Enhanced ferroelectric relaxation behaviors of KSr2Nb5O15-based ceramics by A-site entropy-engineering

Shuyao Cao; Weiguo Wang; Gangling Hao; Lei Chen; Xiaoying Feng; Qian Chen; Jie Xu; Li Jin; Feng Gao

doi:10.1016/j.matlet.2022.132923

Enhanced ferroelectric relaxation behaviors of KSr₂Nb₅O₁₅-based ceramics by A-site entropy-engineering

Shuyao Cao, Weiguo Wang, Gangling Hao, Lei Chen, Xiaoying Feng, Qian Chen, Jie Xu, Li Jin, Feng Gao

School of Materials Sience and Engineering

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

2 Scopus citations

Abstract

A novel tetragonal tungsten bronze (TTB) structured K(Ca_0.25Sr_0.25Ba_0.25La_0.25)_1.96Sm_0.04Nb₅O₁₅ ferroelectric ceramic was prepared by an A-site entropy-engineering design. The results of Rietveld refinements of X-ray diffraction patterns showed that the A-site entropy-engineering aggravated the distortion of NbO₆ octahedrons, especially along the single polarization axis direction. The aggravated distortion of NbO₆ octahedrons and reducing of grain sizes further enhanced the ferroelectric relaxation feature, slightly strengthened the diffuseness degree, and caused the obvious frequency dependence of the dielectric phase transition around room temperature. This work provides a valuable strategy for tailoring the electric properties of tungsten bronze structured ferroelectric ceramics.

Original language	English
Article number	132923
Journal	Materials Letters
Volume	326
DOIs	https://doi.org/10.1016/j.matlet.2022.132923
State	Published - 1 Nov 2022

Keywords

Ceramics
Entropy-engineering
Ferroelectrics
Tetragonal tungsten bronze

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10.1016/j.matlet.2022.132923

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title = "Enhanced ferroelectric relaxation behaviors of KSr2Nb5O15-based ceramics by A-site entropy-engineering",

abstract = "A novel tetragonal tungsten bronze (TTB) structured K(Ca0.25Sr0.25Ba0.25La0.25)1.96Sm0.04Nb5O15 ferroelectric ceramic was prepared by an A-site entropy-engineering design. The results of Rietveld refinements of X-ray diffraction patterns showed that the A-site entropy-engineering aggravated the distortion of NbO6 octahedrons, especially along the single polarization axis direction. The aggravated distortion of NbO6 octahedrons and reducing of grain sizes further enhanced the ferroelectric relaxation feature, slightly strengthened the diffuseness degree, and caused the obvious frequency dependence of the dielectric phase transition around room temperature. This work provides a valuable strategy for tailoring the electric properties of tungsten bronze structured ferroelectric ceramics.",

keywords = "Ceramics, Entropy-engineering, Ferroelectrics, Tetragonal tungsten bronze",

author = "Shuyao Cao and Weiguo Wang and Gangling Hao and Lei Chen and Xiaoying Feng and Qian Chen and Jie Xu and Li Jin and Feng Gao",

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year = "2022",

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doi = "10.1016/j.matlet.2022.132923",

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T1 - Enhanced ferroelectric relaxation behaviors of KSr2Nb5O15-based ceramics by A-site entropy-engineering

AU - Cao, Shuyao

AU - Wang, Weiguo

AU - Hao, Gangling

AU - Chen, Lei

AU - Feng, Xiaoying

AU - Chen, Qian

AU - Xu, Jie

AU - Jin, Li

AU - Gao, Feng

PY - 2022/11/1

Y1 - 2022/11/1

N2 - A novel tetragonal tungsten bronze (TTB) structured K(Ca0.25Sr0.25Ba0.25La0.25)1.96Sm0.04Nb5O15 ferroelectric ceramic was prepared by an A-site entropy-engineering design. The results of Rietveld refinements of X-ray diffraction patterns showed that the A-site entropy-engineering aggravated the distortion of NbO6 octahedrons, especially along the single polarization axis direction. The aggravated distortion of NbO6 octahedrons and reducing of grain sizes further enhanced the ferroelectric relaxation feature, slightly strengthened the diffuseness degree, and caused the obvious frequency dependence of the dielectric phase transition around room temperature. This work provides a valuable strategy for tailoring the electric properties of tungsten bronze structured ferroelectric ceramics.

AB - A novel tetragonal tungsten bronze (TTB) structured K(Ca0.25Sr0.25Ba0.25La0.25)1.96Sm0.04Nb5O15 ferroelectric ceramic was prepared by an A-site entropy-engineering design. The results of Rietveld refinements of X-ray diffraction patterns showed that the A-site entropy-engineering aggravated the distortion of NbO6 octahedrons, especially along the single polarization axis direction. The aggravated distortion of NbO6 octahedrons and reducing of grain sizes further enhanced the ferroelectric relaxation feature, slightly strengthened the diffuseness degree, and caused the obvious frequency dependence of the dielectric phase transition around room temperature. This work provides a valuable strategy for tailoring the electric properties of tungsten bronze structured ferroelectric ceramics.

KW - Ceramics

KW - Entropy-engineering

KW - Ferroelectrics

KW - Tetragonal tungsten bronze

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U2 - 10.1016/j.matlet.2022.132923

DO - 10.1016/j.matlet.2022.132923

M3 - 文章

AN - SCOPUS:85135391394

SN - 0167-577X

VL - 326

JO - Materials Letters

JF - Materials Letters

M1 - 132923

ER -

Enhanced ferroelectric relaxation behaviors of KSr₂Nb₅O₁₅-based ceramics by A-site entropy-engineering

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Keywords

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