Abstract
The reaction products of Li 2CO 3 and Fe 2O 3 have been studied by X-ray diffraction for the compositional range 0≤ Li Fe ≤0.2 . Under oxidizing conditions (750°C in air) the products were LiFe 5O 8 and Fe 2O 3. Reduction in H 2 at 450°C yielded a single, apparently cation—deficient spinel phase for 0≤ Li Fe ≤0.05 ; the spinel phase was mixed with a rocksalt phase for 0.1≤ Li Fe ≤0.2 . Further reduction (780°C in Ar in a carbon furnace) yielded Fe 3O 4 and a rocksalt phase. The spinel/rocksalt fraction extrapolates to zero at a rocksalt composition LiFe 2.5O 4. This LiFe 2.5O 4 phase, with space group Fm3m, differs from the product of room—temperature lithiation of Fe 3O 4, which retains the [Fe 2]O 4 spinel framework with space group Fd3m and so prevents a completely random distribution of Li on the octahedral sites.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
