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Microsc Microanal. 2013 Aug;19 Suppl 5:25-8. doi: 10.1017/S1431927613012269.

Direct observation of cationic ordering in double perovskite Sr₂FeReO₆ crystals.

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  • 1Advanced Characterization and Analysis Group, Korea Institute of Materials Science, Changwon 641-831, Republic of Korea. youngchoi@kims.re.kr

Abstract

Two kinds of Sr₂FeReO₆ (SFRO) samples, pristine SFRO and Re-excess SFRO, were prepared and we visualized the local atomic structure in terms of cationic ordering in the prepared SFRO samples via high-angle annular dark-field (HAADF) scanning transmission electron microscopy (STEM). HAADF-STEM results demonstrated the high degree of cationic ordering maintains in both the pristine SFRO and Re-excess SFRO samples. On the other hand, defective structures such as antiphase boundary and Re-deficient phase were observed dominantly in the pristine SFRO, and thus the poor magnetic property in the pristine SFRO is attributed to those defective structures related with the frustrated Fe/Re ordering.

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