Direct Determination of Dopant Site Selectivity in Ordered Perovskite CaCu3Ti4O12 Polycrystals by Aberration-Corrected STEM

Abstract

Through a combination of aberration-corrected HAADF-STEM and EELS at the atomic level, it is found that added La in CaCu3Ti4O12 is selectively substituted for Ca, rather than Cu. The present study suggests that imaging based on STEM combined with EELS can be utilized as a powerful tool to reveal the atomic-level distribution of cation dopants in complex oxides.