Dielectric relaxation and electrical conductivity in Ca5Nb4TiO17 ceramics

Chunchun Li; Xiaoyong Wei; Liang Fang; Haixue Yan; Michael J. Reece

doi:10.1016/j.ceramint.2015.04.071

Dielectric relaxation and electrical conductivity in Ca₅Nb₄TiO₁₇ ceramics

Chunchun Li
, Xiaoyong Wei
, Liang Fang
, Haixue Yan
, Michael J. Reece

Faculty of Electronic and Information Engineering

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

16 Scopus citations

Abstract

Abstract The temperature dependence of dielectric properties and electrical conduction of Ca₅Nb₄TiO₁₇ ceramics were characterized in a broad temperature range. A dielectric anomaly with strong frequency dispersion was detected in the temperature range 700-1010°C. This dielectric relaxation could be almost removed completely by annealing in an oxidizing atmosphere. Complex impedance analysis confirmed the electrical inhomogeneity of the ceramics with different contributions from the bulk and grain boundaries. This suggests that the main mechanism for the observed relaxation is the Maxwell-Wagner polarization. ac conductivity results revealed the variation of conduction mechanism with increasing temperatures from localized hopping to long-range motion of the doubly ionized oxygen vacancies.

Original language	English
Article number	10478
Pages (from-to)	9923-9930
Number of pages	8
Journal	Ceramics International
Volume	41
Issue number	8
DOIs	https://doi.org/10.1016/j.ceramint.2015.04.071
State	Published - 1 Sep 2015

Keywords

A. Sintering
C. Dielectric properties
C. Electrical conductivity

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10.1016/j.ceramint.2015.04.071

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title = "Dielectric relaxation and electrical conductivity in Ca5Nb4TiO17 ceramics",

abstract = "Abstract The temperature dependence of dielectric properties and electrical conduction of Ca5Nb4TiO17 ceramics were characterized in a broad temperature range. A dielectric anomaly with strong frequency dispersion was detected in the temperature range 700-1010°C. This dielectric relaxation could be almost removed completely by annealing in an oxidizing atmosphere. Complex impedance analysis confirmed the electrical inhomogeneity of the ceramics with different contributions from the bulk and grain boundaries. This suggests that the main mechanism for the observed relaxation is the Maxwell-Wagner polarization. ac conductivity results revealed the variation of conduction mechanism with increasing temperatures from localized hopping to long-range motion of the doubly ionized oxygen vacancies.",

keywords = "A. Sintering, C. Dielectric properties, C. Electrical conductivity",

author = "Chunchun Li and Xiaoyong Wei and Liang Fang and Haixue Yan and Reece, \{Michael J.\}",

note = "Publisher Copyright: {\textcopyright} 2015 Elsevier Ltd and Techna Group S.r.l.",

year = "2015",

month = sep,

day = "1",

doi = "10.1016/j.ceramint.2015.04.071",

language = "英语",

volume = "41",

pages = "9923--9930",

journal = "Ceramics International",

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}

TY - JOUR

T1 - Dielectric relaxation and electrical conductivity in Ca5Nb4TiO17 ceramics

AU - Li, Chunchun

AU - Wei, Xiaoyong

AU - Fang, Liang

AU - Yan, Haixue

AU - Reece, Michael J.

PY - 2015/9/1

Y1 - 2015/9/1

N2 - Abstract The temperature dependence of dielectric properties and electrical conduction of Ca5Nb4TiO17 ceramics were characterized in a broad temperature range. A dielectric anomaly with strong frequency dispersion was detected in the temperature range 700-1010°C. This dielectric relaxation could be almost removed completely by annealing in an oxidizing atmosphere. Complex impedance analysis confirmed the electrical inhomogeneity of the ceramics with different contributions from the bulk and grain boundaries. This suggests that the main mechanism for the observed relaxation is the Maxwell-Wagner polarization. ac conductivity results revealed the variation of conduction mechanism with increasing temperatures from localized hopping to long-range motion of the doubly ionized oxygen vacancies.

AB - Abstract The temperature dependence of dielectric properties and electrical conduction of Ca5Nb4TiO17 ceramics were characterized in a broad temperature range. A dielectric anomaly with strong frequency dispersion was detected in the temperature range 700-1010°C. This dielectric relaxation could be almost removed completely by annealing in an oxidizing atmosphere. Complex impedance analysis confirmed the electrical inhomogeneity of the ceramics with different contributions from the bulk and grain boundaries. This suggests that the main mechanism for the observed relaxation is the Maxwell-Wagner polarization. ac conductivity results revealed the variation of conduction mechanism with increasing temperatures from localized hopping to long-range motion of the doubly ionized oxygen vacancies.

KW - A. Sintering

KW - C. Dielectric properties

KW - C. Electrical conductivity

UR - https://www.scopus.com/pages/publications/84930929333

U2 - 10.1016/j.ceramint.2015.04.071

DO - 10.1016/j.ceramint.2015.04.071

M3 - 文章

AN - SCOPUS:84930929333

SN - 0272-8842

VL - 41

SP - 9923

EP - 9930

JO - Ceramics International

JF - Ceramics International

IS - 8

M1 - 10478

ER -

Dielectric relaxation and electrical conductivity in Ca₅Nb₄TiO₁₇ ceramics

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Keywords

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