Probing dopant segregation in distinct cation sites at perovskite oxide polycrystal interfaces

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Although theoretical studies and experimental investigations have demonstrated the presence of space-charge-induced dopant segregation, most work has been confined largely to the crystal-free surface and some special grain boundaries, and to the best of our knowledge there has been no systematic comparison to understand how the segregation varies at different types of interfaces in polycrystals. Here, through atomic-column resolved scanning transmission electron microscopy in real polycrystalline samples, we directly elucidate the space-charge segregation features at five distinct types of interfaces in an ABO(3) perovskite oxide doped with A-and B-site donors. A series of observations reveals that both the interfacial atomic structure and the subsequent segregation behaviour are invariant regardless of the interface type. The findings in this study thus suggest that the electrostatic potential variation by the interface excess charge and compensating space charge provides a crucial contribution to determining not only the distribution of dopants but also the interfacial structure in oxides.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2017-11
Language
English
Article Type
Article
Citation

NATURE COMMUNICATIONS, v.8

ISSN
2041-1723
DOI
10.1038/s41467-017-01134-x
URI
http://hdl.handle.net/10203/228526
Appears in Collection
MS-Journal Papers(저널논문)EEW-Journal Papers(저널논문)
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