O  O13  1  0.382  0.669  0.068  1.0
  O  O14  1  0.705  0.176  0.184  1.0
  O  O15  1  0.120  0.316  0.275  1.0
  O  O16  1  0.810  0.782  0.176  1.0
  O  O17  1  0.659  0.427  0.337  1.0
  O  O18  1  0.833  0.117  0.502  1.0
  O  O19  1  0.196  0.615  0.430  1.0
  O  O20  1  0.323  0.951  0.401  1.0
  O  O21  1  0.618  0.669  0.568  1.0
  O  O22  1  0.295  0.176  0.684  1.0
  O  O23  1  0.880  0.316  0.775  1.0
  O  O24  1  0.190  0.782  0.676  1.0
  O  O25  1  0.341  0.427  0.837  1.0
  O  O26  1  0.804  0.615  0.930  1.0
  O  O27  1  0.677  0.951  0.901  1.0
[/CIF]
.