TITLE

Direct observations of Ca ordering in Ca0.33CoO2 thin films with different superstructures

AUTHOR(S)
Huang, Rong; Mizoguchi, Teruyasu; Sugiura, Kenji; Ohta, Hiromichi; Koumoto, Kunihito; Hirayama, Tsukasa; Ikuhara, Yuichi
PUB. DATE
November 2008
SOURCE
Applied Physics Letters;11/3/2008, Vol. 93 Issue 18, p181907
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Ca-ion superstructures such as [formula] (hexagonal) and [formula] (orthorhombic) in layered Ca0.33CoO2 crystalline film, which were prepared by the reactive solid-phase epitaxy and the subsequent ion-exchange treatment, were directly distinguished by using spherical-aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The fluctuation of Ca intensities in the HAADF-STEM image indicates the existence of many Ca vacancies in the 2a×3a orthorhombic superstructure, which is consistent with the partial occupation of Ca (x=0.33) in the cation sites of x=0.5.
ACCESSION #
35279188

 

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