Abstract
Lithium has been inserted into Fe 3O 4 and α-Fe 2O 3 at room temperature both chemically and electrochemically; a compositional range 0<x<2 has been established for both Li xFe 3O 4 and Li xFe 2O 3. Powder X-ray-diffraction data of Li 1.5Fe 3O 4 indicate that the [Fe 2]O 4 subarray of the spinel structure remains intact; the A-site Fe 3+ ions are displaced to empty octahedral positions and the Li + ions in excess of x = 1 are located in tetrahedral sites. Lithiation of α-Fe 2O 3 causes the anion array to transform from hexagonal to cubic close packing; in this case the Li + ions are distributed over both 16c and 16d octahedral sites of the cubic space group Fd3m.
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