Direct determination of dopant site selectivity in ordered perovskite CaCu3Ti4O12 polycrystals by aberration-corrected STEM

Si Young Choi; Sung Yoon Chung; Takahisa Yamamoto; Yuichi Ikuhara

doi:10.1002/adma.200802728

Direct determination of dopant site selectivity in ordered perovskite CaCu₃Ti₄O₁₂ polycrystals by aberration-corrected STEM

Si Young Choi, Sung Yoon Chung, Takahisa Yamamoto, Yuichi Ikuhara

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

26 Citations (Scopus)

Abstract

A direct determination of dopant site selectivity in ordered perovskite CaCu₃Ti₄O₁₂ polycrystals was reported. Scanning Transmission Electron Microscopy (STEM) with a spherical aberration corrector and Electron Energy Loss Spectroscopy (EELS) analysis were utilized for direct visualization and chemical identification of each atomic column. Image simulation was carried out before the observation of CaCu₃Ti ₄O₁₂ doped with 5% La in STEM, to predict the variations in the intensity of each atomic column by doping. Considering CaCu ₃Ti₄O₁₂ as a complex perovskite oxide showed that doped aliovalent La cations are substituted for Ca, even though 75% of A sites are composed of Cu. The results reveals that La cations are preferentially substituted for Ca sites in CaCu₃Ti₄O₁₂ indicating an ordered behavior of occupations.

Original language	English
Pages (from-to)	885-889
Number of pages	5
Journal	Advanced Materials
Volume	21
Issue number	8
DOIs	https://doi.org/10.1002/adma.200802728
Publication status	Published - 2009 Feb 23
Externally published	Yes

ASJC Scopus subject areas

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1002/adma.200802728

Cite this

@article{68a7eff48cda47fabb6a896e7343301e,

title = "Direct determination of dopant site selectivity in ordered perovskite CaCu3Ti4O12 polycrystals by aberration-corrected STEM",

abstract = "A direct determination of dopant site selectivity in ordered perovskite CaCu3Ti4O12 polycrystals was reported. Scanning Transmission Electron Microscopy (STEM) with a spherical aberration corrector and Electron Energy Loss Spectroscopy (EELS) analysis were utilized for direct visualization and chemical identification of each atomic column. Image simulation was carried out before the observation of CaCu3Ti 4O12 doped with 5% La in STEM, to predict the variations in the intensity of each atomic column by doping. Considering CaCu 3Ti4O12 as a complex perovskite oxide showed that doped aliovalent La cations are substituted for Ca, even though 75% of A sites are composed of Cu. The results reveals that La cations are preferentially substituted for Ca sites in CaCu3Ti4O12 indicating an ordered behavior of occupations.",

author = "Choi, {Si Young} and Chung, {Sung Yoon} and Takahisa Yamamoto and Yuichi Ikuhara",

year = "2009",

month = feb,

day = "23",

doi = "10.1002/adma.200802728",

language = "English",

volume = "21",

pages = "885--889",

journal = "Advanced Materials",

issn = "0935-9648",

publisher = "Wiley-VCH Verlag",

number = "8",

}

TY - JOUR

T1 - Direct determination of dopant site selectivity in ordered perovskite CaCu3Ti4O12 polycrystals by aberration-corrected STEM

AU - Choi, Si Young

AU - Chung, Sung Yoon

AU - Yamamoto, Takahisa

AU - Ikuhara, Yuichi

PY - 2009/2/23

Y1 - 2009/2/23

N2 - A direct determination of dopant site selectivity in ordered perovskite CaCu3Ti4O12 polycrystals was reported. Scanning Transmission Electron Microscopy (STEM) with a spherical aberration corrector and Electron Energy Loss Spectroscopy (EELS) analysis were utilized for direct visualization and chemical identification of each atomic column. Image simulation was carried out before the observation of CaCu3Ti 4O12 doped with 5% La in STEM, to predict the variations in the intensity of each atomic column by doping. Considering CaCu 3Ti4O12 as a complex perovskite oxide showed that doped aliovalent La cations are substituted for Ca, even though 75% of A sites are composed of Cu. The results reveals that La cations are preferentially substituted for Ca sites in CaCu3Ti4O12 indicating an ordered behavior of occupations.

AB - A direct determination of dopant site selectivity in ordered perovskite CaCu3Ti4O12 polycrystals was reported. Scanning Transmission Electron Microscopy (STEM) with a spherical aberration corrector and Electron Energy Loss Spectroscopy (EELS) analysis were utilized for direct visualization and chemical identification of each atomic column. Image simulation was carried out before the observation of CaCu3Ti 4O12 doped with 5% La in STEM, to predict the variations in the intensity of each atomic column by doping. Considering CaCu 3Ti4O12 as a complex perovskite oxide showed that doped aliovalent La cations are substituted for Ca, even though 75% of A sites are composed of Cu. The results reveals that La cations are preferentially substituted for Ca sites in CaCu3Ti4O12 indicating an ordered behavior of occupations.

UR - http://www.scopus.com/inward/record.url?scp=60849096105&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=60849096105&partnerID=8YFLogxK

U2 - 10.1002/adma.200802728

DO - 10.1002/adma.200802728

M3 - Article

AN - SCOPUS:60849096105

SN - 0935-9648

VL - 21

SP - 885

EP - 889

JO - Advanced Materials

JF - Advanced Materials

IS - 8

ER -

Direct determination of dopant site selectivity in ordered perovskite CaCu₃Ti₄O₁₂ polycrystals by aberration-corrected STEM

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this