Atomic-scale analysis of cation ordering in reduced calcium titanate

Scientific Reports
Luying LiJianbo Wang

Abstract

The phenomenon of cation ordering is closely related to certain physical properties of complex oxides, which necessitates the search of underlying structure-property relationship at atomic resolution. Here we study the superlattices within reduced calcium titanate single crystal micro-pillars, which are unexpected from the originally proposed atomic model. Bright and dark contrasts at alternating Ti double layers perpendicular to b axis are clearly observed, but show no signs in corresponding image simulations based on the proposed atomic model. The multi-dimensional chemical analyses at atomic resolution reveal periodic lower Ti concentrations at alternating Ti double layers perpendicular to b axis. The following in-situ heating experiment shows no phase transition at the reported T c and temperature independence of the superlattices. The dimerization of the Ti-Ti bonds at neighboring double rutile-type chains within Ti puckered sheets are directly observed, which is found to be not disturbed by the cation ordering at alternating Ti double layers. The characterization of cation ordering of complex oxides from chemical and structural point of view at atomic resolution, and its reaction to temperature variations are important fo...Continue Reading

References

Mar 6, 2004·Physical Review Letters·M SchmidtS W Cheong
Aug 6, 2004·Nature·David A MullerHarold Y Hwang
Sep 22, 2017·Advanced Science·Luying LiJianbo Wang

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Methods Mentioned

BETA
X-ray
scanning electron microscopy
transmission electron microscopy

Software Mentioned

JEMS
MACTEMPAS

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