The compound described by Li2Fe5Si5O16 crystallizes in the triclinic P1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a 3-coordinate geometry to one O(1), one O(16), and one O(3) atom. In the second Li site, Li(2) is bonded to one O(10), one O(13), one O(4), and one O(7) atom to form LiO4 tetrahedra that share  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Fe(4)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. There are five inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(11), one O(15), one O(2), and one O(6) atom to form FeO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Fe(5)O4 tetrahedra, and corners with two equivalent Si(4)O4 tetrahedra. In the second Fe site, Fe(2) is bonded to one O(11), one O(6), one O(8), and one O(9) atom to form FeO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(3)O4 tetrahedra, and corners with two equivalent Si(4)O4 tetrahedra. In the third Fe site, Fe(3) is bonded to one O(14), one O(5), one O(8), and one O(9) atom to form FeO4 tetrahedra that share  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Fe(5)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. In the fourth Fe site, Fe(4) is bonded to one O(1), one O(13), one O(16), and one O(4) atom to form FeO4 tetrahedra that share  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. In the fifth Fe site, Fe(5) is bonded to one O(14), one O(15), one O(2), and one O(5) atom to form FeO4 tetrahedra that share  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(3)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(4), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, and corners with two equivalent Fe(4)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(2), one O(3), one O(5), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Fe(3)O4 tetrahedra, and corners with two equivalent Fe(5)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(10), one O(12), one O(3), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, and corners with two equivalent Si(5)O4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(11), one O(13), one O(15), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Fe(3)O4 tetrahedra,  a cornercorner with one Fe(4)O4 tetrahedra,  a cornercorner with one Fe(5)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, and corners with two equivalent Fe(2)O4 tetrahedra. In the fifth Si site, Si(5) is bonded to one O(10), one O(12), one O(14), and one O(16) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Fe(3)O4 tetrahedra,  a cornercorner with one Fe(4)O4 tetrahedra,  a cornercorner with one Fe(5)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Li(1), one Fe(4), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Fe(1), one Fe(5), and one Si(2) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Li(1), one Si(2), and one Si(3) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Li(2), one Fe(4), and one Si(1) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Fe(3), one Fe(5), and one Si(2) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Fe(1), one Fe(2), and one Si(1) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Li(2), one Si(1), and one Si(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(3), and one Si(2) atom. In the ninth O site, O(9) is bonded in a trigonal non-coplanar geometry to one Fe(2), one Fe(3), and one Si(4) atom. In the tenth O site, O(10) is bonded in a distorted trigonal non-coplanar geometry to one Li(2), one Si(3), and one Si(5) atom. In the eleventh O site, O(11) is bonded in a trigonal planar geometry to one Fe(1), one Fe(2), and one Si(4) atom. In the twelfth O site, O(12) is bonded in a distorted bent 150 degrees geometry to one Si(3) and one Si(5) atom. In the thirteenth O site, O(13) is bonded in a trigonal planar geometry to one Li(2), one Fe(4), and one Si(4) atom. In the fourteenth O site, O(14) is bonded in a trigonal planar geometry to one Fe(3), one Fe(5), and one Si(5) atom. In the fifteenth O site, O(15) is bonded in a trigonal planar geometry to one Fe(1), one Fe(5), and one Si(4) atom. In the sixteenth O site, O(16) is bonded in a distorted trigonal non-coplanar geometry to one Li(1), one Fe(4), and one Si(5) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li2Fe5Si5O16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.096
_cell_length_b   6.957
_cell_length_c   10.416
_cell_angle_alpha   89.360
_cell_angle_beta   89.877
_cell_angle_gamma   89.988
_symmetry_Int_Tables_number   1
_cell_volume   369.232
_cell_formula_units_Z   1
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  0.844  0.003  0.837  1.0
  Li  Li1  1  0.321  0.497  0.644  1.0
  Fe  Fe2  1  0.703  0.020  0.346  1.0
  Fe  Fe3  1  0.693  0.510  0.355  1.0
  Fe  Fe4  1  0.183  0.502  0.163  1.0
  Fe  Fe5  1  0.324  0.998  0.652  1.0
  Fe  Fe6  1  0.195  0.996  0.148  1.0
  Si  Si7  1  0.836  0.239  0.604  1.0
  Si  Si8  1  0.679  0.268  0.087  1.0
  Si  Si9  1  0.796  0.490  0.836  1.0
  Si  Si10  1  0.192  0.756  0.411  1.0
  Si  Si11  1  0.290  0.734  0.904  1.0
  O  O12  1  0.719  0.044  0.668  1.0
  O  O13  1  0.802  0.068  0.145  1.0
  O  O14  1  0.758  0.297  0.930  1.0
  O  O15  1  0.152  0.255  0.619  1.0
  O  O16  1  0.359  0.256  0.106  1.0
  O  O17  1  0.731  0.262  0.454  1.0
  O  O18  1  0.712  0.430  0.689  1.0
  O  O19  1  0.789  0.456  0.163  1.0
  O  O20  1  0.298  0.556  0.344  1.0
  O  O21  1  0.106  0.557  0.841  1.0
  O  O22  1  0.872  0.764  0.381  1.0
  O  O23  1  0.603  0.670  0.876  1.0
  O  O24  1  0.274  0.747  0.562  1.0
  O  O25  1  0.239  0.742  0.059  1.0
  O  O26  1  0.312  0.948  0.335  1.0
  O  O27  1  0.217  0.937  0.841  1.0
[/CIF]
.
The compound described by Li2Fe5Si5O16 crystallizes in the triclinic P1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a 3-coordinate geometry to one O(1), one O(16), and one O(3) atom. In the second Li site, Li(2) is bonded to one O(10), one O(13), one O(4), and one O(7) atom to form LiO4 tetrahedra that share  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Fe(4)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. There are five inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(11), one O(15), one O(2), and one O(6) atom to form FeO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Fe(5)O4 tetrahedra, and corners with two equivalent Si(4)O4 tetrahedra. In the second Fe site, Fe(2) is bonded to one O(11), one O(6), one O(8), and one O(9) atom to form FeO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(3)O4 tetrahedra, and corners with two equivalent Si(4)O4 tetrahedra. In the third Fe site, Fe(3) is bonded to one O(14), one O(5), one O(8), and one O(9) atom to form FeO4 tetrahedra that share  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Fe(5)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. In the fourth Fe site, Fe(4) is bonded to one O(1), one O(13), one O(16), and one O(4) atom to form FeO4 tetrahedra that share  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. In the fifth Fe site, Fe(5) is bonded to one O(14), one O(15), one O(2), and one O(5) atom to form FeO4 tetrahedra that share  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(3)O4 tetrahedra, and corners with two equivalent Si(2)O4 tetrahedra. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(4), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, and corners with two equivalent Fe(4)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(2), one O(3), one O(5), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Fe(3)O4 tetrahedra, and corners with two equivalent Fe(5)O4 tetrahedra. In the third Si site, Si(3) is bonded to one O(10), one O(12), one O(3), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, and corners with two equivalent Si(5)O4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(11), one O(13), one O(15), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Fe(3)O4 tetrahedra,  a cornercorner with one Fe(4)O4 tetrahedra,  a cornercorner with one Fe(5)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, and corners with two equivalent Fe(2)O4 tetrahedra. In the fifth Si site, Si(5) is bonded to one O(10), one O(12), one O(14), and one O(16) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Fe(3)O4 tetrahedra,  a cornercorner with one Fe(4)O4 tetrahedra,  a cornercorner with one Fe(5)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Li(1), one Fe(4), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Fe(1), one Fe(5), and one Si(2) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Li(1), one Si(2), and one Si(3) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Li(2), one Fe(4), and one Si(1) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Fe(3), one Fe(5), and one Si(2) atom. In the sixth O site, O(6) is bonded in a trigonal planar geometry to one Fe(1), one Fe(2), and one Si(1) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Li(2), one Si(1), and one Si(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(3), and one Si(2) atom. In the ninth O site, O(9) is bonded in a trigonal non-coplanar geometry to one Fe(2), one Fe(3), and one Si(4) atom. In the tenth O site, O(10) is bonded in a distorted trigonal non-coplanar geometry to one Li(2), one Si(3), and one Si(5) atom. In the eleventh O site, O(11) is bonded in a trigonal planar geometry to one Fe(1), one Fe(2), and one Si(4) atom. In the twelfth O site, O(12) is bonded in a distorted bent 150 degrees geometry to one Si(3) and one Si(5) atom. In the thirteenth O site, O(13) is bonded in a trigonal planar geometry to one Li(2), one Fe(4), and one Si(4) atom. In the fourteenth O site, O(14) is bonded in a trigonal planar geometry to one Fe(3), one Fe(5), and one Si(5) atom. In the fifteenth O site, O(15) is bonded in a trigonal planar geometry to one Fe(1), one Fe(5), and one Si(4) atom. In the sixteenth O site, O(16) is bonded in a distorted trigonal non-coplanar geometry to one Li(1), one Fe(4), and one Si(5) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li2Fe5Si5O16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.096
_cell_length_b   6.957
_cell_length_c   10.416
_cell_angle_alpha   89.360
_cell_angle_beta   89.877
_cell_angle_gamma   89.988
_symmetry_Int_Tables_number   1
_cell_volume   369.232
_cell_formula_units_Z   1
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  0.844  0.003  0.837  1.0
  Li  Li1  1  0.321  0.497  0.644  1.0
  Fe  Fe2  1  0.703  0.020  0.346  1.0
  Fe  Fe3  1  0.693  0.510  0.355  1.0
  Fe  Fe4  1  0.183  0.502  0.163  1.0
  Fe  Fe5  1  0.324  0.998  0.652  1.0
  Fe  Fe6  1  0.195  0.996  0.148  1.0
  Si  Si7  1  0.836  0.239  0.604  1.0
  Si  Si8  1  0.679  0.268  0.087  1.0
  Si  Si9  1  0.796  0.490  0.836  1.0
  Si  Si10  1  0.192  0.756  0.411  1.0
  Si  Si11  1  0.290  0.734  0.904  1.0
  O  O12  1  0.719  0.044  0.668  1.0
  O  O13  1  0.802  0.068  0.145  1.0
  O  O14  1  0.758  0.297  0.930  1.0
  O  O15  1  0.152  0.255  0.619  1.0
  O  O16  1  0.359  0.256  0.106  1.0
  O  O17  1  0.731  0.262  0.454  1.0
  O  O18  1  0.712  0.430  0.689  1.0
  O  O19  1  0.789  0.456  0.163  1.0
  O  O20  1  0.298  0.556  0.344  1.0
  O  O21  1  0.106  0.557  0.841  1.0
  O  O22  1  0.872  0.764  0.381  1.0
  O  O23  1  0.603  0.670  0.876  1.0
  O  O24  1  0.274  0.747  0.562  1.0
  O  O25  1  0.239  0.742  0.059  1.0
  O  O26  1  0.312  0.948  0.335  1.0
  O  O27  1  0.217  0.937  0.841  1.0
[/CIF]
.