Figure 1 (IMAGE) Kobe University Caption Figure 1: STEM-EELS analysis shows iron oxide distribution and oxygen vacancies (Vo) in mesocrystals. a. EEL (Electron Energy Loss) spectra of Fe L2,3 using multivariate analysis b. Image of the spatial distribution of iron elements in and on the mesocrystals. From the high background intensity, the Fe2+ oxide is considered to be mostly located inside the mesocrystals. Vo are likely to form in the regions where neighboring nanoparticle fusion took place. Credit Kobe University 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.