Inverse Properties (IMAGE) Brown University Caption The crystal structure of Fe3O4 and Fe electrodes analyzed by RHEED (reflection high energy electron diffraction). The patterns indicate that Fe3O4 has the inverse spinel structure with the same crystal orientation of the MgO substrate, while Fe takes polycrystalline structure. Credit Kaiju et. al. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.