Decisive role of mixed-valence structure in colossal dielectric constant of LaFeO3

Wei Ni; Jianglin Ye; Youmin Guo; Chao Cheng; Zhongqin Lin; Yide Li; Hong Wang; Yi Yu; Qiuju Li; Shouguo Huang; Zongping Shao; Chunchang Wang

doi:10.1111/jace.14860

Decisive role of mixed-valence structure in colossal dielectric constant of LaFeO₃

Wei Ni, Jianglin Ye, Youmin Guo, Chao Cheng, Zhongqin Lin, Yide Li, Hong Wang, Yi Yu, Qiuju Li, Shouguo Huang, Zongping Shao, Chunchang Wang

College of Chemical Engineering

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

25 Scopus citations

Abstract

The role of mixed-valence structure in colossal dielectric constant (CDC) behavior has been investigated in LaFeO₃ ceramics by tuning the ratio of Fe²⁺/Fe³⁺ through substituting Al for Fe. The ratio of Fe²⁺/Fe³⁺ is decreased gradually from 1.0 to 0.0 by increasing the concentration of Al³⁺. Two clear-cut correlations have been found: (i) the relationship between the CDC behavior and the ratio of Fe²⁺/Fe³⁺ follows an exponential function and (ii) the activation energy of the polaron relaxation is proportional to 1/ᵋ²₀, where ᵋ₀ is the intrinsic dielectric constant. These findings underscore the role of the mixed-valence structure in CDC behavior and suggest that adjusting the mixed-valence structure through doping/alloying can be a promising strategy to achieve superior CDC behavior in transition-metal oxides.

Original language	English
Pages (from-to)	3042-3049
Number of pages	8
Journal	Journal of the American Ceramic Society
Volume	100
Issue number	7
DOIs	https://doi.org/10.1111/jace.14860
State	Published - 1 Jul 2017

Keywords

dielectric materials/properties
dielectric relaxation

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10.1111/jace.14860

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title = "Decisive role of mixed-valence structure in colossal dielectric constant of LaFeO3 ",

abstract = "The role of mixed-valence structure in colossal dielectric constant (CDC) behavior has been investigated in LaFeO3 ceramics by tuning the ratio of Fe2+/Fe3+ through substituting Al for Fe. The ratio of Fe2+/Fe3+ is decreased gradually from 1.0 to 0.0 by increasing the concentration of Al3+. Two clear-cut correlations have been found: (i) the relationship between the CDC behavior and the ratio of Fe2+/Fe3+ follows an exponential function and (ii) the activation energy of the polaron relaxation is proportional to 1/ᵋ20, where ᵋ0 is the intrinsic dielectric constant. These findings underscore the role of the mixed-valence structure in CDC behavior and suggest that adjusting the mixed-valence structure through doping/alloying can be a promising strategy to achieve superior CDC behavior in transition-metal oxides.",

keywords = "dielectric materials/properties, dielectric relaxation",

author = "Wei Ni and Jianglin Ye and Youmin Guo and Chao Cheng and Zhongqin Lin and Yide Li and Hong Wang and Yi Yu and Qiuju Li and Shouguo Huang and Zongping Shao and Chunchang Wang",

note = "Publisher Copyright: {\textcopyright} 2017 The American Ceramic Society",

year = "2017",

month = jul,

day = "1",

doi = "10.1111/jace.14860",

language = "英语",

volume = "100",

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journal = "Journal of the American Ceramic Society",

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T1 - Decisive role of mixed-valence structure in colossal dielectric constant of LaFeO3

AU - Ni, Wei

AU - Ye, Jianglin

AU - Guo, Youmin

AU - Cheng, Chao

AU - Lin, Zhongqin

AU - Li, Yide

AU - Wang, Hong

AU - Yu, Yi

AU - Li, Qiuju

AU - Huang, Shouguo

AU - Shao, Zongping

AU - Wang, Chunchang

PY - 2017/7/1

Y1 - 2017/7/1

N2 - The role of mixed-valence structure in colossal dielectric constant (CDC) behavior has been investigated in LaFeO3 ceramics by tuning the ratio of Fe2+/Fe3+ through substituting Al for Fe. The ratio of Fe2+/Fe3+ is decreased gradually from 1.0 to 0.0 by increasing the concentration of Al3+. Two clear-cut correlations have been found: (i) the relationship between the CDC behavior and the ratio of Fe2+/Fe3+ follows an exponential function and (ii) the activation energy of the polaron relaxation is proportional to 1/ᵋ20, where ᵋ0 is the intrinsic dielectric constant. These findings underscore the role of the mixed-valence structure in CDC behavior and suggest that adjusting the mixed-valence structure through doping/alloying can be a promising strategy to achieve superior CDC behavior in transition-metal oxides.

AB - The role of mixed-valence structure in colossal dielectric constant (CDC) behavior has been investigated in LaFeO3 ceramics by tuning the ratio of Fe2+/Fe3+ through substituting Al for Fe. The ratio of Fe2+/Fe3+ is decreased gradually from 1.0 to 0.0 by increasing the concentration of Al3+. Two clear-cut correlations have been found: (i) the relationship between the CDC behavior and the ratio of Fe2+/Fe3+ follows an exponential function and (ii) the activation energy of the polaron relaxation is proportional to 1/ᵋ20, where ᵋ0 is the intrinsic dielectric constant. These findings underscore the role of the mixed-valence structure in CDC behavior and suggest that adjusting the mixed-valence structure through doping/alloying can be a promising strategy to achieve superior CDC behavior in transition-metal oxides.

KW - dielectric materials/properties

KW - dielectric relaxation

UR - http://www.scopus.com/inward/record.url?scp=85017433835&partnerID=8YFLogxK

U2 - 10.1111/jace.14860

DO - 10.1111/jace.14860

M3 - 文章

AN - SCOPUS:85017433835

SN - 0002-7820

VL - 100

SP - 3042

EP - 3049

JO - Journal of the American Ceramic Society

JF - Journal of the American Ceramic Society

IS - 7

ER -

Decisive role of mixed-valence structure in colossal dielectric constant of LaFeO₃

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Keywords

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