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ε-Fe 2 O 3 , a metastable phase of iron oxide, is widely known as a room-temperature multiferroic material or as a superhard magnet. Element substitution into ε-Fe 2 O 3 has been reported in the literature; however, the substituted ions have a strong site preference depending on their ionic radii and valence. In this study, in order to characterize the crystal structure and magnetic properties of ε-Fe 2 O 3 in the Fe 2+ /Fe 3+ coexisting states, Li + was electrochemically inserted into ε-Fe 2 O 3 o reduce Fe 3+ . The discharge and charge of Li + into/from ε-Fe 2 O 3 revealed that Li + insertion was successful. X-ray magnetic circular dichroism results indicated that the reduced Fe did not exhibit site preference. Increasing the Li + content in ε-Fe 2 O 3 resulted in decreased saturation magnetization and irregular variation of the coercive field. We present a comprehensive discussion of how magnetic properties are modified with increasing Li + content using transmission electron microscopy images and considering the Li + diffusion coefficient. The results suggest that inserting Li + into crystalline ε-Fe 2 O 3 is a useful tool for characterizing crystal structure, lithiation limit, and magnetic properties in the coexistence of Fe 2+ /Fe 3+ .

Modulating the Structure and Magnetic Properties of ε-Fe2O3 Nanoparticles via Electrochemical Li+ Insertion

Modulating the Structure and Magnetic Properties of ε-Fe₂O₃ Nanoparticles via Electrochemical Li⁺ Insertion