The structure described by Li2Fe2Si8O19 crystallizes in the triclinic P1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a rectangular see-saw-like geometry to one O(12), one O(13), one O(4), and one O(6) atom. In the second Li site, Li(2) is bonded in a rectangular see-saw-like geometry to one O(13), one O(15), one O(6), and one O(7) atom. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 5-coordinate geometry to one O(13), one O(17), one O(4), one O(6), and one O(7) atom. In the second Fe site, Fe(2) is bonded in a 5-coordinate geometry to one O(12), one O(13), one O(15), one O(17), and one O(6) atom. There are eight inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(10), one O(2), and one O(5) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(18), one O(19), one O(3), and one O(8) atom to form corner-sharing SiO4 tetrahedra. In the third Si site, Si(3) is bonded to one O(17), one O(3), one O(4), and one O(6) atom to form corner-sharing SiO4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(11), one O(5), one O(7), and one O(9) atom to form corner-sharing SiO4 tetrahedra. In the fifth Si site, Si(5) is bonded to one O(10), one O(12), one O(14), and one O(8) atom to form corner-sharing SiO4 tetrahedra. In the sixth Si site, Si(6) is bonded to one O(13), one O(15), one O(16), and one O(17) atom to form corner-sharing SiO4 tetrahedra. In the seventh Si site, Si(7) is bonded to one O(1), one O(11), one O(16), and one O(2) atom to form corner-sharing SiO4 tetrahedra. In the eighth Si site, Si(8) is bonded to one O(14), one O(18), one O(19), and one O(9) atom to form corner-sharing SiO4 tetrahedra. There are nineteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(7) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(7) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(3) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Li(1), one Fe(1), and one Si(3) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(4) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Li(1), one Li(2), one Fe(1), one Fe(2), and one Si(3) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Li(2), one Fe(1), and one Si(4) atom. In the eighth O site, O(8) is bonded in a distorted linear geometry to one Si(2) and one Si(5) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Si(4) and one Si(8) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(5) atom. In the eleventh O site, O(11) is bonded in a distorted linear geometry to one Si(4) and one Si(7) atom. In the twelfth O site, O(12) is bonded in a distorted T-shaped geometry to one Li(1), one Fe(2), and one Si(5) atom. In the thirteenth O site, O(13) is bonded in a 5-coordinate geometry to one Li(1), one Li(2), one Fe(1), one Fe(2), and one Si(6) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Si(5) and one Si(8) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Li(2), one Fe(2), and one Si(6) atom. In the sixteenth O site, O(16) is bonded in a bent 150 degrees geometry to one Si(6) and one Si(7) atom. In the seventeenth O site, O(17) is bonded in a 2-coordinate geometry to one Fe(1), one Fe(2), one Si(3), and one Si(6) atom. In the eighteenth O site, O(18) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(8) atom. In the nineteenth O site, O(19) is bonded in a bent 120 degrees geometry to one Si(2) and one Si(8) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li2Fe2Si8O19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.913
_cell_length_b   7.182
_cell_length_c   12.364
_cell_angle_alpha   98.325
_cell_angle_beta   101.409
_cell_angle_gamma   109.876
_symmetry_Int_Tables_number   1
_cell_volume   391.367
_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  0.336  0.001  0.606  1.0
  Li  Li1  1  0.732  0.996  0.396  1.0
  Fe  Fe2  1  0.181  0.736  0.412  1.0
  Fe  Fe3  1  0.045  0.274  0.586  1.0
  Si  Si4  1  0.533  0.311  0.078  1.0
  Si  Si5  1  0.701  0.857  0.824  1.0
  Si  Si6  1  0.689  0.720  0.569  1.0
  Si  Si7  1  0.476  0.726  0.171  1.0
  Si  Si8  1  0.580  0.275  0.829  1.0
  Si  Si9  1  0.400  0.275  0.430  1.0
  Si  Si10  1  0.022  0.143  0.175  1.0
  Si  Si11  1  0.143  0.689  0.922  1.0
  O  O12  1  0.259  0.129  0.102  1.0
  O  O13  1  0.841  0.271  0.118  1.0
  O  O14  1  0.663  0.728  0.699  1.0
  O  O15  1  0.001  0.725  0.545  1.0
  O  O16  1  0.577  0.530  0.154  1.0
  O  O17  1  0.603  0.906  0.531  1.0
  O  O18  1  0.381  0.762  0.287  1.0
  O  O19  1  0.674  0.074  0.815  1.0
  O  O20  1  0.214  0.694  0.057  1.0
  O  O21  1  0.463  0.306  0.943  1.0
  O  O22  1  0.785  0.926  0.183  1.0
  O  O23  1  0.334  0.241  0.712  1.0
  O  O24  1  0.168  0.090  0.468  1.0
  O  O25  1  0.895  0.470  0.847  1.0
  O  O26  1  0.731  0.271  0.454  1.0
  O  O27  1  0.236  0.271  0.300  1.0
  O  O28  1  0.408  0.497  0.501  1.0
  O  O29  1  0.448  0.729  0.881  1.0
  O  O30  1  0.023  0.870  0.898  1.0
[/CIF]
.
The structure described by Li2Fe2Si8O19 crystallizes in the triclinic P1 space group. There are two inequivalent Li sites. In the first Li site, Li(1) is bonded in a rectangular see-saw-like geometry to one O(12), one O(13), one O(4), and one O(6) atom. In the second Li site, Li(2) is bonded in a rectangular see-saw-like geometry to one O(13), one O(15), one O(6), and one O(7) atom. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 5-coordinate geometry to one O(13), one O(17), one O(4), one O(6), and one O(7) atom. In the second Fe site, Fe(2) is bonded in a 5-coordinate geometry to one O(12), one O(13), one O(15), one O(17), and one O(6) atom. There are eight inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(10), one O(2), and one O(5) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(18), one O(19), one O(3), and one O(8) atom to form corner-sharing SiO4 tetrahedra. In the third Si site, Si(3) is bonded to one O(17), one O(3), one O(4), and one O(6) atom to form corner-sharing SiO4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(11), one O(5), one O(7), and one O(9) atom to form corner-sharing SiO4 tetrahedra. In the fifth Si site, Si(5) is bonded to one O(10), one O(12), one O(14), and one O(8) atom to form corner-sharing SiO4 tetrahedra. In the sixth Si site, Si(6) is bonded to one O(13), one O(15), one O(16), and one O(17) atom to form corner-sharing SiO4 tetrahedra. In the seventh Si site, Si(7) is bonded to one O(1), one O(11), one O(16), and one O(2) atom to form corner-sharing SiO4 tetrahedra. In the eighth Si site, Si(8) is bonded to one O(14), one O(18), one O(19), and one O(9) atom to form corner-sharing SiO4 tetrahedra. There are nineteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(7) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(7) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(3) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Li(1), one Fe(1), and one Si(3) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(4) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Li(1), one Li(2), one Fe(1), one Fe(2), and one Si(3) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Li(2), one Fe(1), and one Si(4) atom. In the eighth O site, O(8) is bonded in a distorted linear geometry to one Si(2) and one Si(5) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Si(4) and one Si(8) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(5) atom. In the eleventh O site, O(11) is bonded in a distorted linear geometry to one Si(4) and one Si(7) atom. In the twelfth O site, O(12) is bonded in a distorted T-shaped geometry to one Li(1), one Fe(2), and one Si(5) atom. In the thirteenth O site, O(13) is bonded in a 5-coordinate geometry to one Li(1), one Li(2), one Fe(1), one Fe(2), and one Si(6) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Si(5) and one Si(8) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Li(2), one Fe(2), and one Si(6) atom. In the sixteenth O site, O(16) is bonded in a bent 150 degrees geometry to one Si(6) and one Si(7) atom. In the seventeenth O site, O(17) is bonded in a 2-coordinate geometry to one Fe(1), one Fe(2), one Si(3), and one Si(6) atom. In the eighteenth O site, O(18) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(8) atom. In the nineteenth O site, O(19) is bonded in a bent 120 degrees geometry to one Si(2) and one Si(8) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li2Fe2Si8O19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.913
_cell_length_b   7.182
_cell_length_c   12.364
_cell_angle_alpha   98.325
_cell_angle_beta   101.409
_cell_angle_gamma   109.876
_symmetry_Int_Tables_number   1
_cell_volume   391.367
_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  0.336  0.001  0.606  1.0
  Li  Li1  1  0.732  0.996  0.396  1.0
  Fe  Fe2  1  0.181  0.736  0.412  1.0
  Fe  Fe3  1  0.045  0.274  0.586  1.0
  Si  Si4  1  0.533  0.311  0.078  1.0
  Si  Si5  1  0.701  0.857  0.824  1.0
  Si  Si6  1  0.689  0.720  0.569  1.0
  Si  Si7  1  0.476  0.726  0.171  1.0
  Si  Si8  1  0.580  0.275  0.829  1.0
  Si  Si9  1  0.400  0.275  0.430  1.0
  Si  Si10  1  0.022  0.143  0.175  1.0
  Si  Si11  1  0.143  0.689  0.922  1.0
  O  O12  1  0.259  0.129  0.102  1.0
  O  O13  1  0.841  0.271  0.118  1.0
  O  O14  1  0.663  0.728  0.699  1.0
  O  O15  1  0.001  0.725  0.545  1.0
  O  O16  1  0.577  0.530  0.154  1.0
  O  O17  1  0.603  0.906  0.531  1.0
  O  O18  1  0.381  0.762  0.287  1.0
  O  O19  1  0.674  0.074  0.815  1.0
  O  O20  1  0.214  0.694  0.057  1.0
  O  O21  1  0.463  0.306  0.943  1.0
  O  O22  1  0.785  0.926  0.183  1.0
  O  O23  1  0.334  0.241  0.712  1.0
  O  O24  1  0.168  0.090  0.468  1.0
  O  O25  1  0.895  0.470  0.847  1.0
  O  O26  1  0.731  0.271  0.454  1.0
  O  O27  1  0.236  0.271  0.300  1.0
  O  O28  1  0.408  0.497  0.501  1.0
  O  O29  1  0.448  0.729  0.881  1.0
  O  O30  1  0.023  0.870  0.898  1.0
[/CIF]
.