Abstract
Three new modulated structures induced by controllable electron beam irradiation (EBI) were obtained from SrCrO3 single crystal. The crystal and electronic structures were investigated using aberration-corrected scanning transmission electron microscopy, electron energy loss spectroscopy (EELS) and ab initio calculations. The EELS results revealed that EBI induced ordered oxygen vacancies and generated modulated structures SrCrO2.5 (I4/mmm), SrCrO2.8 (C2/m) and SrCrO2.67 (C2/m) from pristine SrCrO3 (Pmm). The corresponding structural models were proposed and modified by ab initio calculations. Additionally, the electronic structures of the optimized modulated structures were further investigated.
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