Defect structure-electrical property relationship in Mn-doped calcium strontium titanate dielectric ceramics

Lin Zhang; Hua Hao; Shujun Zhang; Michael T. Lanagan; Zhonghua Yao; Qi Xu; Juan Xie; Jing Zhou; Minghe Cao; Hanxing Liu

doi:10.1111/jace.14994

Defect structure-electrical property relationship in Mn-doped calcium strontium titanate dielectric ceramics

Lin Zhang, Hua Hao, Shujun Zhang, Michael T. Lanagan, Zhonghua Yao, Qi Xu, Juan Xie, Jing Zhou, Minghe Cao, Hanxing Liu

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Abstract

Ca_0.6Sr_0.4TiO₃ (CST) ceramics with different amounts of Mn dopant (0-2.0 mol%) were prepared by solid-state reaction method. The electric field and temperature stability of energy storage performance was found to be greatly enhanced with moderate doped level of 0.5 mol%. The dielectric loss-frequency spectra revealed the existence and evolution of defect dipoles at elevated temperature, which was confirmed directly by electron paramagnetic resonance (EPR) spectra. The response of defect dipoles was characterized by thermally stimulated depolarization current (TSDC), where the activation energy and the concentration evolution of defect dipoles were calculated, with the highest values observed for 0.5% doped samples. The dissociation of defect dipoles and the movement of free V_o^̈ were analyzed by high-temperature impedance spectra analysis, with the activation energy of 1.04-1.60 eV, and 0.5% doped samples also demonstrated the highest E_a. The relationship between microscopic defect structure and macroscopic electrical behavior was established in this work.

Original language	English (US)
Pages (from-to)	4638-4648
Number of pages	11
Journal	Journal of the American Ceramic Society
Volume	100
Issue number	10
DOIs	https://doi.org/10.1111/jace.14994
State	Published - Oct 2017

All Science Journal Classification (ASJC) codes

Ceramics and Composites
Materials Chemistry

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title = "Defect structure-electrical property relationship in Mn-doped calcium strontium titanate dielectric ceramics",

abstract = "Ca0.6Sr0.4TiO3 (CST) ceramics with different amounts of Mn dopant (0-2.0 mol%) were prepared by solid-state reaction method. The electric field and temperature stability of energy storage performance was found to be greatly enhanced with moderate doped level of 0.5 mol%. The dielectric loss-frequency spectra revealed the existence and evolution of defect dipoles at elevated temperature, which was confirmed directly by electron paramagnetic resonance (EPR) spectra. The response of defect dipoles was characterized by thermally stimulated depolarization current (TSDC), where the activation energy and the concentration evolution of defect dipoles were calculated, with the highest values observed for 0.5% doped samples. The dissociation of defect dipoles and the movement of free V{\"o} were analyzed by high-temperature impedance spectra analysis, with the activation energy of 1.04-1.60 eV, and 0.5% doped samples also demonstrated the highest Ea. The relationship between microscopic defect structure and macroscopic electrical behavior was established in this work.",

author = "Lin Zhang and Hua Hao and Shujun Zhang and Lanagan, {Michael T.} and Zhonghua Yao and Qi Xu and Juan Xie and Jing Zhou and Minghe Cao and Hanxing Liu",

note = "Funding Information: This work was supported by NSFC-Guangdong Joint Funds of the Natural Science Foundation of China (No. U1601209), the National Key Basic Research Program of China (973 Program) (No. 2015CB654601), Natural Science Foundation of China (No. 51372191), the Fundamental Research Funds for the Central Universities (WUT: 2016-YB-006), and the China Scholarship Council (CSC). The author S. Zhang thanks Australian Research Council for support through Future Fellowship scheme (FT140100698). Publisher Copyright: {\textcopyright} 2017 The American Ceramic Society",

year = "2017",

month = oct,

doi = "10.1111/jace.14994",

language = "English (US)",

volume = "100",

pages = "4638--4648",

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T1 - Defect structure-electrical property relationship in Mn-doped calcium strontium titanate dielectric ceramics

AU - Zhang, Lin

AU - Hao, Hua

AU - Zhang, Shujun

AU - Lanagan, Michael T.

AU - Yao, Zhonghua

AU - Xu, Qi

AU - Xie, Juan

AU - Zhou, Jing

AU - Cao, Minghe

AU - Liu, Hanxing

N1 - Funding Information: This work was supported by NSFC-Guangdong Joint Funds of the Natural Science Foundation of China (No. U1601209), the National Key Basic Research Program of China (973 Program) (No. 2015CB654601), Natural Science Foundation of China (No. 51372191), the Fundamental Research Funds for the Central Universities (WUT: 2016-YB-006), and the China Scholarship Council (CSC). The author S. Zhang thanks Australian Research Council for support through Future Fellowship scheme (FT140100698). Publisher Copyright: © 2017 The American Ceramic Society

PY - 2017/10

Y1 - 2017/10

N2 - Ca0.6Sr0.4TiO3 (CST) ceramics with different amounts of Mn dopant (0-2.0 mol%) were prepared by solid-state reaction method. The electric field and temperature stability of energy storage performance was found to be greatly enhanced with moderate doped level of 0.5 mol%. The dielectric loss-frequency spectra revealed the existence and evolution of defect dipoles at elevated temperature, which was confirmed directly by electron paramagnetic resonance (EPR) spectra. The response of defect dipoles was characterized by thermally stimulated depolarization current (TSDC), where the activation energy and the concentration evolution of defect dipoles were calculated, with the highest values observed for 0.5% doped samples. The dissociation of defect dipoles and the movement of free Vö were analyzed by high-temperature impedance spectra analysis, with the activation energy of 1.04-1.60 eV, and 0.5% doped samples also demonstrated the highest Ea. The relationship between microscopic defect structure and macroscopic electrical behavior was established in this work.

AB - Ca0.6Sr0.4TiO3 (CST) ceramics with different amounts of Mn dopant (0-2.0 mol%) were prepared by solid-state reaction method. The electric field and temperature stability of energy storage performance was found to be greatly enhanced with moderate doped level of 0.5 mol%. The dielectric loss-frequency spectra revealed the existence and evolution of defect dipoles at elevated temperature, which was confirmed directly by electron paramagnetic resonance (EPR) spectra. The response of defect dipoles was characterized by thermally stimulated depolarization current (TSDC), where the activation energy and the concentration evolution of defect dipoles were calculated, with the highest values observed for 0.5% doped samples. The dissociation of defect dipoles and the movement of free Vö were analyzed by high-temperature impedance spectra analysis, with the activation energy of 1.04-1.60 eV, and 0.5% doped samples also demonstrated the highest Ea. The relationship between microscopic defect structure and macroscopic electrical behavior was established in this work.

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Defect structure-electrical property relationship in Mn-doped calcium strontium titanate dielectric ceramics

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