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

Rong Huang; Teruyasu Mizoguchi; Kenji Sugiura; Hiromichi Ohta; Kunihito Koumoto; Tsukasa Hirayama; Yuichi Ikuhara

doi:10.1063/1.3021369

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

Rong Huang, Teruyasu Mizoguchi, Kenji Sugiura, Hiromichi Ohta, Kunihito Koumoto, Tsukasa Hirayama, Yuichi Ikuhara

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

Ca-ion superstructures such as 3a×3a (hexagonal) and 2a×3a (orthorhombic) in layered Ca0.33 CoO₂ 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.

Original language	English
Article number	181907
Journal	Applied Physics Letters
Volume	93
Issue number	18
DOIs	https://doi.org/10.1063/1.3021369
Publication status	Published - 2008
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.3021369

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title = "Direct observations of Ca ordering in Ca0.33 CoO2 thin films with different superstructures",

abstract = "Ca-ion superstructures such as 3a×3a (hexagonal) and 2a×3a (orthorhombic) in layered Ca0.33 CoO2 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.",

author = "Rong Huang and Teruyasu Mizoguchi and Kenji Sugiura and Hiromichi Ohta and Kunihito Koumoto and Tsukasa Hirayama and Yuichi Ikuhara",

note = "Funding Information: The authors would like to thank Dr. Kenji Nomura and Professor Hideo Hosono for XRF measurements. A part of this study was supported by the Grant-in-Aid for Scientific Research on Priority Areas “Nano Materials Science for Atomic-scale Modification 474” from the Japanese Ministry of Education, Culture, Sports and Technology.",

year = "2008",

doi = "10.1063/1.3021369",

language = "English",

volume = "93",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

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TY - JOUR

T1 - Direct observations of Ca ordering in Ca0.33 CoO2 thin films with different superstructures

AU - Huang, Rong

AU - Mizoguchi, Teruyasu

AU - Sugiura, Kenji

AU - Ohta, Hiromichi

AU - Koumoto, Kunihito

AU - Hirayama, Tsukasa

AU - Ikuhara, Yuichi

N1 - Funding Information: The authors would like to thank Dr. Kenji Nomura and Professor Hideo Hosono for XRF measurements. A part of this study was supported by the Grant-in-Aid for Scientific Research on Priority Areas “Nano Materials Science for Atomic-scale Modification 474” from the Japanese Ministry of Education, Culture, Sports and Technology.

PY - 2008

Y1 - 2008

N2 - Ca-ion superstructures such as 3a×3a (hexagonal) and 2a×3a (orthorhombic) in layered Ca0.33 CoO2 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.

AB - Ca-ion superstructures such as 3a×3a (hexagonal) and 2a×3a (orthorhombic) in layered Ca0.33 CoO2 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.

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JF - Applied Physics Letters

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ER -

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

Abstract

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