Li2Fe(SiO3)2 crystallizes in the monoclinic C2/c space group. Li(1) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. Fe(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form distorted FeO4 tetrahedra that share corners with four equivalent Si(1)O4 tetrahedra. 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 two equivalent Fe(1)O4 tetrahedra and corners with two equivalent Si(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Li(1), 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 in a 4-coordinate geometry to two equivalent Li(1), one Fe(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to two equivalent Li(1) and two equivalent Si(1) atoms. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent Si(1) atoms.
Li2Fe(SiO3)2 crystallizes in the monoclinic C2/c space group. Li(1) is bonded in a 5-coordinate geometry to one O(3), two equivalent O(1), and two equivalent O(2) atoms. The Li(1)-O(3) bond length is 2.46 Å. There is one shorter (2.01 Å) and one longer (2.10 Å) Li(1)-O(1) bond length. There is one shorter (1.98 Å) and one longer (2.56 Å) Li(1)-O(2) bond length. Fe(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form distorted FeO4 tetrahedra that share corners with four equivalent Si(1)O4 tetrahedra. Both Fe(1)-O(1) bond lengths are 2.10 Å. Both Fe(1)-O(2) bond lengths are 2.01 Å. 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 two equivalent Fe(1)O4 tetrahedra and corners with two equivalent Si(1)O4 tetrahedra. The Si(1)-O(1) bond length is 1.63 Å. The Si(1)-O(2) bond length is 1.63 Å. The Si(1)-O(3) bond length is 1.67 Å. The Si(1)-O(4) bond length is 1.63 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Li(1), 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 in a 4-coordinate geometry to two equivalent Li(1), one Fe(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to two equivalent Li(1) and two equivalent Si(1) atoms. In the fourth O site, O(4) is bonded in a linear geometry to two equivalent Si(1) atoms.