Li7Fe7SiO16 crystallizes in the triclinic P1 space group. There are seven inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(14), one O(16), one O(4), and one O(8) atom to form LiO4 tetrahedra that share  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with two equivalent Li(5)O4 tetrahedra, corners with two equivalent Li(7)O4 tetrahedra, corners with two equivalent Fe(3)O4 tetrahedra, corners with two equivalent Fe(4)O4 tetrahedra, and corners with two equivalent Fe(7)O4 tetrahedra. In the second Li site, Li(2) is bonded to one O(11), one O(2), one O(5), and one O(9) atom to form LiO4 tetrahedra that share  a cornercorner with one Fe(3)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, corners with two equivalent Li(7)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Fe(4)O4 tetrahedra, and corners with two equivalent Fe(6)O4 tetrahedra. In the third Li site, Li(3) is bonded to one O(1), one O(10), one O(12), and one O(6) atom to form LiO4 tetrahedra that share  a cornercorner with one Fe(3)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Li(5)O4 tetrahedra, corners with two equivalent Li(6)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(5)O4 tetrahedra, and corners with two equivalent Fe(7)O4 tetrahedra. In the fourth Li site, Li(4) is bonded to one O(11), one O(15), one O(5), and one O(7) atom to form LiO4 tetrahedra that share  a cornercorner with one Fe(4)O4 tetrahedra,  a cornercorner with one Fe(5)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Fe(6)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. In the fifth Li site, Li(5) is bonded to one O(12), one O(16), one O(6), and one O(8) atom to form LiO4 tetrahedra that share  a cornercorner with one Fe(4)O4 tetrahedra,  a cornercorner with one Fe(5)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(3)O4 tetrahedra, and corners with two equivalent Fe(7)O4 tetrahedra. In the sixth Li site, Li(6) is bonded to one O(1), one O(10), one O(13), and one O(3) atom to form LiO4 tetrahedra that share  a cornercorner with one Fe(6)O4 tetrahedra,  a cornercorner with one Fe(7)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(5)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. In the seventh Li site, Li(7) is bonded to one O(14), one O(2), one O(4), and one O(9) atom to form LiO4 tetrahedra that share  a cornercorner with one Fe(6)O4 tetrahedra,  a cornercorner with one Fe(7)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Fe(3)O4 tetrahedra, and corners with two equivalent Fe(4)O4 tetrahedra. There are seven inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(13), one O(16), and one O(6) atom to form FeO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(5)O4 tetrahedra, corners with two equivalent Li(6)O4 tetrahedra, corners with two equivalent Fe(5)O4 tetrahedra, and corners with two equivalent Fe(7)O4 tetrahedra. In the second Fe site, Fe(2) 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 Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, corners with two equivalent Li(7)O4 tetrahedra, corners with two equivalent Fe(4)O4 tetrahedra, and corners with two equivalent Fe(6)O4 tetrahedra. In the third Fe site, Fe(3) is bonded to one O(12), one O(4), one O(8), and one O(9) atom to form FeO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Li(3)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(5)O4 tetrahedra, corners with two equivalent Li(7)O4 tetrahedra, corners with two equivalent Fe(4)O4 tetrahedra, and corners with two equivalent Fe(7)O4 tetrahedra. In the fourth Fe site, Fe(4) 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 Li(4)O4 tetrahedra,  a cornercorner with one Li(5)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(7)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, and corners with two equivalent Fe(3)O4 tetrahedra. In the fifth Fe site, Fe(5) is bonded to one O(10), one O(13), one O(6), and one O(7) atom to form FeO4 tetrahedra that share  a cornercorner with one Li(4)O4 tetrahedra,  a cornercorner with one Li(5)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(6)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. In the sixth Fe site, Fe(6) is bonded to one O(11), one O(15), one O(2), and one O(3) atom to form FeO4 tetrahedra that share  a cornercorner with one Li(6)O4 tetrahedra,  a cornercorner with one Li(7)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. In the seventh Fe site, Fe(7) is bonded to one O(1), one O(12), one O(16), and one O(4) atom to form FeO4 tetrahedra that share  a cornercorner with one Li(6)O4 tetrahedra,  a cornercorner with one Li(7)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(5)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, and corners with two equivalent Fe(3)O4 tetrahedra. Si(1) is bonded to one O(10), one O(11), one O(3), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Li(3)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, corners with two equivalent Li(6)O4 tetrahedra, corners with two equivalent Fe(5)O4 tetrahedra, and corners with two equivalent Fe(6)O4 tetrahedra. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded to one Li(3), one Li(6), one Fe(1), and one Fe(7) atom to form OLi2Fe2 tetrahedra that share  a cornercorner with one O(4)Li2Fe2 tetrahedra, corners with two equivalent O(12)Li2Fe2 tetrahedra, corners with two equivalent O(16)Li2Fe2 tetrahedra, corners with two equivalent O(6)Li2Fe2 tetrahedra, and corners with two equivalent O(10)Li2FeSi tetrahedra. In the second O site, O(2) is bonded to one Li(2), one Li(7), one Fe(2), and one Fe(6) atom to form OLi2Fe2 tetrahedra that share  a cornercorner with one O(4)Li2Fe2 tetrahedra, corners with two equivalent O(14)Li2Fe2 tetrahedra, corners with two equivalent O(5)Li2Fe2 tetrahedra, corners with two equivalent O(9)Li2Fe2 tetrahedra, and corners with two equivalent O(11)Li2FeSi tetrahedra. In the third O site, O(3) is bonded in a trigonal planar geometry to one Li(6), one Fe(6), and one Si(1) atom. In the fourth O site, O(4) is bonded to one Li(1), one Li(7), one Fe(3), and one Fe(7) atom to form corner-sharing OLi2Fe2 tetrahedra. In the fifth O site, O(5) is bonded to one Li(2), one Li(4), one Fe(2), and one Fe(4) atom to form OLi2Fe2 tetrahedra that share  a cornercorner with one O(8)Li2Fe2 tetrahedra, corners with two equivalent O(14)Li2Fe2 tetrahedra, corners with two equivalent O(2)Li2Fe2 tetrahedra, corners with two equivalent O(9)Li2Fe2 tetrahedra, and corners with two equivalent O(11)Li2FeSi tetrahedra. In the sixth O site, O(6) is bonded to one Li(3), one Li(5), one Fe(1), and one Fe(5) atom to form OLi2Fe2 tetrahedra that share  a cornercorner with one O(8)Li2Fe2 tetrahedra, corners with two equivalent O(1)Li2Fe2 tetrahedra, corners with two equivalent O(12)Li2Fe2 tetrahedra, corners with two equivalent O(16)Li2Fe2 tetrahedra, and corners with two equivalent O(10)Li2FeSi tetrahedra. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Li(4), one Fe(5), and one Si(1) atom. In the eighth O site, O(8) is bonded to one Li(1), one Li(5), one Fe(3), and one Fe(4) atom to form corner-sharing OLi2Fe2 tetrahedra. In the ninth O site, O(9) is bonded to one Li(2), one Li(7), one Fe(3), and one Fe(4) atom to form OLi2Fe2 tetrahedra that share  a cornercorner with one O(12)Li2Fe2 tetrahedra,  a cornercorner with one O(11)Li2FeSi tetrahedra, corners with two equivalent O(14)Li2Fe2 tetrahedra, corners with two equivalent O(2)Li2Fe2 tetrahedra, corners with two equivalent O(4)Li2Fe2 tetrahedra, corners with two equivalent O(5)Li2Fe2 tetrahedra, and corners with two equivalent O(8)Li2Fe2 tetrahedra. In the tenth O site, O(10) is bonded to one Li(3), one Li(6), one Fe(5), and one Si(1) atom to form OLi2FeSi tetrahedra that share  a cornercorner with one O(12)Li2Fe2 tetrahedra,  a cornercorner with one O(11)Li2FeSi tetrahedra, corners with two equivalent O(1)Li2Fe2 tetrahedra, and corners with two equivalent O(6)Li2Fe2 tetrahedra. In the eleventh O site, O(11) is bonded to one Li(2), one Li(4), one Fe(6), and one Si(1) atom to form OLi2FeSi tetrahedra that share  a cornercorner with one O(9)Li2Fe2 tetrahedra,  a cornercorner with one O(10)Li2FeSi tetrahedra, corners with two equivalent O(2)Li2Fe2 tetrahedra, and corners with two equivalent O(5)Li2Fe2 tetrahedra. In the twelfth O site, O(12) is bonded to one Li(3), one Li(5), one Fe(3), and one Fe(7) atom to form OLi2Fe2 tetrahedra that share  a cornercorner with one O(9)Li2Fe2 tetrahedra,  a cornercorner with one O(10)Li2FeSi tetrahedra, corners with two equivalent O(1)Li2Fe2 tetrahedra, corners with two equivalent O(16)Li2Fe2 tetrahedra, corners with two equivalent O(4)Li2Fe2 tetrahedra, corners with two equivalent O(6)Li2Fe2 tetrahedra, and corners with two equivalent O(8)Li2Fe2 tetrahedra. In the thirteenth O site, O(13) is bonded in a trigonal non-coplanar geometry to one Li(6), one Fe(1), and one Fe(5) atom. In the fourteenth O site, O(14) is bonded to one Li(1), one Li(7), one Fe(2), and one Fe(4) atom to form corner-sharing OLi2Fe2 tetrahedra. In the fifteenth O site, O(15) is bonded in a trigonal non-coplanar geometry to one Li(4), one Fe(2), and one Fe(6) atom. In the sixteenth O site, O(16) is bonded to one Li(1), one Li(5), one Fe(1), and one Fe(7) atom to form corner-sharing OLi2Fe2 tetrahedra.
Li7Fe7SiO16 crystallizes in the triclinic P1 space group. There are seven inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(14), one O(16), one O(4), and one O(8) atom to form LiO4 tetrahedra that share  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one Fe(2)O4 tetrahedra, corners with two equivalent Li(5)O4 tetrahedra, corners with two equivalent Li(7)O4 tetrahedra, corners with two equivalent Fe(3)O4 tetrahedra, corners with two equivalent Fe(4)O4 tetrahedra, and corners with two equivalent Fe(7)O4 tetrahedra. The Li(1)-O(14) bond length is 1.98 Å. The Li(1)-O(16) bond length is 1.98 Å. The Li(1)-O(4) bond length is 2.01 Å. The Li(1)-O(8) bond length is 2.02 Å. In the second Li site, Li(2) is bonded to one O(11), one O(2), one O(5), and one O(9) atom to form LiO4 tetrahedra that share  a cornercorner with one Fe(3)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, corners with two equivalent Li(7)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Fe(4)O4 tetrahedra, and corners with two equivalent Fe(6)O4 tetrahedra. The Li(2)-O(11) bond length is 2.18 Å. The Li(2)-O(2) bond length is 2.04 Å. The Li(2)-O(5) bond length is 2.01 Å. The Li(2)-O(9) bond length is 2.01 Å. In the third Li site, Li(3) is bonded to one O(1), one O(10), one O(12), and one O(6) atom to form LiO4 tetrahedra that share  a cornercorner with one Fe(3)O4 tetrahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Li(5)O4 tetrahedra, corners with two equivalent Li(6)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(5)O4 tetrahedra, and corners with two equivalent Fe(7)O4 tetrahedra. The Li(3)-O(1) bond length is 2.02 Å. The Li(3)-O(10) bond length is 2.14 Å. The Li(3)-O(12) bond length is 2.02 Å. The Li(3)-O(6) bond length is 2.02 Å. In the fourth Li site, Li(4) is bonded to one O(11), one O(15), one O(5), and one O(7) atom to form LiO4 tetrahedra that share  a cornercorner with one Fe(4)O4 tetrahedra,  a cornercorner with one Fe(5)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Fe(6)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. The Li(4)-O(11) bond length is 2.07 Å. The Li(4)-O(15) bond length is 1.95 Å. The Li(4)-O(5) bond length is 2.00 Å. The Li(4)-O(7) bond length is 1.97 Å. In the fifth Li site, Li(5) is bonded to one O(12), one O(16), one O(6), and one O(8) atom to form LiO4 tetrahedra that share  a cornercorner with one Fe(4)O4 tetrahedra,  a cornercorner with one Fe(5)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(3)O4 tetrahedra, and corners with two equivalent Fe(7)O4 tetrahedra. The Li(5)-O(12) bond length is 2.03 Å. The Li(5)-O(16) bond length is 2.02 Å. The Li(5)-O(6) bond length is 2.03 Å. The Li(5)-O(8) bond length is 2.01 Å. In the sixth Li site, Li(6) is bonded to one O(1), one O(10), one O(13), and one O(3) atom to form LiO4 tetrahedra that share  a cornercorner with one Fe(6)O4 tetrahedra,  a cornercorner with one Fe(7)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, corners with two equivalent Fe(5)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. The Li(6)-O(1) bond length is 2.00 Å. The Li(6)-O(10) bond length is 2.24 Å. The Li(6)-O(13) bond length is 1.96 Å. The Li(6)-O(3) bond length is 2.05 Å. In the seventh Li site, Li(7) is bonded to one O(14), one O(2), one O(4), and one O(9) atom to form LiO4 tetrahedra that share  a cornercorner with one Fe(6)O4 tetrahedra,  a cornercorner with one Fe(7)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, corners with two equivalent Fe(3)O4 tetrahedra, and corners with two equivalent Fe(4)O4 tetrahedra. The Li(7)-O(14) bond length is 2.02 Å. The Li(7)-O(2) bond length is 2.03 Å. The Li(7)-O(4) bond length is 2.02 Å. The Li(7)-O(9) bond length is 2.04 Å. There are seven inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(13), one O(16), and one O(6) atom to form FeO4 tetrahedra that share  a cornercorner with one Li(1)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(5)O4 tetrahedra, corners with two equivalent Li(6)O4 tetrahedra, corners with two equivalent Fe(5)O4 tetrahedra, and corners with two equivalent Fe(7)O4 tetrahedra. The Fe(1)-O(1) bond length is 1.93 Å. The Fe(1)-O(13) bond length is 1.88 Å. The Fe(1)-O(16) bond length is 1.92 Å. The Fe(1)-O(6) bond length is 1.92 Å. In the second Fe site, Fe(2) 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 Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, corners with two equivalent Li(7)O4 tetrahedra, corners with two equivalent Fe(4)O4 tetrahedra, and corners with two equivalent Fe(6)O4 tetrahedra. The Fe(2)-O(14) bond length is 1.92 Å. The Fe(2)-O(15) bond length is 1.88 Å. The Fe(2)-O(2) bond length is 1.93 Å. The Fe(2)-O(5) bond length is 1.92 Å. In the third Fe site, Fe(3) is bonded to one O(12), one O(4), one O(8), and one O(9) atom to form FeO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Li(3)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(5)O4 tetrahedra, corners with two equivalent Li(7)O4 tetrahedra, corners with two equivalent Fe(4)O4 tetrahedra, and corners with two equivalent Fe(7)O4 tetrahedra. The Fe(3)-O(12) bond length is 1.92 Å. The Fe(3)-O(4) bond length is 1.91 Å. The Fe(3)-O(8) bond length is 1.92 Å. The Fe(3)-O(9) bond length is 1.92 Å. In the fourth Fe site, Fe(4) 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 Li(4)O4 tetrahedra,  a cornercorner with one Li(5)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(7)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, and corners with two equivalent Fe(3)O4 tetrahedra. The Fe(4)-O(14) bond length is 1.91 Å. The Fe(4)-O(5) bond length is 1.92 Å. The Fe(4)-O(8) bond length is 1.92 Å. The Fe(4)-O(9) bond length is 1.93 Å. In the fifth Fe site, Fe(5) is bonded to one O(10), one O(13), one O(6), and one O(7) atom to form FeO4 tetrahedra that share  a cornercorner with one Li(4)O4 tetrahedra,  a cornercorner with one Li(5)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(6)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. The Fe(5)-O(10) bond length is 1.96 Å. The Fe(5)-O(13) bond length is 1.86 Å. The Fe(5)-O(6) bond length is 1.91 Å. The Fe(5)-O(7) bond length is 1.90 Å. In the sixth Fe site, Fe(6) is bonded to one O(11), one O(15), one O(2), and one O(3) atom to form FeO4 tetrahedra that share  a cornercorner with one Li(6)O4 tetrahedra,  a cornercorner with one Li(7)O4 tetrahedra, corners with two equivalent Li(2)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, corners with two equivalent Fe(2)O4 tetrahedra, and corners with two equivalent Si(1)O4 tetrahedra. The Fe(6)-O(11) bond length is 2.00 Å. The Fe(6)-O(15) bond length is 1.88 Å. The Fe(6)-O(2) bond length is 1.91 Å. The Fe(6)-O(3) bond length is 1.93 Å. In the seventh Fe site, Fe(7) is bonded to one O(1), one O(12), one O(16), and one O(4) atom to form FeO4 tetrahedra that share  a cornercorner with one Li(6)O4 tetrahedra,  a cornercorner with one Li(7)O4 tetrahedra, corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Li(3)O4 tetrahedra, corners with two equivalent Li(5)O4 tetrahedra, corners with two equivalent Fe(1)O4 tetrahedra, and corners with two equivalent Fe(3)O4 tetrahedra. The Fe(7)-O(1) bond length is 1.92 Å. The Fe(7)-O(12) bond length is 1.92 Å. The Fe(7)-O(16) bond length is 1.92 Å. The Fe(7)-O(4) bond length is 1.92 Å. Si(1) is bonded to one O(10), one O(11), one O(3), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Li(2)O4 tetrahedra,  a cornercorner with one Li(3)O4 tetrahedra, corners with two equivalent Li(4)O4 tetrahedra, corners with two equivalent Li(6)O4 tetrahedra, corners with two equivalent Fe(5)O4 tetrahedra, and corners with two equivalent Fe(6)O4 tetrahedra. The Si(1)-O(10) bond length is 1.67 Å. The Si(1)-O(11) bond length is 1.68 Å. The Si(1)-O(3) bond length is 1.65 Å. The Si(1)-O(7) bond length is 1.65 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded to one Li(3), one Li(6), one Fe(1), and one Fe(7) atom to form OLi2Fe2 tetrahedra that share  a cornercorner with one O(4)Li2Fe2 tetrahedra, corners with two equivalent O(12)Li2Fe2 tetrahedra, corners with two equivalent O(16)Li2Fe2 tetrahedra, corners with two equivalent O(6)Li2Fe2 tetrahedra, and corners with two equivalent O(10)Li2FeSi tetrahedra. In the second O site, O(2) is bonded to one Li(2), one Li(7), one Fe(2), and one Fe(6) atom to form OLi2Fe2 tetrahedra that share  a cornercorner with one O(4)Li2Fe2 tetrahedra, corners with two equivalent O(14)Li2Fe2 tetrahedra, corners with two equivalent O(5)Li2Fe2 tetrahedra, corners with two equivalent O(9)Li2Fe2 tetrahedra, and corners with two equivalent O(11)Li2FeSi tetrahedra. In the third O site, O(3) is bonded in a trigonal planar geometry to one Li(6), one Fe(6), and one Si(1) atom. In the fourth O site, O(4) is bonded to one Li(1), one Li(7), one Fe(3), and one Fe(7) atom to form corner-sharing OLi2Fe2 tetrahedra. In the fifth O site, O(5) is bonded to one Li(2), one Li(4), one Fe(2), and one Fe(4) atom to form OLi2Fe2 tetrahedra that share  a cornercorner with one O(8)Li2Fe2 tetrahedra, corners with two equivalent O(14)Li2Fe2 tetrahedra, corners with two equivalent O(2)Li2Fe2 tetrahedra, corners with two equivalent O(9)Li2Fe2 tetrahedra, and corners with two equivalent O(11)Li2FeSi tetrahedra. In the sixth O site, O(6) is bonded to one Li(3), one Li(5), one Fe(1), and one Fe(5) atom to form OLi2Fe2 tetrahedra that share  a cornercorner with one O(8)Li2Fe2 tetrahedra, corners with two equivalent O(1)Li2Fe2 tetrahedra, corners with two equivalent O(12)Li2Fe2 tetrahedra, corners with two equivalent O(16)Li2Fe2 tetrahedra, and corners with two equivalent O(10)Li2FeSi tetrahedra. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Li(4), one Fe(5), and one Si(1) atom. In the eighth O site, O(8) is bonded to one Li(1), one Li(5), one Fe(3), and one Fe(4) atom to form corner-sharing OLi2Fe2 tetrahedra. In the ninth O site, O(9) is bonded to one Li(2), one Li(7), one Fe(3), and one Fe(4) atom to form OLi2Fe2 tetrahedra that share  a cornercorner with one O(12)Li2Fe2 tetrahedra,  a cornercorner with one O(11)Li2FeSi tetrahedra, corners with two equivalent O(14)Li2Fe2 tetrahedra, corners with two equivalent O(2)Li2Fe2 tetrahedra, corners with two equivalent O(4)Li2Fe2 tetrahedra, corners with two equivalent O(5)Li2Fe2 tetrahedra, and corners with two equivalent O(8)Li2Fe2 tetrahedra. In the tenth O site, O(10) is bonded to one Li(3), one Li(6), one Fe(5), and one Si(1) atom to form OLi2FeSi tetrahedra that share  a cornercorner with one O(12)Li2Fe2 tetrahedra,  a cornercorner with one O(11)Li2FeSi tetrahedra, corners with two equivalent O(1)Li2Fe2 tetrahedra, and corners with two equivalent O(6)Li2Fe2 tetrahedra. In the eleventh O site, O(11) is bonded to one Li(2), one Li(4), one Fe(6), and one Si(1) atom to form OLi2FeSi tetrahedra that share  a cornercorner with one O(9)Li2Fe2 tetrahedra,  a cornercorner with one O(10)Li2FeSi tetrahedra, corners with two equivalent O(2)Li2Fe2 tetrahedra, and corners with two equivalent O(5)Li2Fe2 tetrahedra. In the twelfth O site, O(12) is bonded to one Li(3), one Li(5), one Fe(3), and one Fe(7) atom to form OLi2Fe2 tetrahedra that share  a cornercorner with one O(9)Li2Fe2 tetrahedra,  a cornercorner with one O(10)Li2FeSi tetrahedra, corners with two equivalent O(1)Li2Fe2 tetrahedra, corners with two equivalent O(16)Li2Fe2 tetrahedra, corners with two equivalent O(4)Li2Fe2 tetrahedra, corners with two equivalent O(6)Li2Fe2 tetrahedra, and corners with two equivalent O(8)Li2Fe2 tetrahedra. In the thirteenth O site, O(13) is bonded in a trigonal non-coplanar geometry to one Li(6), one Fe(1), and one Fe(5) atom. In the fourteenth O site, O(14) is bonded to one Li(1), one Li(7), one Fe(2), and one Fe(4) atom to form corner-sharing OLi2Fe2 tetrahedra. In the fifteenth O site, O(15) is bonded in a trigonal non-coplanar geometry to one Li(4), one Fe(2), and one Fe(6) atom. In the sixteenth O site, O(16) is bonded to one Li(1), one Li(5), one Fe(1), and one Fe(7) atom to form corner-sharing OLi2Fe2 tetrahedra.