(Li)2Fe4O7 crystallizes in the trigonal P-31m space group. The structure consists of two 7439-93-2 atoms inside a Fe4O7 framework. In the Fe4O7 framework, there are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2) and three equivalent O(1) atoms to form FeO4 trigonal pyramids that share corners with six equivalent Fe(2)O6 octahedra and  a cornercorner with one Fe(1)O4 trigonal pyramid. The corner-sharing octahedral tilt angles are 64°. In the second Fe site, Fe(2) is bonded to six equivalent O(1) atoms to form FeO6 octahedra that share corners with six equivalent Fe(1)O4 trigonal pyramids and edges with three equivalent Fe(2)O6 octahedra. There are two inequivalent O sites. In the first O site, O(2) is bonded in a linear geometry to two equivalent Fe(1) atoms. In the second O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Fe(1) and two equivalent Fe(2) atoms.
(Li)2Fe4O7 crystallizes in the trigonal P-31m space group. The structure consists of two 7439-93-2 atoms inside a Fe4O7 framework. In the Fe4O7 framework, there are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(2) and three equivalent O(1) atoms to form FeO4 trigonal pyramids that share corners with six equivalent Fe(2)O6 octahedra and  a cornercorner with one Fe(1)O4 trigonal pyramid. The corner-sharing octahedral tilt angles are 64°. The Fe(1)-O(2) bond length is 1.81 Å. All Fe(1)-O(1) bond lengths are 1.92 Å. In the second Fe site, Fe(2) is bonded to six equivalent O(1) atoms to form FeO6 octahedra that share corners with six equivalent Fe(1)O4 trigonal pyramids and edges with three equivalent Fe(2)O6 octahedra. All Fe(2)-O(1) bond lengths are 2.05 Å. There are two inequivalent O sites. In the first O site, O(2) is bonded in a linear geometry to two equivalent Fe(1) atoms. In the second O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Fe(1) and two equivalent Fe(2) atoms.