CaCu3Ti4O12-type colossal dielectric relaxation in complex perovskite (Ba1-xLax)(Ti 1-xCrx)O3

Mamoru Fukunaga; Yoshiaki Uesu; Guobao Li

doi:10.1080/00150190701454719

CaCu₃Ti₄O₁₂-type colossal dielectric relaxation in complex perovskite (Ba_1-xLa_x)(Ti _1-xCr_x)O₃

Mamoru Fukunaga, Yoshiaki Uesu, Guobao Li

Faculty of Science

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

1 Citation (Scopus)

Abstract

Dielectric constants of complex perovskite oxide (Ba_1-xLa _x)(Ti_1-xCr_x)O₃ (BLTC) ceramics with 0.4≤x≤0.7 are measured, and a remarkable colossal dielectric relaxation which is quite similar to that of CaCu₃Ti₄O₁₂ (CCTO) is found in higher temperature region above the ferroelectric phase transition. This kind of dielectric relaxation is successfully explained by an equivalent circuit model of a series of two R-C parallel circuits with temperature-dependent electrical conductivity and temperature-independent intrinsic dielectric constant. It is also found that the dc bias effect on the sample can distinguish this hetero-structure model and the proper Debye relaxation model of a homogeneous phase.

Original language	English
Pages (from-to)	106-114
Number of pages	9
Journal	Ferroelectrics
Volume	354
Issue number	1
DOIs	https://doi.org/10.1080/00150190701454719
Publication status	Published - 2007

Keywords

(BaLa)(TiCr )O
CaCuTiO
Colossal dielectric relaxation
Dielectrics
Hetero-structure model

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1080/00150190701454719

Cite this

@article{0d6bf17f129d43e4ae3ea1a7094d42f4,

title = "CaCu3Ti4O12-type colossal dielectric relaxation in complex perovskite (Ba1-xLax)(Ti 1-xCrx)O3",

abstract = "Dielectric constants of complex perovskite oxide (Ba1-xLa x)(Ti1-xCrx)O3 (BLTC) ceramics with 0.4≤x≤0.7 are measured, and a remarkable colossal dielectric relaxation which is quite similar to that of CaCu3Ti4O12 (CCTO) is found in higher temperature region above the ferroelectric phase transition. This kind of dielectric relaxation is successfully explained by an equivalent circuit model of a series of two R-C parallel circuits with temperature-dependent electrical conductivity and temperature-independent intrinsic dielectric constant. It is also found that the dc bias effect on the sample can distinguish this hetero-structure model and the proper Debye relaxation model of a homogeneous phase.",

keywords = "(BaLa)(TiCr )O, CaCuTiO, Colossal dielectric relaxation, Dielectrics, Hetero-structure model",

author = "Mamoru Fukunaga and Yoshiaki Uesu and Guobao Li",

note = "Funding Information: This study was partly supported by a grant-in-aid of scientific research (A) of MEXT, a grant-in-aid for the Research and Development of New Technology from the Association of Private Universities in Japan, the 21st century COE program “Physics of systems with self-organization composed of multi-elements” of MEXT, Japan and a special grant for researches in Waseda University.",

year = "2007",

doi = "10.1080/00150190701454719",

language = "English",

volume = "354",

pages = "106--114",

journal = "Ferroelectrics",

issn = "0015-0193",

publisher = "Taylor and Francis Ltd.",

number = "1",

}

TY - JOUR

T1 - CaCu3Ti4O12-type colossal dielectric relaxation in complex perovskite (Ba1-xLax)(Ti 1-xCrx)O3

AU - Fukunaga, Mamoru

AU - Uesu, Yoshiaki

AU - Li, Guobao

N1 - Funding Information: This study was partly supported by a grant-in-aid of scientific research (A) of MEXT, a grant-in-aid for the Research and Development of New Technology from the Association of Private Universities in Japan, the 21st century COE program “Physics of systems with self-organization composed of multi-elements” of MEXT, Japan and a special grant for researches in Waseda University.

PY - 2007

Y1 - 2007

N2 - Dielectric constants of complex perovskite oxide (Ba1-xLa x)(Ti1-xCrx)O3 (BLTC) ceramics with 0.4≤x≤0.7 are measured, and a remarkable colossal dielectric relaxation which is quite similar to that of CaCu3Ti4O12 (CCTO) is found in higher temperature region above the ferroelectric phase transition. This kind of dielectric relaxation is successfully explained by an equivalent circuit model of a series of two R-C parallel circuits with temperature-dependent electrical conductivity and temperature-independent intrinsic dielectric constant. It is also found that the dc bias effect on the sample can distinguish this hetero-structure model and the proper Debye relaxation model of a homogeneous phase.

AB - Dielectric constants of complex perovskite oxide (Ba1-xLa x)(Ti1-xCrx)O3 (BLTC) ceramics with 0.4≤x≤0.7 are measured, and a remarkable colossal dielectric relaxation which is quite similar to that of CaCu3Ti4O12 (CCTO) is found in higher temperature region above the ferroelectric phase transition. This kind of dielectric relaxation is successfully explained by an equivalent circuit model of a series of two R-C parallel circuits with temperature-dependent electrical conductivity and temperature-independent intrinsic dielectric constant. It is also found that the dc bias effect on the sample can distinguish this hetero-structure model and the proper Debye relaxation model of a homogeneous phase.

KW - (BaLa)(TiCr )O

KW - CaCuTiO

KW - Colossal dielectric relaxation

KW - Dielectrics

KW - Hetero-structure model

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U2 - 10.1080/00150190701454719

DO - 10.1080/00150190701454719

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JF - Ferroelectrics

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