The structure described by Li2FeSiO4 is lead oxide-derived structured and crystallizes in the orthorhombic Pna2_1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form distorted LiO4 trigonal pyramids that share corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with four equivalent Fe(1)O4 tetrahedra,  an edgeedge with one Li(2)O4 tetrahedra, and  an edgeedge with one Si(1)O4 tetrahedra. In the second Li site, Li(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form LiO4 tetrahedra that share corners with four equivalent Fe(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, corners with two equivalent Li(1)O4 trigonal pyramids, and  an edgeedge with one Li(1)O4 trigonal pyramid. Fe(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form FeO4 tetrahedra that share corners with four equivalent Li(2)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and corners with four equivalent Li(1)O4 trigonal pyramids. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with four equivalent Li(2)O4 tetrahedra, corners with four equivalent Fe(1)O4 tetrahedra, corners with two equivalent Li(1)O4 trigonal pyramids, and  an edgeedge with one Li(1)O4 trigonal pyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Li(1), one Li(2), one Fe(1), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OLi2FeSi trigonal pyramids. In the second O site, O(2) is bonded to one Li(1), one Li(2), one Fe(1), and one Si(1) atom to form corner-sharing OLi2FeSi tetrahedra. 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 a mixture of corner and edge-sharing OLi2FeSi tetrahedra. In the fourth O site, O(4) is bonded to one Li(1), one Li(2), one Fe(1), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OLi2FeSi tetrahedra. is represented by the CIF card [CIF]
data_Li2FeSiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.183
_cell_length_b   6.311
_cell_length_c   11.005
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   359.990
_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  0.698  0.950  0.586  1.0
  Li  Li1  1  0.311  0.703  0.675  1.0
  Li  Li2  1  0.811  0.203  0.825  1.0
  Li  Li3  1  0.198  0.450  0.914  1.0
  Li  Li4  1  0.802  0.950  0.086  1.0
  Li  Li5  1  0.189  0.703  0.175  1.0
  Li  Li6  1  0.689  0.203  0.325  1.0
  Li  Li7  1  0.302  0.450  0.414  1.0
  Fe  Fe8  1  0.818  0.468  0.586  1.0
  Fe  Fe9  1  0.682  0.468  0.086  1.0
  Fe  Fe10  1  0.318  0.968  0.914  1.0
  Fe  Fe11  1  0.182  0.968  0.414  1.0
  Si  Si12  1  0.322  0.211  0.663  1.0
  Si  Si13  1  0.822  0.711  0.837  1.0
  Si  Si14  1  0.178  0.211  0.163  1.0
  Si  Si15  1  0.678  0.711  0.337  1.0
  O  O16  1  0.256  0.986  0.592  1.0
  O  O17  1  0.214  0.423  0.589  1.0
  O  O18  1  0.641  0.220  0.667  1.0
  O  O19  1  0.703  0.708  0.697  1.0
  O  O20  1  0.203  0.208  0.803  1.0
  O  O21  1  0.141  0.720  0.833  1.0
  O  O22  1  0.714  0.923  0.911  1.0
  O  O23  1  0.756  0.486  0.908  1.0
  O  O24  1  0.244  0.986  0.092  1.0
  O  O25  1  0.286  0.423  0.089  1.0
  O  O26  1  0.859  0.220  0.167  1.0
  O  O27  1  0.797  0.708  0.197  1.0
  O  O28  1  0.297  0.208  0.303  1.0
  O  O29  1  0.359  0.720  0.333  1.0
  O  O30  1  0.786  0.923  0.411  1.0
  O  O31  1  0.744  0.486  0.408  1.0
[/CIF]
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The structure described by Li2FeSiO4 is lead oxide-derived structured and crystallizes in the orthorhombic Pna2_1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form distorted LiO4 trigonal pyramids that share corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with four equivalent Fe(1)O4 tetrahedra,  an edgeedge with one Li(2)O4 tetrahedra, and  an edgeedge with one Si(1)O4 tetrahedra. In the second Li site, Li(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form LiO4 tetrahedra that share corners with four equivalent Fe(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, corners with two equivalent Li(1)O4 trigonal pyramids, and  an edgeedge with one Li(1)O4 trigonal pyramid. Fe(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form FeO4 tetrahedra that share corners with four equivalent Li(2)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and corners with four equivalent Li(1)O4 trigonal pyramids. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with four equivalent Li(2)O4 tetrahedra, corners with four equivalent Fe(1)O4 tetrahedra, corners with two equivalent Li(1)O4 trigonal pyramids, and  an edgeedge with one Li(1)O4 trigonal pyramid. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Li(1), one Li(2), one Fe(1), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OLi2FeSi trigonal pyramids. In the second O site, O(2) is bonded to one Li(1), one Li(2), one Fe(1), and one Si(1) atom to form corner-sharing OLi2FeSi tetrahedra. 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 a mixture of corner and edge-sharing OLi2FeSi tetrahedra. In the fourth O site, O(4) is bonded to one Li(1), one Li(2), one Fe(1), and one Si(1) atom to form a mixture of distorted corner and edge-sharing OLi2FeSi tetrahedra. is represented by the CIF card [CIF]
data_Li2FeSiO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.183
_cell_length_b   6.311
_cell_length_c   11.005
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   359.990
_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  0.698  0.950  0.586  1.0
  Li  Li1  1  0.311  0.703  0.675  1.0
  Li  Li2  1  0.811  0.203  0.825  1.0
  Li  Li3  1  0.198  0.450  0.914  1.0
  Li  Li4  1  0.802  0.950  0.086  1.0
  Li  Li5  1  0.189  0.703  0.175  1.0
  Li  Li6  1  0.689  0.203  0.325  1.0
  Li  Li7  1  0.302  0.450  0.414  1.0
  Fe  Fe8  1  0.818  0.468  0.586  1.0
  Fe  Fe9  1  0.682  0.468  0.086  1.0
  Fe  Fe10  1  0.318  0.968  0.914  1.0
  Fe  Fe11  1  0.182  0.968  0.414  1.0
  Si  Si12  1  0.322  0.211  0.663  1.0
  Si  Si13  1  0.822  0.711  0.837  1.0
  Si  Si14  1  0.178  0.211  0.163  1.0
  Si  Si15  1  0.678  0.711  0.337  1.0
  O  O16  1  0.256  0.986  0.592  1.0
  O  O17  1  0.214  0.423  0.589  1.0
  O  O18  1  0.641  0.220  0.667  1.0
  O  O19  1  0.703  0.708  0.697  1.0
  O  O20  1  0.203  0.208  0.803  1.0
  O  O21  1  0.141  0.720  0.833  1.0
  O  O22  1  0.714  0.923  0.911  1.0
  O  O23  1  0.756  0.486  0.908  1.0
  O  O24  1  0.244  0.986  0.092  1.0
  O  O25  1  0.286  0.423  0.089  1.0
  O  O26  1  0.859  0.220  0.167  1.0
  O  O27  1  0.797  0.708  0.197  1.0
  O  O28  1  0.297  0.208  0.303  1.0
  O  O29  1  0.359  0.720  0.333  1.0
  O  O30  1  0.786  0.923  0.411  1.0
  O  O31  1  0.744  0.486  0.408  1.0
[/CIF]
.