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Electron-beam-induced Spinel to Defect Rocksalt Phase Transition in MgCrMnO4

and causes of these phase transitions are largely unknown. In this contribution, we will demonstrate the formation of a spinel to rocksalt phase transition in MgCrMnO 4 nanoparticles, a potential cathode for multivalent batteries, by employing atomic-resolution imaging and electron energy loss spectroscopy. The particles are exposed to an intense electron beam (approximate dose of 10 6 e - /Å 2 ) and both the structural and electronic changes induced by the electron beam are observed. Our results show that the spinel structure is transformed to a defective rocksalt structure on the MgCrMnO 4 particle, due to the migration of the cations. Although electron irradiation is not a substitute for electrochemical cycling, these types of in-situ analyses help in understanding the possible structural transformation as a result of (de)intercalation across the cathodes.