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Direct observations of Ca ordering in Ca_0.33CoO_2 thin films with different superstructures
Huang, Rong
30658
Mizoguchi, Teruyasu
30659
Sugiura, Kenji
30660
Ohta, Hiromichi
30661
Koumoto, Kunihito
30662
Hirayama, Tsukasa
30663
Ikuhara, Yuichi
30664
Ca-ion superstructures such as sqrt(3)a×sqrt(3)a (hexagonal) and 2a×sqrt(3)a (orthorhombic) in layered Ca_0.33CoO_2 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×sqrt(3)a orthorhombic superstructure, which is consistent with the partial occupation of Ca (x=0.33) in the cation sites of x=0.5.
journal article
American Institite of Physics
2008-11-05
application/pdf
APPLIED PHYSICS LETTERS
93
181907
181907
http://hdl.handle.net/2237/11982
http://dx.doi.org/10.1063/1.3021369
0003-6951
https://nagoya.repo.nii.ac.jp/record/10164/files/ApplPhysLett_93_181907.pdf
eng
https://doi.org/10.1063/1.3021369
Copyright (2008) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.